Abstract: A method of reducing distortion in the output of an amplifier is provided. The method comprises subtractively combining an error signals with the appropriate phase shift with input signals to be amplified. The error signal being generated by subtractively combining a fed-forward portion of the input signal with a portion of the fed-back amplified output signal, and signal processing applied to it between its generation and application to correcting the input signal in the baseband domain. The error therefore being down-converted, filtered, and up-converted in the feedback path. The filtered baseband error signal components providing inputs to a controller which adjusts active elements of the amplification and feedback path in order to minimize the distortion within the output of the amplifier.

Abstract: A quadrature modulator divides a first signal input as a local signal into an I channel signal and a Q channel signal orthogonal to each other and outputs a second signal having a desired phase delay corresponding to direct current voltages as for the first signal by giving the direct current voltages Vi and Vq to the I channel signal and the Q channel signal, respectively. A phase comparison unit detects a phase difference ? between the first signal and the second signal. A setting unit sets the desired phase delay. A controller section controls the direct current voltages supplied to the I channel signal and the Q channel signal respectively in the quadrature modulator so that an output value corresponding to the phase difference ? detected by the phase comparison unit is equal to a value corresponding to the desired phase delay set by the setting unit, and controls the direct current voltages to be the direct current voltages Vi and Vq satisfying the relation of Vi=cos ? and Vq=sin ?.

Abstract: Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.

Abstract: Provided is an HPA apparatus for a TDD wireless communication system. In the HPA apparatus, a power amplifier amplifies the power of an input signal. A gate bias controller turns on/off a gate bias of the power amplifier in accordance with a TDD control signal. A constellation error optimizer circuit removes a current fluctuation and a power noise, which occur when the gate bias controller turns on/off the power amplifier in a TX mode, to stabilize a drain bias thereof.

Abstract: The invention relates to a method and a transmitter implementing the method, wherein signal errors caused by high-rate power control commands are eliminated. The invention is based on weighting a signal to be supplied to an amplifier while the gain of a power amplifier is in a transition state.

Abstract: In a SPDT switch, a resistor for leak path is connected between a terminal for antenna and a reference potential. The resistor for leak path allows charge capacitances accumulated in electrostatic capacitor elements provided as DC cut capacitors connected to transmission signal terminals and reception signal terminals to be discharged and allows rapid lowering of a potential at the terminal for antenna. In the SPDT switch, a switching characteristic is improved and a delay in the rising edge of a low-power slot which comes after a high-power slot is reduced.

Abstract: Switching characteristics in an SPDT switch are improved to reduce the rise delay in a low power slot following after a high power slot. Control terminals of an SPDT switch are respectively provided with backflow prevention circuits. The backflow prevention circuit is configured to have two transistors and a diode. In a transmission mode, for example, when a time slot where a high power passes through transistors is followed by a time slot where a low power passes through, the electric charges accumulated in the gates of the transistors are blocked. In the case where the transistors are in the OFF state, the electric charges accumulated in the gates of the transistors are immediately discharged to allow the transistors to be completely turned OFF.

Abstract: Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.

Abstract: Disclosed herein are methods and apparatus for processing an input information signal having varying amplitude and phase to obtain an amplified output signal having the same amplitude and phase variation. In an exemplary method, an input information signal is decomposed into two pairs of constant-envelope component signals such that the vector sum of the first pair is orthogonal to the vector sum of the second pair, for desired signal amplitudes below a level corresponding to a pre-determined threshold. For desired signal amplitudes above this level, the input information signal is instead decomposed into two pairs of constant-envelope component signals such that the vector sum of the first pair is separated by less than ninety degrees from the vector sum of the second pair. The constant-envelope component signals may be amplified by highly-efficient non-linear amplifier elements and combined to obtain the amplified output signal.

Abstract: A supply voltage to a power amplifier is controlled. A signal at a single point in a power amplifier is detected. A signal parameter is determined for the detected signal. The signal parameter is compared to at least one predetermined limit. This comparison result is used to determine whether to adjust a supply voltage to the power amplifier. The signal parameter is, for example, an average power or a peak-to-average power ratio.

Abstract: The invention decreases phase distortion in a transmitter by balancing C load in the power amplifier input such that a PGA won't have phase distortion.

