Abstract: A buffer amplifier to be connected to an oscillator for outputting an oscillation signal, comprising an amplifier circuit for amplifying the level of the oscillation signal and frequency selective means connected to the output terminal of the amplifier circuit, wherein the fundamental harmonic or the secondary higher harmonic of the oscillation signal is outputted by switching the frequency selective means.

Abstract: An active filter circuit (a band stop filter type or a band pass filter type) having high Q value and high efficiency and which is suitable for integration has an input signal vi inputted from the input terminal supplied to the non-inverting input terminal of the first differential amplifier. The output terminal of the first differential amplifier is connected to the non-inverting input terminal of the second differential amplifier, and the first capacitor 3 is connected between this connection line and the alternate current ground. An output of the second differential amplifier is connected to the non-inverting input terminal of the first differential amplifier via the second capacitor, the inverting input terminal of the first differential amplifier, the inverting input terminal of the second differential amplifier 4, the non-inverting input terminal of the third differential amplifier, the output terminal of the third differential amplifier and the output terminal of the active filter circuit.

Abstract: The present invention relates to an amplifier comprising a first amplification circuit (1) formed of a first transistor (10) and a second amplification circuit (2) formed of a second transistor (11), wherein a first filter (3) having a desired pass-band and a desired attenuation band is connected between the output section of the foregoing first amplification circuit (1) and the input section of the foregoing second amplification circuit (2), thereby reducing noises in the output.

Abstract: Input matching is achieved for a high-frequency range having a center frequency of 0.8 GHz by a capacitor and a coil in an input matching circuit, and input matching is achieved for a high-frequency range having a center frequency of 1.9 GHz by another coil in the input matching circuit. Output matching is achieved for a high-frequency range having a center frequency of 0.8 GHz by a capacitor and a coil in an output matching circuit, and output matching is achieved for a high-frequency range having a center frequency of 1.9 GHz by another coil in the output matching circuit.

Abstract: An amplifier (100) for amplifying signals includes a diplex filter (120) having a highpass filter (110) and a lowpass filter (115), and an amplifier circuit (205) for amplifying higher frequency signals provided by the highpass filter (110) of the diplex filter (120). Because the highpass filter (110) introduces attenuation of the higher frequency signals within a particular frequency range, the amplifier (100) also includes a gain control circuit (155) coupled to the amplifier circuit (205) for adjusting the gain of the particular frequency range. Both the diplex filter (120) and the gain control circuit (155) can reside in a plug-in module that can be inserted into and removed from the amplifier (100).

Abstract: Disclosed is a transmitter for switching and transmitting signals of plural frequency bands. For example, the signals of two frequency bands are switched and transmitted. For the transmission in a first frequency band, of transistors 104, 105 are turned off, whereby a power amplifying transistor 102 is matched by an input wide band matching circuit 101 and an output main matching circuit 103, so that the high efficiency linear amplification is accomplished. For the transmission in a second frequency band, the transistor 104 is turned on while the transistor 105 is turned off, whereby the power amplifying transistor 102 is matched by a capacitance 108 as well as the input wide band matching circuit 101 and the output main matching circuit 103, so that the high efficiency linear amplification is accomplished. An external switch for switching the matching circuits is thus unnecessary.

Abstract: An exciter matching circuit (125), interstage matching circuit (134), and harmonic filter matching circuit (140) match impedances at the input to a two-stage power amplifier (130), between the first stage (132) and the second stage (136) of the power amplifier (130), and at the output of the power amplifier (130) for more than one frequency band of interest. In a GSM/DCS dual band radiotelephone (101), the matching circuits (124, 134, 140) provide low return loss at 900 MHz when the dual band transmitter (110) is operating in the GSM mode. The harmonic filter matching circuit (140) also filters out signals at 1800 MHz, 2700 MHz, and high order harmonics. When the dual band transmitter (110) is in DCS mode, however, the matching circuits (124, 134, 140) provide a low return loss at 1800 MHz and filter out signals at 2700 MHz and harmonics of 1800 MHz.

