Abstract: A multi-band transceiver has a function of sharing transmitted and received signals of multiple frequency bands by the same antenna. The multi-band transceiver mounts multiple filters that correspond to the multiple frequency bands and multiple amplifiers for amplifying the transmitted signals on the same substrate, and arranges the multiple filters in close vicinity to the amplifier in the order where the multiple filters are excellent in their temperature characteristic.

Abstract: Disclosed are embodiments of an integrated circuit device adapted to selectively amplify one of multiple received input signals. The device incorporates at least two first stage transistors and a single second stage transistor. The first stage transistors are adapted to receive input signals from the same or different input signal sources and are each electrically coupled to the second stage transistor. By coupling the first stage transistors to the second stage transistor, multiple low noise cascode amplifiers are formed within the same device. Each of these cascode amplifiers can be tuned to the same or different frequencies for noise figure and gain. A control circuit is adapted to individually turn on a selected first stage transistor in conjunction with the second stage transistor, thereby activating a corresponding one of the cascode amplifiers and allowing the input signal received by the selected first stage transistor to be separately amplified.

Abstract: It is an object of this invention to provide a high-frequency amplifier which can efficiently amplify an input signal in a plurality of different frequency bands in a simple configuration. The high-frequency amplifier is configured such that an RF signal having n frequencies (f1>f2 . . . >fn) applied to the amplifier is converted by an impedance conversion circuit to a higher impedance than the output impedance of the amplifier, and is branched into the highest frequency f1 and lower frequencies lower than that by a high-pass filter and a low-pass filter. Frequency f1 passes high-pass filter 31, and is thereby converted to 50 ohms. The frequencies lower than frequency f1 filtered by the low-pass filter are converted to a high impedance by an impedance conversion circuit, and are branched into the second highest frequency f2 and lower frequencies by high-pass filter 32 and low-pass filter 42.

Abstract: A power amplifier includes an amplification circuit, an input stage matching circuit, and an output stage matching circuit. The amplification circuit amplifies an input signal in each frequency band by an active element common to the signals in plural types of frequency bans, and outputs the amplified signal. The input stage matching circuit is disposed on an input side of the active element, and performs an impedance-matching between an output impedance of a circuit which supplies the signals of the plural types of frequency bands and an input impedance of the active element. The output stage matching circuit is disposed on an output side of the active element, and performs an impedance-matching between an input impedance of a circuit which receives the signals of the plural types of frequency bands outputted from the active element and an output impedance of the active element.

Abstract: Power amplifier circuits which constitute an RF power module used for a digital device capable of handling high frequency signals in two frequency bands are disposed over the same IC chip. The power amplifier circuits are disposed around the IC chip, and a secondary circuit is disposed between the power amplifier circuits. Thus, the power amplifier circuits are provided within the same IC chip to enable a size reduction. Further, the distance between the power amplifier circuits is ensured even if the power amplifier circuits are provided within the same IC chip. It is therefore possible to suppress the coupling between the power amplifier circuits and restrain crosstalk between the power amplifier circuits.

Abstract: In a transmission power amplifier apparatus, a signal calculator divides an input signal into a plurality of N constant amplitude signals having a substantially identical predetermined constant amplitude value and having predetermined phases different from each other, and N power amplifiers amplify electric powers of the N constant amplitude signals under same predetermined operating condition. A power combiner combines the electric powers of the N power-amplified constant amplitude signals, and outputs a combined output signal. A controller controls the signal calculator to detect an amplitude value of the input signal, to detect an average value and one of a maximum value of the amplitude value of the input signal and a peak-to-peak value of the amplitude value for a unit time interval based on the detected amplitude value of the input signal, and to divide the input signal into the N constant amplitude signals having a constant amplitude value and different phases.

Abstract: An embodiment of an amplifier circuit comprising a succession of amplification stages having at least a first amplification stage receiving a first signal and a second amplification stage downstream of the first amplification stage; a stage of unity gain capable of receiving the first signal and of providing a second signal corresponding to the low-impedance copy of the first signal; and a third amplification stage having its input connected to the output of the stage of unity gain by a capacitor and having its output connected to the output of the second amplification stage.