Abstract: A multi-channel amplifier has inputs via which input signals can be fed to the multi-channel amplifier. The input signals are amplified into output signals by amplifier channels of an amplification stage of the multi-channel amplifier and then are emitted via outputs of the multi-channel amplifier. An adjustment device is associated with the amplification device that allows dynamic adjustment of a limit power, up to which the respective output signal can be amplified, for each output. The limit power can be set to a maximum value for each output. The multi-channel amplifier is fashioned such that the sum of the limit powers of all outputs can always be simultaneously emitted independent of the current setting of the limit powers, but such that the sum of the limit powers is always smaller than the sum of the maximum values of all outputs. Such a multi-channel amplifier is particularly suitable for use in a transmission arrangement for radio-frequency signals.

Abstract: A wireless communication device is disclosed which employs a minimal number of power calibrations to set the output power of the device to a specified output power level. In one embodiment, the disclosed communication device includes a self calibrating feature that sets the output power level during initialization of the device.

Abstract: A MMIC includes at least one quadrature hybrid in a plurality of series connected amplifiers connected in two parallel gain stages and operatively connected to the at least one quadrature hybrid such that gain is equalized in the two parallel gain stages.

Abstract: In a particular embodiment, a circuit device includes an input to receive a pulse-width modulated (PWM) signal and an output to send a modulated PWM signal. The circuit device further includes a pulse edge control circuit coupled between the input and the output. The pulse edge control circuit receives the PWM signal via the input and includes a control input to receive a modulation control signal. The pulse edge control circuit is adapted to modify the PWM signal to provide the modulated PWM signal with suppressed carrier power and associated harmonics to the output based on the modulation control signal. The circuit device further includes a modulation sequence controller adapted to provide the modulation control signal via the control input. The modulation control signal selectively controls a sequence of the modification of the PWM signal to selectively alter an output power spectrum of the modulated PWM signal.

Abstract: DC power savings in a mobile communication device can be achieved by dynamically adjusting the biasing for a receiver based on the communication link quality. The output signal levels of at least one low noise amplifier (LNA) are monitored to identify the DC operating conditions for the LNA. Closed loop control of the DC biasing is adjusted based on a comparison between the monitored DC operating conditions and a reference signal. The output of the LNA is also coupled to a radio receiver section that is configured (e.g., SW or HW) to evaluate the link quality based on various criteria such as inter-modulation distortion, noise, interference, fading, etc. The reference signal that is used to control the DC biasing of the LNA is adjusted (periodically, continuously, or on demand) in response to the evaluated link quality. The dynamic biasing yields acceptable signal reception with low DC power consumption.

Abstract: A method of controlling amplification of a signal emitted by a radiocommunication terminal including a power amplifier and a power supply battery includes the steps of detecting the output power of the amplifier and converting the output power into a detected voltage, comparing the detected voltage with a set point voltage, and adapting the input power of the power amplifier as a result of the comparison. The detected voltage and/or the set point voltage is rendered dependent on the voltage of the power supply battery during the step of detecting and converting the output power of the amplifier.

Abstract: A method and an apparatus for amplifying power in a communication system is disclosed that includes a detection module which detects a power level of a predetermined signal selected from among an input signal and an output signal of a power amplifier and then transmits an operation mode control signal for the power amplifier; a gate bias controller which controls a gate bias of the power amplifier in accordance with the detected power level; and a power amplifier which operates as class B or class A in accordance with control by the gate bias controller to generate a pre-distortion component, offsets a distortion component generated during amplification of the predetermined signal by synthesizing the pre-distortion component with the distortion component, and outputs only the predetermined signal without a distortion component.

Abstract: A power amplifier module includes a first power amplifier, a second power amplifier, and a controlling module. The first power amplifier has an amplification set for optimal efficiency in accordance with most probable transmit power level settings within a transmit power level range. The second power amplifier has an amplification set for optimal efficiency in accordance with the most probable transmit power level settings within the transmit power level range. The controlling module is coupled to: enable one of the first and second power amplifiers to amplify an outbound radio frequency (RF) signal in accordance with a power setting when the power setting is not within the most probable transmit power level settings; and enable at least one of the first and second power amplifiers to amplify the outbound RF signal in accordance with the power setting when the power setting is within the most probable transmit power level settings.