Abstract: A high-frequency amplifier that can reduce the size, weight and price of a device that contains this high-frequency amplifier. The high-frequency amplifier has, for example, an input matching circuit of the low-pass type and an input matching circuit of the high-pass type, connected in parallel and provided at the input side or terminal of a power amplification circuit. Matching is thereby performed corresponding to either one of two kinds of transmission input signals, whose frequencies are different from each other, by the input matching circuit of the low-pass type, and by the input matching circuit of the high-pass type, respectively. Moreover, for example, an output matching circuit of the low-pass type and an output matching circuit of the high-pass type are connected in parallel and provided at the output side or terminal of the power amplification circuit.

Abstract: An amplifier having an inductive coupling (LL) via which a load (Z1) may be coupled between the two main current terminals (E,C) of a transistor (QA). A capacitive coupling (CC) is also provided between the two main current terminals (E,C). The inductive coupling (LL) and the capacitive coupling (CC) provide, between the two main current terminals (E,C), respective impedances (ZLL, ZCC). To achieve a satisfactory performance in terms of signal distortion and gain, impedances (ZLL, ZCC) are substantially equal in magnitude in at least a portion of a frequency range throughout which the amplifier provides gain. The amplifier is particularly suitable for cable-network applications.

Abstract: A narrow band-pass interferometric filter for applying a response characteristic to an input signal to produce a filtered output signal. The filter is comprised of an inverting amplifier having an amplifying input to which the input signal is applied, an inverting input and an output. Coupled between the output and the inverting input of the inverting amplifier is an interferometric processing circuit which produces a signal having a generally constant positive amplitude except for a null at a pass frequency of the response characteristic for the filter. As the inversion of the signal produced by the signal processing circuit is the response characteristic of the filter and the amplitude thereof is greater than the amplitude of the input signal, the inverting amplifier passes the input signal whenever the frequency of the input signal matches the pass frequency of the filter.

Abstract: A tunable balanced RC filter circuit of the type in which the resistors are formed as MOS transistors with variable gate voltages for tuning the filter. The MOS transistor takes the form of a series arrangement of individual MOS transistors (T1-1, T1-2, . . . , T1-N; T2-1, T2-2, . . . , T2-N) each having the same d.c. bias on its gate. The gate of each of the individual MOS transistors in the series arrangement also receives a fraction of the a.c. component of the input signal on the input terminals (IT1, IT2) of the two-port network by means of a resistor ladder (R1-1, R1-2, . . . , R1-N, R2-1, R2-2, . . . , R2-N), which is connected to the input terminals (IT1, IT2) via buffers (B1, B2). The a.c. component of the input signal is thus divided among the individual transistors in the series arrangement. In this way it is possible to use MOS transistors with a small gate voltage swing at comparatively large input voltages.

Abstract: The passband ripple of a filter arrangement, including an amplifier and a bandpass filter, is tuned to a desirable level at the expense of the output return loss of the filter arrangement. Thus, the output return loss is increased as a result of reducing the ripple. To reduce the output return loss to a desired level, a lossy network is coupled to the output of the filter. The output return loss is reduced by twice the insertion loss of the lossy network. The insertion loss of the lossy network can be compensated for by increasing the gain of the amplifier.

Abstract: A new class A/F amplifier has an filtering and matching input circuit, a summing junction, an amplifying circuit, a filtering and feedback biasing circuit, and an output filtering and matching circuit. The filtering and matching input circuit responds to a radio frequency access input signal, for providing a filtered and matched radio frequency access input signal. The summing junction responds to the filtered and matched radio frequency access input signal, and further responds to a filtering and feedback biasing signal, for providing a summed, filtered, matched and feedback radio frequency access input signal. The amplifying circuit responds to the summed filtered, matched and feedback radio frequency access input signal, for providing an amplified, summed, filtered, matched and feedback radio frequency access input signal.