Abstract: A multiband amplifier for a test and measurement instrument includes a splitter to split an input signal into split signals, amplifiers, and means for combining and digitizing the amplified signals into a digitized signal. Each amplifier is configured to amplify an associated split signal over an amplifier passband. The amplifier passband of at least one amplifier is different from the amplifier passband of another amplifier.

Abstract: There is provided with an amplifying device including: an input terminal configured to input an input signal; first to ith blocks including first to ith resonators having different first to ith resonance frequencies and first to ith amplifiers that amplify signals which have passed through the first to ith resonators; a divider configured to divide the input signal for the first to ith resonators; a combination section configured to combine the signals which have passed through the first to ith blocks to obtain a combined signal; and an output terminal configured to output the combined signal, wherein a jth (j: an integer between 1 and i?1) block includes a phase adjustment section which provides an output signal of the jth block with a phase difference within a range of {(180±30)+(360×n)} degrees (n: an integer of 0 or greater) from an output signal that passes through a (j+1)th block.

Abstract: A technique is provided for achieving reduction in size of an electronic device with a power amplifier circuit, while enhancing the performance of the electronic device. An RF power module for a mobile communication device includes first and second semiconductor chips, a passive component, and first and second integrated passive components, which are mounted over a wiring board. In the first semiconductor chip, MISFET elements constituting power amplifier circuits for the GSM 900 and for the DCS 1800 are formed, and a control circuit is also formed. In the first integrated passive component, a low pass filter circuit for the GSM 900 is formed, and in the second integrated passive component, a low pass filter circuit for the DCS 1800 is formed. In the second semiconductor chip, antenna switch circuits for the GSM 900 and DCS 1800 are formed. Over the upper surface of the wiring board, the second semiconductor chip is disposed next to the first semiconductor chip between the integrated passive components.

Abstract: A method of processing an input broadband signal in RF circuitry includes extracting low-frequency components from the input broadband signal, processing the low-frequency components in low-frequency bypass circuitry, and adding the processed low-frequency components to the output of the RF circuitry to produce a combined output signal. Low-frequency bypass amplifier circuitry for bypassing RF circuitry includes a capacitor having a first terminal for receiving an input signal and a second terminal for connecting to an input of the RF circuitry, and a differential amplifier having two inputs respectively connected to the two terminals of the capacitor, and an output connected to an output of the RF circuitry. High-frequency components of the input signal pass through the capacitor and the RF circuitry, and low-frequency components pass through the differential amplifier and are added to the output of the RF circuitry to produce a combined output signal.

Abstract: A power amplifier arrangement comprises a power amplifier in a semiconductor body. At least one first input terminal on the surface of the semiconductor body is provided for feeding in a signal to be amplified. A first output tap of the arrangement is designed for outputting a signal with a first center frequency; a second and a third output tap are designed for outputting a second signal with a second center frequency. A line wire is respectively connected to the second and third output taps on the surface of the semiconductor body. According to the invention, a charge store is provided, which is coupled to the third output tap and is designed for forming a series resonant circuit with the line wire connected to the third output tap.

Abstract: A multi-band power amplifier module includes a first power amplifier that amplifies a first input radio frequency signal in a first frequency band in response to a first bias control signal. A second power amplifier amplifies a second input radio frequency signal in a second frequency band in response to a second bias control signal. A first bias control circuit produces the first bias control signal and a second bias control circuit produces the second bias control signal in response to step gain signals received at a step gain terminal. The module has first and second rows of pins oppositely positioned on the module and coupled to the first and second power amplifiers and first and second bias circuits.

Abstract: A circuit and method for electronically tuning an RF power amplifier. The output filter includes at least one electronically variable reactance. The electronically tuned power amplifier may be tuned rapidly to a selected frequency, to a selected impedance, or to produce a selected output amplitude. An optional controller translates frequency, impedance, or modulation inputs into tuning signals. High-efficiency, wideband amplitude modulation is produced by varying the amplifier load impedance along preferred loci.

Abstract: An amplifier circuit comprises a first operational transconductance amplifier (OTA) has an input that communicates with the output of the first amplifier. A third amplifier has an input that communicates with the input of the first amplifier and an output. A fourth OTA has an input that communicates with the output of the third amplifier and an output. A feedback resistance communicates with the input and the output of the fourth OTA. A capacitance communicates with the output of the fourth OTA and with the input of the second OTA.