Abstract: A transmit amplifier stage operable to amplify a transmit signal comprises power amplifiers and switches. The power amplifiers include at least one fractional power amplifier operable to provide fractional power to amplify the transmit signal, where the fractional power is a fraction of the full power. A switch has a plurality of positions, where a position directs the transmit signal to a selected power amplifier.

Abstract: In-phase (I) and quadrature-phase (Q) signals are corrected for both amplitude and phase imbalances by passing the I and Q signals successively through a first amplitude correction stage, a sum-difference stage, and a second amplitude correction stage. The first amplitude correction stage balances the signal levels of the I and Q signals. The sum-difference stage produce a sum of the input I and Q signals, and a difference of the input I and Q signals, resulting in ideal quadrature in the outputs produced. The second amplitude correction stage corrects the amplitude differences from the sum-difference stage. Circuit configurations are used that minimize errors produced by the signal processing stages.

Abstract: An amplifier arrangement contains a first signal input for supplying a carrier signal, a second signal input for supplying an amplitude modulation word and an amplifier stage. The amplifier stage is connected to a reference potential connection and, by means of a control connection via a means for DC signal suppression, to the first signal input. A DC voltage converter having a first connection for supplying a potential is designed to convert the potential into a supply potential, which is variable over a period of time, on the basis of a control signal, and outputs the supply potential to the second connection of the amplifier stage. In addition, the amplifier arrangement comprises a digital/analog converter which is coupled to the control connection of the amplifier stage. The input of the converter is connected to the second signal input.

Abstract: Cross-Correlated Time Division Multiple Access (TDMA), Spread Spectrum, Code Division Multiple Access (CDMA) and Orthogonal Frequency Division Multiplexed (OFDM) modulated OFDM receiver and demodulator systems. Receiver for receiving a Time Division Multiple Access (TDMA) modulated signal having a first modulation format and a second modulated signal having a second modulation format and demodulator, filter and processor for demodulating, filtering and processing the received TDMA modulated signal and for filtered, processed cross-correlated in-phase and quadrature-phase baseband signals and demodulating the second modulated signal providing a demodulated baseband signal. A demodulator system containing two demodulators for demodulating the received signal. Receiver for receiving a Time Division Multiple Access (TDMA) and a Orthogonal Frequency Division Multiplexed (OFDM) modulated signal.

Abstract: Methods and apparatus are provided for stabilizing the phase and gain of an amplifier in a power pooling arrangement. A pilot signal combining a reference carrier frequency with a reference sideband frequency is passed through the amplifier via an adjustable phase shifter and an adjustable attenuator in the amplifier input line. A portion of the amplified pilot signal is coupled from the output of the amplifier and mixed with the reference frequency. The remaining audio frequency signal is compared to a reference (input) audio signal to determine phase and gain changes during amplification in the amplifier. Phase and gain control signals are developed from this comparison, and are fed back to the adjustable phase shifter and adjustable attenuator, respectively, in order to compensate an incoming signal for phase and gain variations in the amplifier.

Abstract: In a transmission path having two discrete-value adjustable amplifiers, a first amplifier is set with a first gain factor and a second amplifier is set with a second gain factor. A signal is then applied to an input of the transmission path, and a level of a first output signal of the transmission path is ascertained and the second gain factor is altered. The first gain factor is changed in the opposite direction, so that a total gain factor of the transmission path remains substantially the same. The level of an output signal from the transmission path is then ascertained again with the new settings. An offset value is determined by comparing the levels of the first and second signals. As a result, the second amplifier can be calibrated using relative measurements and the first amplifier.

Abstract: A power amplifier arrangement having a distributed antenna is disclosed. The power amplifier arrangement has two or more signal paths which are coupled to a common input. Each signal path has an amplifier with a downstream antenna. The respective signal paths with the antenna are activated or deactivated by a control device as a function of the desired gain or output power. This results in high efficiency over a wide frequency range. The polar diagrams of the antenna branches preferably correspond to those of a single antenna.