Abstract: An amplifier and a portable telephone apparatus using the same in which a resonance circuit is provided for each of different frequencies and bypass capacitors of the ground terminal of a transistor are properly switched according to the different frequencies. Two capacitors connected to each other in series for the parallel resonance circuits to be connected to the output terminal of the amplifying transistor are used for the resonance capacitors for the higher frequency. For the lower frequency, one of the tow capacitors that is on the ground side is used as a bypass capacitor that grounds the ground terminal of the transistor in a high frequency manner, the other capacitor being functioned as a resonance capacitor at that frequency.

Abstract: There is provided an electrical power amplifier device in which an output voltage amplitude is increased without generating any problems such as a reduction of gain, an increasing of loss and providing a large-sized device. The electrical amplifier device of the present invention is operated such that a bias point and a gradient of a load line are set as follows. That is, in the electrical power amplifier device of the present invention, a bias point of a source-grounded field-effect transistor is set to a point where a drain bias current is higher than that of the class A bias point. In addition, in the electrical power amplifier device of the present invention, a gradient of a load line is set to have a relation of a first voltage V.sub.1 >a second voltage V.sub.2. In this case, the first voltage V.sub.1 is a voltage obtained by subtracting a power supply voltage V.sub.dd from a voltage attained at a crossing point between the load line and the voltage axis. In addition, the second voltage V.sub.

Abstract: An amplifier especially suitable for use as a reading-head amplifier in a disc drive employing a magnetoresistive sensor. The amplifier is capable of injecting a fixed current into the magnetoresistive sensor and of providing an output signal dependent on the voltage developed across the magnetoresistive sensor as the resistance of the sensor varies in accordance with its magnetic environment.

Abstract: In a device comprising an amplifier with short circuit protection, and a resistor-capacitor (RC) filter connected to the amplifier output, an inductor is arranged in parallel with the filter resistor to protect the resistor.

Abstract: A compensated, bias-dependent signal filtration and amplification circuit includes a low-pass RC filter with a bias-dependent frequency response caused by the use of MOS transistors connected as capacitors with bias-dependent capacitances. A dc current source is used, in cooperation with the resistors of the RC filter, to generate a fixed bias for the capacitor-connected MOS transistors and thereby eliminate the bias dependencies of the capacitances. Following amplification of the filtered signal, another dc current is subtracted out from the amplified output signal so as to eliminate any residual dc signal components due to the input compensation dc bias signal, thereby leaving only the amplified filtered ac signal components.

Abstract: An RF amplifier has multiple DC coupled gain stages which generate an output signal by amplifying an input RF signal. All of the transistors are NPN and directly coupled through filters. The amplifier input and output stages actively match the impedance of the RF source and load.

Abstract: A microwave and millimeter wave circuit includes an amplifier having an amplification center frequency, input and output terminals, and a source-grounded transistor. First and second transmission lines are connected between the input terminal and a gate of the transistor, and are connected in series to each other. Third and fourth transmission lines are connected between a drain of the transistor and the output terminal, and are connected in series to each other. A first band elimination filter is connected to the input terminal, and has a first stopping frequency, and a second band elmination filter is connected to the output terminal, and has a second stopping frequency. A third band elimination filter is connected to a connecting point between the first and second transmission lines and has a third stopping frequency, and a fourth band elimination filter is connected to a connecting point between the third and fourth transmission lines and has a fourth stopping frequency.

Abstract: A tuned amplifier that can be produced easily in an integrated circuit and by which the tuning frequency and the maximum damping are arbitrarily adjusted without mutual interference.

Abstract: The invention relates to a distributed amplifier for wide band hyperfrequency signals of the type comprising:a plurality of basic amplifying cells (C.sub.1 to C.sub.n) mounted in series, with at least one common drain line (Ld) and at least one common grid line (Lg), each cell comprising at least one field effect transistor (T.sub.1) which is common-source mounted and filtering elements,first biasing means for applying a first biasing voltage (Vd) to the common drain line, andsecond biasing means for applying a second biasing voltage to the common grid line. According to the main feature of the invention, the first biasing means comprise a plurality of auxiliary field effect transistors (T'.sub.1 to T'.sub.n) functioning in saturable load mode and whose respective sources (S'.sub.1 to S'.sub.n) are distributively connected up to the common drain line (Ld) and whose respective drains (D'.sub.1 to D'.sub.n) receive in series the first biasing voltage (Vd).