Abstract: Apparatus, methods and articles of manufacture for multiband transmitter power amplification are provided wherein one or more amplifying devices, of which at least one may be one or more current sources, have impedances matched for different input and output frequencies by way of various impedance matching circuits.

Abstract: A method and apparatus are provided for enabling a transmitter to have a substantially linear magnitude response and a substantially linear phase response. The transmitter includes first and second programmable gain amplifiers (PGAs). The first PGA is tuned to have a resonant frequency that is less than an operating frequency of the first PGA. The second PGA is tuned to have a resonant frequency that is greater than an operating frequency of the second PGA. A magnitude response at an output of the first PGA and a magnitude response at an output of the second PGA combine to provide a substantially linear magnitude response across a frequency range that includes the operating frequency of the first or second PGA. According to an embodiment, the first and second PGAs have the same operating frequency.

Abstract: An apparatus and method for transmitting signal, the apparatus comprising a front end telecommunications module including a power amplifier, a matching circuit coupled to the power amplifier, and a filter coupled to the matching circuit, such that a signal received by the power amplifier is transmitted to the filter through the matching circuit. The telecommunications module provides quad-band capability in a compact design.

Abstract: A power amplifier includes amplifier elements to amplify input signals of different frequencies. The amplifier also includes a power supply circuit that includes a common power supply path including an end connected to a power supply input terminal connected to a DC power supply. The amplifier further includes individual power supply paths each including an end connected to the other end of the common power supply path, and the other end connected to the main electrode of a corresponding one of the amplifier elements. The individual power supply paths have different impedances.

Abstract: A power pooling apparatus uniformly distributes sector loads in a mobile communication system. The power pooling apparatus comprises a distributor for distributing signals output from a signal generator according to respective sectors; a radio signal processor for performing signal processing to provide an output of the distributor to an antenna; and an adaptive signal processor for determining a characteristic matrix of the distributor by using an output in a predetermined position on a signal processing path of the radio signal processor, and providing the characteristic matrix of the distributor to the distributor.

Abstract: The present invention provides a radio frequency power amplifier which may not introduce radio frequency loss during switching power amplifier units between high and low output power levels. By connecting a first-stage matching network M12 and first-stage matching network M13 to respective output nodes of a power amplifier unit A11 and power amplifier unit A12 that either one operate by switching, connecting the output nodes of the first-stage matching network M12 and M13 in parallel, connecting a last-stage matching network M11 between the junction of M12 and M13 and the output terminal OUT, the first-stage matching networks M12, M13, and last-stage matching network M11 are formed, for both power amplifier units A11 and A12, so that impedance matching is established between the output terminal OUT and the power amplifier unit in operation when one unit is in operation the other is in stop of operation.

Abstract: A multi-band power amplifier module includes a first power amplifier that amplifies a first input radio frequency signal in a first frequency band in response to a first bias control signal. A second power amplifier amplifies a second input radio frequency signal in a second frequency band in response to a second bias control signal. A first bias control circuit produces the first bias control signal and a second bias control circuit produces the second bias control signal in response to step gain signals received at a step gain terminal.

Abstract: Power amplifier circuits which constitute an RF power module used for a digital device capable of handling high frequency signals in two frequency bands are disposed over the same IC chip. The power amplifier circuits are disposed around the IC chip, and a secondary circuit is disposed between the power amplifier circuits. Thus, the power amplifier circuits are provided within the same IC chip to enable a size reduction. Further, the distance between the power amplifier circuits is ensured even if the power amplifier circuits are provided within the same IC chip. It is therefore possible to suppress the coupling between the power amplifier circuits and restrain crosstalk between the power amplifier circuits.

Abstract: A power amplifier includes amplifier elements to amplify input signals of different frequencies. The amplifier also includes a power supply circuit that includes a common power supply path including an end connected to a power supply input terminal connected to a DC power supply. The amplifier further includes individual power supply paths each including an end connected to the other end of the common power supply path, and the other end connected to the main electrode of a corresponding one of the amplifier elements. The individual power supply paths have different impedances.