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 power amplifier drivers (PADs) having respective first and second non-linear phase responses. The first non-linear phase response is based on a first bias applied to the first PAD, and the second non-linear phase response is based on a second bias applied to the second PAD. The first and second PADs are coupled in parallel to provide a combined substantially linear phase response. According to an embodiment, the first and second PADs have respective first and second average input capacitances. Signal swings about the first and second biases vary the respective first and second average input capacitances, which may be combined to provide a combined average input capacitance that is substantially insensitive to the signal swings about the first and second biases.

Abstract: A method and system for diversity transmission from a mobile station. Signals sent from a mobile station to a base station may suffer from fading. To combat this, diversity transmission is used to compensate for the effects of fading and destructive multi-path interference by sending two or more signals. Signals to be transmitted from the mobile station are split into a first split signal and a second split signal and diversified from one another. Diversification of the split signals may be accomplished by modifying the phase of either the first split signal, the second split signal or both the first and second split signal. The diversified signals may then be transmitted from a first and second antenna.

Abstract: Power consumed by a power-variable amplifying unit for amplifying and supplying data to an antenna in a mobile telephone carrying out data transmission by changing transmission power in accordance with a TPC bit transmitted from a base transceiver station is reduced. The power-variable amplifying unit is constituted with a variable gain amplifier (21) in which a gain is variably controlled with a control voltage corresponding to the above-described TPC bit, a driver amplifier (22) with a fixed gain, and a power amplifier (23) with a fixed gain. Then, a variable resistance 25 for bypassing a current flowing through a transistor (26) of the driver amplifier (22) is provided, and a resistance value of this variable resistance (25) is variably controlled with the control voltage corresponding to the above-described TPC bit. Accordingly, a current quantity of the current flowing through the transistor 26 can be controlled to be a current quantity according to the control voltage (=transmission power).

Abstract: A thermostat control system having remote devices and/or other internally powered devices provides transmissions at different power levels and at different data transfer rates to conserve power life. Thermostat control system components and devices may be powered by replaceable power supplies that are conserved by transmitting at a lower power level more often than at a higher power level. A higher power level transmission is provided at a lower data transfer rate, and a lower power level transmission is provided at a higher data transfer rate. A higher power transmission is provided periodically to ensure reliable communication of temperature information.

Abstract: A transmitter arrangement includes a first amplifier arrangement and a second amplifier arrangement. The first amplifier arrangement includes a first amplification path and a second amplification path. The first amplification path is adapted to amplify signals comprising a data content according to a first communication standard. The second amplification path is adapted to amplify signals comprising a data content according to a second communication standard. The second amplifier arrangement further includes a first and second amplification path sharing at least one common amplifier stage that is adapted to amplify signals having a data content according at least to the second communication standard.

Abstract: Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.

Abstract: A transmitter employing variable gain amplifiers and operating with both constant and nonconstant envelope modulation systems is contrived to suppress variation in the transmitting power when constant envelope modulation is performed. The transmitter comprises a PM loop, an AM loop, and a variable gain amplifier which is shared by the PM loop and the AM loop and combines phase information that the PM loop outputs and envelope information that the AM loop outputs by gain control. The variable gain amplifier comprises a variable gain amplifier body having a supply voltage terminal and a bias current detection terminal for extracting a bias current corresponding to a gain, wherein the gain changes with a change in the potential of the supply voltage terminal, and a bias control block connected to the supply voltage terminal and the bias current detection terminal.

Abstract: An RF circuit module, in which a power amplifier and a transceiver are united, with reduced interference between its electronic circuit blocks, downsized and still having high performance, and with a stable performance not dependent on the ground land structure on the motherboard, is provided. The ground plane 110 for at least a last-stage amplifier 11 of the power amplifier 10 where the greatest power is generated in the whole RF circuit block, that is, the source of generating the greatest noise and heat for the RF circuit block, is isolated from the ground plane for at least one circuit portion of the transceiver 9 including an LNA 51, receiver 52, transmitter 30, and VCO 70. These ground planes are connected to a common ground plane 480 through different connection conductors, respectively.