Abstract: Various circuit techniques to implement continuous-time filters with improved performance are disclosed. The present invention uses RMC type integrators that exhibit lower harmonic distortion. In one embodiment, a novel high-gain two-pole operational amplifier is used along with RMC architecture to achieve lower harmonic distortion. In another embodiment, the present invention uses dummy polysilicon resistors to accurately compensate for the distributed parasitics of the polysilicon resistors used in RMC integrator. In yet another embodiment, the present invention provides an on-chip tuner with a differential architecture for better noise immunity.

Abstract: A matched filter with reduced electric power consumption is disclosed. The matched filter circuit power consumption is reduced by stopping the electric power supply to an unnecessary circuit since input signal is partially sampled just after an acquisition. Since the spreading code is 1 bit data string, the input signal sampled and held is branched out into the signal groups "1" and "-1" by a multiplexer. The signals in each groups are added in parallel by a capacitive coupling, and the electric power is supplied in the circuit intermittently.

Abstract: A filter circuit comprises three stages 260, 270, 280, each having a differential input and a differential output. The output of stage 260 serves as the input of stage 270 and the output of stage 270 serves as the input of stage 280 respectively. Stage 260 comprises two transistor pairs 201, 202 and 203, 204. An input signal is applied to the base electrodes of transistors 201, 204 which causes a current change in their opposite transistor 202, 203. Transistors 202, 203 have their respective base and collector electrodes connected together. The collector electrodes of transistors 202, 203 constitute the output of stage 260. Stages 270 and 280 have essentially the same structure as stage 260. The arrangement offers high frequency capabilities from a low supply voltage. In another embodiment, a cut-off frequency is varied under control of controllable current sources.

Abstract: A high-pass filter includes at least one circuit unit constituted by a first branch and a second branch both connected to an input of the filter on one side and, on the other side, to an adder the output of which is the output of the filter. The first branch includes means for transferring an input signal substantially without modifying its frequency content, and the second branch comprises a low-pass filter. The circuit elements are chosen such that the components of the input signal with frequencies below the cut-off frequency of the low-pass filter are substantially cancelled out at the output of the adder. The filter is suitable for being produced within a particularly small area in an integrated circuit.

Abstract: The receiver includes a ceramic filter which is connected to the output side of a mixer circuit for limiting a band, an intermediate frequency amplifying circuit cascade connected to the output side of the ceramic filter in a plurality of intermediate frequency amplifying stages, and a plurality of passive band-pass filters connected between the respective intermediate frequency amplifying stages of the intermediate frequency amplifying circuit. Thereby, the receiver is able to reduce the size and costs thereof.

Abstract: An audio amplifier (20) which includes an arrangement (300) for influencing an audio signal applied to the audio amplifier (20). This arrangement (300) has an amplifier for additionally amplifying a high-frequency range of the audio signal relative to the rest of the audio signal. This additional amplification takes place once a value of the audio signal has exceeded a limit value. The additional amplification only takes place for a brief period of time. The audio amplifier additionally amplifies high-frequency peaks in the audio signal for a brief period of time. The rising and falling slopes of these peaks are briefly enlarged as a result. Especially for pop music, this appears to be an attractive effect.

Abstract: An active quadrature power splitter having low power consumption is small in size and is inexpensive, for obtaining two output signals of which the phase difference is 90 degrees. Since the active quadrature power splitter operates as a microwave amplifier for obtaining two amplified microwave outputs having an equal magnitude and a phase difference of 90 degrees by using a matching circuit of the amplifier, a power gain can be obtained. Also, since a single FET or HBT is used and two output signals are generated in an output impedance matching circuit, the circuit becomes simplified. Therefore, the circuit can be easily implemented in a monolithic microwave IC and the chip size can be reduced.