Abstract: A power amplifier includes amplifier elements to amplify input signals of different frequencies. The amplifier also includes a power supply circuit that includes a common power supply path including an end connected to a power supply input terminal connected to a DC power supply. The amplifier further includes individual power supply paths each including an end connected to the other end of the common power supply path, and the other end connected to the main electrode of a corresponding one of the amplifier elements. The individual power supply paths have different impedances.

Abstract: A multi-band power amplifier module includes a first power amplifier that amplifies a first input radio frequency signal in a first frequency band in response to a first bias control signal. A second power amplifier amplifies a second input radio frequency signal in a second frequency band in response to a second bias control signal. A first bias control circuit produces the first bias control signal and a second bias control circuit produces the second bias control signal in response to step gain signals received at a step gain terminal.

Abstract: A multi-band power amplifier module includes a first power amplifier that amplifies a first input radio frequency signal in a first frequency band in response to a first bias control signal. A second power amplifier amplifies a second input radio frequency signal in a second frequency band in response to a second bias control signal. A first bias control circuit produces the first bias control signal and a second bias control circuit produces the second bias control signal in response to step gain signals received at a step gain terminal.

Abstract: A power amplifier includes amplifier elements to amplify input signals of different frequencies. The amplifier also includes a power supply circuit that includes a common power supply path including an end connected to a power supply input terminal connected to a DC power supply. The amplifier further includes individual power supply paths each including an end connected to the other end of the common power supply path, and the other end connected to the main electrode of a corresponding one of the amplifier elements. The individual power supply paths have different impedances.

Abstract: A power amplifier includes amplifier elements to amplify input signals of different frequencies. The amplifier also includes a power supply circuit that includes a common power supply path including an end connected to a power supply input terminal connected to a DC power supply. The amplifier further includes individual power supply paths each including an end connected to the other end of the common power supply path, and the other end connected to the main electrode of a corresponding one of the amplifier elements. The individual power supply paths have different impedances.

Abstract: Systems and methods are disclosed to adaptively pre-distort a signal prior to being used by a non-linear circuit, such as a higher power amplifier (at transmit) or a low noise amplifier (at receive). The signal is compared with a feedback signal from the non-linear circuit and a metric is calculated and minimized. The input signal is adaptively changed, such as by varying tap coefficients, until the metric is sufficiently minimized, resulting in a pre-distorted signal that is substantially linear upon passing through the non-linear circuit.

Abstract: A low noise amplifier (LNA) operates over multiple frequency bands while occupying less silicon area than known LNA implementations. The LNA includes output matching that can be tuned by an adjustable inductor together with a tunable capacitor bank.

Abstract: The dual band bi-directional amplifier has only one amplifier chain having an uplink amplifier and a downlink amplifier, but can nonetheless amplify signals from two frequency bands in both an uplink and a downlink direction between two antennas. This is possible by using duplexers and circulators to separate signals to and from each antenna into the two bands. In particular, for each frequency band handled by the circuit, the dual band bi-directional amplifier has a duplexer set for separating the signals from one of the bands into the uplink and downlink direction. In the case of a dual band amplifier, there are two sets of duplexers, one for each band. By using duplexers and circulators to differentiate signals in different bands travelling in different directions, there is no need for additional amplifier chains, which increase the manufacturing costs.

Abstract: The present invention provides a wideband power amplifier for a multi-mode or multi-band wireless communication device. The wideband power amplifier is configured to amplify signals in different frequency bands corresponding to different operating modes. In general, the wideband power amplifier includes multiple matching circuits that operate to combine the signals in the different frequency bands and provide a combined signal to each transistor in an output stage of the wideband power amplifier.

Abstract: The present invention relates generally to the field of RF transmitters, and more particularly to a method and apparatus for increasing the efficiency of transmitters which are capable of transmitting at different power levels in each of at least two frequency bands. An inventive method is presented as well as an inventive transmitter comprising at least one power amplifier in which the load in the transmission line is varied as the output power is varied, in order to keep the efficiency of the power amplifier at a high level.