Abstract: The present invention, generally speaking, provides methods and apparatus for producing an amplitude modulated communications signal, in which a constant-envelope carrier signal is modified in response to a power control signal to produce a modified constant-envelope carrier signal. The modified constant-envelope carrier signal is amplified in response to an amplitude modulation signal to produce a communications signal having amplitude modulation and having an average output power proportional to a signal level of the modified constant-envelope carrier signal. This manner of operation allows wide dynamic range of average output power to be achieved. Because amplitude modulation is applied after amplitude varying circuitry used to produce the modified constant-envelope carrier signal, the amplitude modulation is unaffected by possible non-linearities of such circuitry.

Abstract: A communication semiconductor integrated circuit includes a phase control loop and an amplitude control loop. A gain of a variable gain amplifier when it is detected from an output of the comparator that the amplitudes of the reference signal and the feedback signal are equal to each other while a predetermined DC voltage is applied to an amplifier which amplifies an output of a transmission oscillation circuit and is controlled by the amplitude control loop to vary the gain of the variable gain amplifier on a feedback path is held in a register. Thereafter, the DC voltage is changed to another value to detect the gain of the variable gain amplifier, so that the gain of a variable gain amplifier on the forward path is decided on the basis of the detected gain and the gain held in the register.

Abstract: A method for wireless communication that dynamically adjusts RF amplifier operating bias for the subscriber unit's transmitter in response to a power control signal. The invention provides high-efficiency RF power amplification for applications where the available power source is limited. The invention uses a power control signal resident in wireless communication system architectures with a detector and voltage to current converter to arrive at a dynamic amplifier operating bias.

Abstract: An apparatus and method are disclosed for partitioning and downloading executable memory images in low-powered computing devices comprised of multiple processors and a mobile station modem. The general computing subsystem 102 handles tasks generally related to a personal digital assistant (PDA) as well as activating the modem computer subsystem 104 and one or more shared memory modules 108-110. The modem computing subsystem 104 handles tasks associated with a mobile station modem. Power is conserved by not clocking the modem computer system 104 and the shared memory 108-110 during times when modem functions are not needed. The shared memory modules 108-110 are loaded with a binary memory image for use by the modem computer subsystem 104 from a memory 222 under control of the general computing subsystem 102. When needed, the modem computing subsystem 104 is activated to monitor a paging channel, and disabled when it is no longer desired to monitor the paging channel.

Abstract: A supply voltage controlled power amplifier that comprises a power amplifier, a closed power control feedback loop configured to generate a power control signal, and a dual voltage regulator coupled to the power control feedback loop, the dual voltage regulator comprising a first regulator stage and a second regulator stage, wherein the closed power control loop minimizes noise generated by the first regulator stage.

Abstract: A transmission power control apparatus which reduces the number of steps required for adjustments of the transmission power control apparatus and performs transmission power control with high accuracy in a wide dynamic range. The apparatus has a first variable amplifying circuit (122) with the resolution of 1 dB and a second variable amplifying circuit (123) with the resolution of 0.

Abstract: One of objects of a wireless communication apparatus according to the present invention is to realize stable communication regardless of received signal strength indication and information amount. The wireless communication apparatus for communicating in an autonomous distributed wireless network includes a detection unit which generates a detection signal by detecting a first wireless signal from a first wireless apparatus; a wireless circuit which receives a second wireless signal relating to said first wireless signal, transmitted from a second wireless apparatus which received said first wireless signal; a signal estimation unit which estimates said detection signal and the received second wireless signal; a signal selector which selects either said detection signal or the received second wireless signal, based on an estimation result of said signal estimation unit; and a demodulator which demodulates the signal selected by said signal selector.

Abstract: A source binary code that complies with a source architecture is translated to a target binary code that complies with a target architecture. The target binary code includes a first target portion translated from a respective source portion of the source binary code. During execution of the target binary code on a processor that complies with a target architecture, it is determined whether to retranslate the source portion to produce a second target portion that is more optimized to the target architecture than the first target portion or to retranslate the source portion to produce a third target portion that is more optimized to the target architecture than the second target portion.

Abstract: A circuit arrangement includes two adjustable amplification devices where the signal output of the first amplification device is connected to the signal input of the second amplification device. The first amplification device has a digital input for controlling its gain and the second amplification device has an input for controlling its gain. The input for gain control in the second amplification device is connected to the input for controlling the gain of the first amplification device via a means such that a change in the gain of the second amplification device in one direction is effected by a change in gain, brought about by means of the control, in the first amplification device in the opposite direction such that the total gain remains essentially the same.