Abstract: A method and amplifier circuit (20) for conditioning a signal. The amplifier circuit (20) includes a field effect transistor (22) having a sub-harmonic termination (21) connected to a drain of the field effect transistor (22). In addition, an output impedance termination (24) is connected to the drain of the field effect transistor (22) and an input impedance termination (23) is connected to the gate of the field effect transistor (22). The sub-harmonic termination (21) reduces a non-linear component of an interference signal.

Abstract: A filter circuit and an electronic apparatus using the filter circuit in which the manufacturing process can be simplified and the circuit is reduced in its size, and the minimum operating voltage is increasingly lowered and dynamic range is expanded comparing to that of prior art. A capacitor C taking out a signal component in a predetermined band from both ends is connected in series to a first diode, which is constantly in a conducting state by a second current source for diode, of a first differential pair to which the input signal of one differential input signal is supplied, and a second diode, which is constantly in a conducting state by a fourth current source for diode, of a second differential pair to which the other input signal is supplied.

Abstract: A pre-emphasis network used in a television signal jamming encoder has a variable gain tuned amplifier first stage and an attenuable notch filter and variable gain broadband amplifier second stage. The notch filter is tuned to a center frequency above the television signal intermediate frequency's visual carrier frequency resulting in 15 dB of increased pre-emphasis and a time delay which compensates for a time delay imparted by a decoding network upon decoding of a signal jammed by this encoder.

Abstract: A circuit arrangement which has a controllable transmission characteristic between a signal input (2) and a signal output (5) for a signal within a given transmission frequency band, the circuit arrangement having a bass control stage (1) to which the signal from the signal input (2) can be applied for adjustably boosting the amplitude-frequency response of the signal at low frequencies of the transmission frequency band. A higher flexibility and an improved transmission characteristic of such a circuit arrangement are obtained with a simplified construction by a notch filter stage (3), to which the signal processed in the bass control stage (1) can be applied for attenuating the amplitude-frequency response of the signal at mid-frequencies of the transmission frequency band independently of the bass control stage (1) and by which the signal thus processed can be applied to the signal output.

Abstract: A differential output type filter circuit comprises, between its input terminal and differential output terminal, a reference voltage generator circuit which receives supply voltage Vcc and outputs a reference voltage, an SVR correction circuit which filters out the noise component superposed on said reference voltage, an n-order filter circuit which functions to filter out the noise of an input signal corresponding to the input of this applied signal, this n-order filter circuit being composed of a first-stage primary filter circuit 3 and an (n-1)-order filter circuit 4, and a post-amplifier circuit 5 which receives and differentially amplifies the output signal from the SVR correction circuit and output signal 105 from said n-order filter circuit. This configuration represents a so-called single-signal input type filter circuit, and features compactness and excellent SVR characteristics.

Abstract: A filter circuit having a signal input terminal and a signal output terminal includes a first and a second buffer. The first buffer has an input end connected to a first resistor and to a first capacitor. A second capacitor having one end is connected to an output end of the first buffer. A second resistor having one end is connected to the signal input terminal. The second buffer has an input end connected to the other end of the second resistor and to the other end of the second capacitor, and an output end connected to the signal output terminal. The filter circuit also includes a first signal supply circuit and a second signal supply circuit. The first signal supply circuit supplies a signal proportional to a difference between an output signal of the second buffer and a signal inputted from the signal input terminal, to the input end of the first buffer through the first resistor.

Abstract: A differential amplifier filter with two channels in phase opposition, wherein each channel includes the same network of passive components which includes two impedances coupled in series between a first input terminal of the filter and a corresponding input of the differential amplifier, a feed-forward impedance coupled between a common node of the two series impedances and an output of the same channel of the differential amplifier, and a feedback impedance coupled between a second input of the differential amplifier and an output of the other channel of the differential amplifier.

Abstract: There is provided an active filter, having a first high-pass filter for receiving an input signal, performing filter processing of the input signal, and outputting a first signal, a second high-pass filter, an input terminal of which is connected to an output terminal of said first high-pass filter, and which receives the first signal, performs filter processing, and outputs a second signal, a differential amplifier, one input terminal of which is connected to an output terminal of said second high-pass filter to receive the second signal, the other input terminal of which is connected to the output terminal of said first high-pass filter to receive the first signal, and which outputs a third signal obtained by multiplying a difference between the first and second signals with a gain, and an adder for receiving and adding the third signal output from said differential amplifier and the input signal, and outputting a sum signal.