Abstract: The present invention provides a high frequency power amplifier of an open-loop type, which outputs a signal having a level corresponding to an output level required under control of a power supply voltage for each output power FET, based on a control signal for the output level. The high frequency power amplifier is provided with a bias voltage generating circuit which generates a gate bias voltage of each output power FET according to an output voltage of a power control circuit for controlling the power supply voltage for the output power FET, based on the control signal for the output level.

Abstract: In a multi-band amplifier, provided are a first differential voltage-to-current converting circuit for converting a first frequency signal into a current and outputting the current, a second differential voltage-to-current converting circuit for converting a second frequency signal into a current and outputting the current, and a current transposition point connected in phase with and in parallel with output terminals of the first and second differential voltage-to-current converting circuits. A base-grounded amplifying circuit is connected in phase with and in series with an output terminal of the current transposition point. With this configuration, the circuit of a virtual ground point and the following of after voltage-to-current conversion can be provided in common by using a cascode amplifier as a low-noise amplifier, making it possible to constitute a multi-band amplifier minimized in the connection loss resulting from interconnection.

Abstract: A power amplifier includes amplifier elements to amplify input signals of different frequencies. The amplifier also includes a power supply circuit that includes a common power supply path including an end connected to a power supply input terminal connected to a DC power supply. The amplifier further includes individual power supply paths each including an end connected to the other end of the common power supply path, and the other end connected to the main electrode of a corresponding one of the amplifier elements. The individual power supply paths have different impedances.

Abstract: At least one amplifier is selected from a first bank of non-linear amplifiers. At least one amplifier is selected from a second bank of non-linear amplifiers. The number of amplifiers selected from the first and second banks remains constant. Using the selected amplifiers, first and second components of a digital symbol are amplified using the first and second banks, respectively. The outputs produced by first and second banks are combined to produce an analog representation of the digital symbol.

Abstract: The invention is a dual band power amplifier with a small footprint having excellent band-to-band isolation. An improved second and fourth harmonic trap at the output of the low band power amplifier comprises a first capacitance shunted to ground placed in series with an inductance, the inductance preferably in the form of a transmission line of predetermined length, and a second capacitance coupled between an intermediate point of the transmission line inductance and ground. Band-to-band isolation can be additively increased by further forming a ground loop between the outputs of the two power amplifiers. The ground loop further isolates the high band amplifier from the low band amplifier by causing the magnetic fields generated around the output wire bonds of the low band power amplifier to set up circulating currents primarily in the ground loop, rather than coupling into the output wire bonds of the high band power amplifier.

Abstract: The invention is a dual band power amplifier with a small footprint having excellent band-to-band isolation. An improved second and fourth harmonic trap at the output of the low band power amplifier comprises a first capacitance shunted to ground placed in series with an inductance, the inductance preferably in the form of a transmission line of predetermined length, and a second capacitance coupled between an intermediate point of the transmission line inductance and ground. Band-to-band isolation can be additively increased by further forming a ground loop between the outputs of the two power amplifiers. The ground loop further isolates the high band amplifier from the low band amplifier by causing the magnetic fields generated around the output wire bonds of the low band power amplifier to set up circulating currents primarily in the ground loop, rather than coupling into the output wire bonds of the high band power amplifier.

Abstract: In a multi-band amplifier, provided are a first differential voltage-to-current converting circuit for converting a first frequency signal into a current and outputting the current, a second differential voltage-to-current converting circuit for converting a second frequency signal into a current and outputting the current, and a current transposition point connected in phase with and in parallel with output terminals of the first and second differential voltage-to-current converting circuits. A base-grounded amplifying circuit is connected in phase with and in series with an output terminal of the current transposition point. With this configuration, the circuit of a virtual ground point and the following of after voltage-to-current conversion can be provided in common by using a cascode amplifier as a low-noise amplifier, making it possible to constitute a multi-band amplifier minimized in the connection loss resulting from interconnection.

Abstract: Apparatus including input ports for inputting a plurality of input signals different in frequency of carrier from one another, dividers for respectively dividing each of the plurality of input signals inputted to the input ports into plural form, and phase shifters for respectively assigning a weight of phase to each of divided signals corresponding to a number obtained by subtracting 1 from the number of divisions. A plurality of first combiners are provided for respectively adding up the signals different in the frequency of carrier, out of the divided signals and signals each assigned the weight of phase, a plurality of amplifiers are provided for respectively amplifying signals outputted from the plurality of first combiners, and a second combiner is provided for adding signals outputted from the plurality of amplifiers to output one signal.