Abstract: A wireless transmitter (100) including an amplifier (112), an automatic output controller (116) (AOC) having an output coupled to a control signal input. The AOC detects a second amplifier parameter that changes with a change in load impedance during a transmission, and the AOC reduces a change in transmitter output power related to the change in load impedance based on a first parameter and the detected second parameter during the same transmission during which the second parameter was detected.

Abstract: Smart transmitter system that includes apparatus for an automatic gain control circuit. The apparatus includes a circuit translates a transmit power control signal to produce a linear signal, and a first mapping circuit that maps the linear signal to a first control signal that is coupled to a variable gain amplifier (VGA). The apparatus also includes a power amplifier (PA) control circuit that receives the linear signal and a transmit signal to produce a second control signal that is coupled to a power amplifier.

Abstract: g(x) Storing means stores a correction function y=g(x) corresponding to the distortion of a high frequency power amplifier as a function of a voltage x provided to a power supply terminal of the high frequency power amplifier. Operating means receives the correction function g(x) and a complex vector modulation signal z provided from modulation signal generating means, then causes an inverse function g?1 to operate on the absolute value and the phase of the complex vector modulation signal z having undergone polar coordinate conversion, and thereby outputs z?=g?1(z). This data is provided to the high frequency power amplifier. Further, triangular wave storing means is provided for storing a triangular wave having the same amplitude as that of the modulation signal. Either the triangular wave signal outputted from the triangular wave storing means or the modulation signal z? is selectively provided to the high frequency power amplifier.

Abstract: The present invention, generally speaking, provides methods and apparatus for producing an amplitude modulated communications signal, in which a constant-envelope carrier signal is modified in response to a power control signal to produce a modified constant-envelope carrier signal. The modified constant-envelope carrier signal is amplified in response to an amplitude modulation signal to produce a communications signal having amplitude modulation and having an average output power proportional to a signal level of the modified constant-envelope carrier signal. This manner of operation allows wide dynamic range of average output power to be achieved. Because amplitude modulation is applied after amplitude varying circuitry used to produce the modified constant-envelope carrier signal, the amplitude modulation is unaffected by possible non-linearities of such circuitry.

Abstract: An architecture, circuits, systems and a method for amplifying an analog signal. The architecture and/or circuit generally includes a first fixed stage (e.g., a predriver) and an adjustable stage. The first fixed stage may be configured to amplify an analog signal and provide a first amplified analog output at a first common node. The adjustable stage may comprise a plurality of independently selectable parallel amplifier segments. Each of the parallel segments may have an input at the first common node and an output at a second common node, a transistor having a control terminal, and a first inductor in electrical communication with the control terminal of the transistor. The adjustable stage may be configured to apply a bias to the control terminal of the transistor in a selected segment and to provide an output signal in one of a plurality of a power ranges corresponding to a number of selected parallel amplifier segments.

Abstract: Communication and broadcast system for Time Division Multiple Access (TDMA), spread spectrum, filtered signal and cross-correlated in-phase and quadrature-phase baseband signals for Radio Frequency (RF) tunable or RF agile transmitters. A selector and connection device provides selection and connection of one or more of the TDMA, spread spectrum, filtered or cross-correlated baseband signals and or modulated signals to a transmitter. A first baseband and or modulation circuit provides spread spectrum signal, a second baseband and or modulation circuit provides TDMA signal, a third circuit provides filtered and or cross-correlated baseband and or modulation signals to a selector for selecting either one or more modulated signals and providing the selected signals to the transmitter.

Abstract: A multi-stage amplifier includes first and second amplification stages and a loading stage, all of which generate flicker noise. A degeneration block is operably disposed between circuit common and the loading stage wherein the degeneration block is operable to reduce flicker noise generated by at least one of the loading stage, the first amplification stage and the second amplification stage. The degeneration block further includes at least one active MOSFET operably biased in a linear region to provide a specified resistive value and coupled to receive and conduct the common mode portion of the intermediate stage output signal based upon a gate terminal bias signal. A degeneration block amplifier is operable to generate a replica device bias signal wherein the replica device is operable to set the gate terminal bias signal for the at least one active MOSFET based upon the replica device bias signal.