Abstract: A reduced phase-shift nonlinear filter includes linear filter logic 10 responsive to a filter input signal x and having a linear transfer function G(s), which provides a linear filtered signal g, zero-cross sample-and-hold logic 16 responsive to the filter input signal x and the linear filtered signal g, which provides a square wave signal n which crosses zero at the same time and in the same direction as the filter input signal x and has an amplitude proportional to the value of the linear filtered signal g at that time, complementary filter logic 20 responsive to said square wave signal n and having a complementary transfer function (1-G(s)) which provides a complementary filtered signal c, and a summer 30 which adds the complementary filtered signal and the linear filtered signal to provide a filter output signal y which exhibits less phase shift over certain frequency bands than that of the linear transfer function.

Abstract: An input radio frequency signal to be amplified is fed to the gate terminals of parallel field effect power transistors through impedance matching networks that comprise parallel resistor-capacitor combinations. The capacitor is selected so that it is self-resonant at the frequency of operation, thereby preventing attenuation of the input signal at that frequency. A shunt resistor is coupled between the gates of the parallel transistors to eliminate odd mode oscillations.

Abstract: An amplifier circuit (204) having a variable bandwidth comprises an amplifier (300), a capacitive element (304), a first npn transistor (302), and a switch control circuit (306). The first npn transistor (302) has a base coupled to an output terminal (205) of the amplifier (300), a collector coupled to a first reference voltage (113), and an emitter coupled to the capacitive element (304) and the switch control circuit (306). When the first npn transistor (302) is switched off by the switch control circuit (306), a first cutoff frequency is determined by a maximum operating frequency of the amplifier (300). When the first npn transistor (302) is switched on by the switch control circuit (306), a second cutoff frequency is determined by a capacitance of the capacitive element (304). For high frequency operation, the amplifier (300) includes at least a second npn transistor for amplification and the first cutoff frequency is determined by a Miller capacitance of the amplifier circuit (204).

Abstract: A balanced current amplifier mirrors either a fully differential or single ended input signal into common output circuits in a manner to generate a fully differential output signal without any d.c. bias. Input signal nodes are maintained at a desired voltage by circuit elements other than those of the current mirror circuits, thus freeing the current mirroring elements from having to be sized for this purpose. The sizes of the output transistors are adjustable in order to set the gain of the circuit. In addition to amplifier circuits, a full-wave rectifier, a comparator, and a filter, all operating with current signals, are described. A single circuit module may include all of these circuits with a user provided the capability to program the module to perform any one or more of these functions.

Abstract: In a high frequency amplifying circuit, an impedance matching circuit has an impedance matching inductance, and a switching diode connected in parallel with the inductance. The diode is selectively opened or closed in accordance with the input level, thereby changing an impedance matching condition. When the input level is low, an amplified output is produced by impedance matching which is implemented by the inductance itself. When the input level increases up to a level nearly causing saturation to occur, the diode is opened and rendered conductive with the result that the impedance matching characteristic changes. As a result, a phase characteristic is prevented from being deteriorated by a changed in input level.

Abstract: A broadband amplifier includes an amplifier device and input and output networks formed of microstrips. The impedance of the output microstrip is chosen by taking the geometric mean of the real parts of one of the scattering parameters of the amplifier device, at the lower and upper limits of the frequency range of interest, and by taking the geometric mean of the system impedance with the result obtained previously. The final result of these calculations is the impedance of the output network. The impedance of the input network is made to be at least twice, and preferably twice, the impedance of the output network. The amplifier is also provided with a slope compensation circuit. It has been discovered that an amplifier designed in this manner exhibits remarkable flatness over a five-octave range. The amplifier circuit is therefore suitable for use in cable television and other broadband telecommunications applications, where the frequency range of interest may be 30 MHz to 1000 MHz.