Abstract: Apparatus, methods and articles of manufacture for multiband transmitter power amplification are provided wherein one or more amplifying devices, of which at least one may be one or more current sources, have impedances matched for different input and output frequencies by way of various impedance matching circuits.

Abstract: The present invention relates generally to the field of RF transmitters, and more particularly to a method and apparatus for increasing the efficiency of transmitters which are capable of transmitting at different power levels in each of at least two frequency bands. An inventive method is presented as well as an inventive transmitter comprising at least one power amplifier in which the load in the transmission line is varied as the output power is varied, in order to keep the efficiency of the power amplifier at a high level.

Abstract: In the conventional peak factor reduction technique, since the signal has been changed over broad time width before and behind the peak amplitude, the deterioration in signal quality has been great. Through the use of a compensating signal having impulse property that is generated on the peak amplitude, subtraction from the peak amplitude will be performed. Thereby, since it is possible to reduce the deterioration in signal quality that occurs when reducing the peak factor, the peak factor reduction effect can be further enhanced in the same deterioration in signal quality as the conventional one.

Abstract: The present invention relates to a concurrent multi-band amplifiers and to a monolithic, concurrent multi-band low noise amplifier (LNA). The inventive LNA includes a three-terminal active device, such as a transistor with a characteristic transconductance, gm, disposed on a semiconductor substrate. The active device has a control input terminal, an output terminal, and a current source terminal. The amplifier also includes an input impedance matching network system, Zin, and an output load network. Zin simultaneously and independently matches the frequency-dependent input impedance of the three-terminal active device to a predetermined characteristic impedance at two or more discrete frequency bands. The output load network simultaneously provides a voltage gain, Av, to an input signal at the amplifier input at each of the two or more discrete frequency bands.

Abstract: An amplification part of a power amplifier includes first to third amplifier stages and a signal transmission part provided in parallel with the first amplifier stage. When a mode select voltage Vmod2 is set to the L level, an input signal is amplified by the first to third amplifier stages. At this time, the signal transmission part does not transmit signals. On the other hand, when mode select voltage Vmod2 is set to the H level, the signal transmission part transmits the input signal to a transistor via a diode. At this time, a control voltage Vmod1800 is set to the L level, and the first amplifier stage is turned off, so that power consumption is reduced. Thus, a power amplifier capable of switching a gain in accordance with GSM/EDGE modes while suppressing noise power in a reception band can be provided.

Abstract: In order to provide a high frequency switch in which the setting range of the control voltage is expanded, the high frequency switch is constructed from a switch and a reference voltage generation circuit. The switch comprises first and second field effect transistors. In the first field effect transistor, the source electrode is connected to a signal input terminal, while the drain electrode is connected to a signal output terminal, and while the source electrode is connected to a control terminal. In the second field effect transistor, the source electrode is connected to the signal input terminal, while the drain electrode is connected to the signal output terminal, and while the gate electrode is connected to the control terminal.

Abstract: A method of producing an amplified signal decomposes a signal into at least a first part and second part using at least one amplitude threshold. The first part includes a portion of the signal with a lower peak-to-average power ratio than the signal based on the amplitude threshold. The second part includes a portion of the signal beyond the amplitude threshold. At least the first part and the second part are amplified to produce an amplified first part and amplified second part, which are combined to produce an amplified signal.

Abstract: High efficiency DC to RF conversion with use of active harmonic insertion is provided for power amplification over a wide dynamic range of input signal level. Specifically, a power amplifier device including at least a final amplification stage is operated to receive an input signal of a fundamental frequency. A drive signal is produced which includes a fundamental signal component of the fundamental frequency and at least one harmonic signal component of a harmonic frequency that is substantially an integer multiple of the fundamental frequency, wherein relative phase shift and relative amplitude of the components are controlled over at least an order of magnitude of dynamic range of the input signal. As the signal level of the input signal decreases (or increases), the desired proportion of signal levels is maintained between the components.