Abstract: A differential amplifier is connected to a push-pull-type source follower circuit that receives biphase signals. The source follower circuit has a first set of FETs including a first source follower FET and a first current source FET and a second set of FETs including a second source follower FET and a second current source FET. A first coupling capacitance element connects the first current source FET and the second source follower FET, and a second coupling capacitance element connects the second current source FET and the first source follower FET. A diode or a resistor connects the source terminals of the first and second current source FETs to a voltage source.

Abstract: A device for connecting an external sound generator having a plug and being incorporated in an apparatus having a circuit outputting an electrical sound signal. The external sound generator is, for instance, either one of a headphone having the plug of 3-pole stereophonic type or a earphone having the plug of 2-pole monophonic type. The device comprises a single jack having a first and second plus contacts and a minus contact for receiving the electrical sound signal from the outputting circuit through the first plus contact and for supplying the electrical sound signal to the plug connected to the jack and an impedance element, such as a electric resistor, connected between the first and second plus contacts. The impedance element prevents a short circuit for use of an earphone having a 2-pole monophonic plug.

Abstract: An amplifier for providing a pole/zero compensated output signal by generating multiple pole/zero pairs at predetermined increasing frequencies, with the number of pole/zero pairs occurring at the increasing frequencies increasing geometrically. The amplifier includes three amplifier circuits cascaded in series to generate a first pole/zero pair at a predetermined frequency, and a second and a third pole/zero pair both generated at a second frequency two octaves above the first pole/zero pair. The first amplifier circuit configured to generate the first pole/zero pair and the second and third amplifier circuits each configured to generate the second and third pole/zero pairs. The relative spacing between each pole and its corresponding zero determines the amount of compensation performed.

Abstract: An integrated circuit includes an amplifier for amplifying input electric power having a predetermined frequency determined depending on an application and a series capacitor connected to an output side of the amplifier and becoming a conductive state with respect to the electric current having the predetermined frequency but an open state with respect to the electric current having a frequency that is an odd multiple of the predetermined frequency. In the integrated circuit, the frequency that is the odd multiple thereof is processed by only the capacitor.

Abstract: A preamplifier and pre-emphasis network is provided having a differential plifier exhibiting common mode noise rejection. The preamplifier is particularly suited for use with a double-sided sensor element and it includes a double-sided, balanced calibration circuit. First and second variable gain buffers are joined to the differential amplifier for preventing current noise degradation at the differential amplifier inputs. A pre-emphasis network is further provided in conjunction with the variable gain buffers for providing balanced differential gain of the sensor element signal. Further elements of the invention provide for high and low pass filtering, and differential buffering of the output signal.

Abstract: A system for increasing the power efficiency of a balanced amplifier driven antenna arrangement includes a push-pull class B power amplifier circuit which is responsive to a periodic, time varying input signal and generates at least two output signals in response thereto. The arrangement also includes a balanced antenna exhibiting a relatively high impedance at the second harmonic of the input signal. The arrangement further includes at least one transmission line operatively coupled between the power amplifier circuit and the balanced antenna to provide the at least two output signals to the balanced antenna. The at least one transmission line has a length which is one-eighth of the wavelength of the input signal or odd multiples thereof, and thereby reflects back to the power amplifier circuit a substantially short circuit at the second harmonic of the input signal.

Abstract: Electronics for use in Coriolis and other sensors for reducing errors in the sensor output signal. An off-frequency drive scheme includes a frequency translation circuit in the excitation feedback loop of a sensor system to suppress components of the sensor drive signal at a predetermined frequency so that coupling of the drive signal to the sensor output signal can be readily removed by conventional filtering techniques. An amplifier circuit having a bandpass circuit in cascade with the forward loop gain is provided, with the bandpass circuit having a transfer function approximating one plus a bandpass characteristic, the passband of which corresponds to the information band. This arrangement increases the open-loop gain of the amplifier circuit around the information frequency without affecting the open-loop gain at DC and crossover so as to reduce phase and gain errors around the information frequency. A quadrature hulling system is provided for an in-plane micromechanical gyroscope.