Abstract: In one embodiment a mixed-signal adaptive integrated circuit is comprised of a pre-distortion circuit operable to receive an RF input signal and to add a pre-distortion signal to the RF input signal to thereby provide a pre-distorted RF input signal, and a power amplifier coupled to the pre-distortion circuit and operable to receive the pre-distorted RF input signal and to provide an amplified RF output signal. The circuit further comprises a compensation module operable to receive the RF input signal and to provide a compensation signal, an auxiliary amplifier coupled to the compensation module and operable to selectively add the compensation signal to the amplified RF output signal, and a signal analyzer operable to receive and process the RF input signal and an RF output feedback signal to generate a first digital control signal for the pre-distortion circuit and a second digital control signal for the compensation module.

Abstract: An apparatus and a method select and use parameter values for an RF power amplifier linearizer to pre-distort the input signals of a power amplifier, so as to achieve a linear output response in the power amplifier. The apparatus and the method select from a number of sets of parameter values, each set of parameter values corresponding to a different output power range of the power amplifier. The set of parameters include a coefficient vector tailored for the particular output power range for that set. The power amplifier input power is repeatedly measured and filtered at various time intervals. The input power measurements may be filtered by a fast attack/slow decay filter, which follows the peaks of the measurements under operation of the fast attack portion of the filter and provides a low variance during operation of the slow decay portion of the filter.

Abstract: A mixed-signal adaptive integrated circuit may comprise a primary function circuit, a digitally controlled analog sub-system cooperatively connected with the primary function circuit, and an on-chip signal analyzer. The on-chip signal analyzer may be arranged to analyze RF signals. The signal analyzer may comprise at least one multiplexor for selecting selected RF signals for comparison and analysis, and may comprise a digital signal processor (DSP) for analyzing the selected RF signals and adjusting at least one operational parameter of the digital controlled analog sub-system responsive to the analysis.

Abstract: A system for implementing linearization of a radio frequency (RF) power amplifier (PA) in a base station, as well as various component circuitry for implementing said system. By means of a smart partitioning of the signal processing for predistortion between the analog domain and the digital domain, a more linear relationship between the digital input data and the output RF signal is achieved. Linearization of the PA's output signal is obtained using a mixed-signal apparatus. The digital baseband signal enters the RF signal source. The RF signal source comprises an in-band predistortion circuit, a micro-controller and digital modulator. The output of the digital modulator is an RF signal that enters the PA module. The PA module is composed of the PA and the RF power amplifier linearizer (RFPAL). The RFPAL comprises an RF predistortion circuit, and RF signal analyzer and a microcontroller. In addition, a backward data interface connects the RF signal source with the RFPAL.

Abstract: A system for implementing linearization of a radio frequency (RF) power amplifier (PA) in a base station, as well as various component circuitry for implementing said system. By means of a smart partitioning of the signal processing for predistortion between the analog domain and the digital domain, a more linear relationship between the digital input data and the output RF signal is achieved. Linearization of the PA's output signal is obtained using a mixed-signal apparatus. The digital baseband signal enters the RF signal source. The RF signal source comprises an in-band predistortion circuit, a micro-controller and digital modulator. The output of the digital modulator is an RF signal that enters the PA module. The PA module is composed of the PA and the RF power amplifier linearizer (RFPAL). The RFPAL comprises an RF predistortion circuit, and RF signal analyzer and a microcontroller.

Abstract: A mixed-signal adaptive integrated circuit may comprise a primary function circuit, a digitally controlled analog sub-system cooperatively connected with the primary function circuit, and an on-chip signal analyzer. The on-chip signal analyzer may be arranged to analyze RF signals. The signal analyzer may comprise at least one multiplexor for selecting selected RF signals for comparison and analysis, and may comprise a digital signal processor (DSP) for analyzing the selected RF signals and adjusting at least one operational parameter of the digitally controlled analog sub-system responsive to the analysis.

Abstract: An apparatus and a method select and use parameter values for an RF power amplifier linearizer to pre-distort the input signals of a power amplifier, so as to achieve a linear output response in the power amplifier. The apparatus and the method select from a number sets of parameter values, each set of parameter values corresponding to a different output power range of the power amplifier. The set of parameters include a coefficient vector tailored for the particular output power range for that set. The power amplifier input power is repeatedly measured and filtered at various time intervals. The input power measurements may be filtered by a fast attack/slow decay filter, which follows the peaks of the measurements under operation of the fast attack portion of the filter and provides a low variance during operation of the slow decay portion of the filter.

Abstract: A cost function generator circuit includes memory terms each receiving one or more input signals, and each providing inphase and quadrature output current signals. The inphase and quadrature output currents of the memory terms are summed to provide combined inphase and quadrature output currents, respectively. Transimpedance amplifiers are provided to transform the combined inphase and quadrature output currents into an inphase output voltage and a quadrature output voltage.

Abstract: An RF linearizer and an associated method are provided for linearizing a power amplifier. The RF linearizer may include: (a) a quadrature up-converter for up-converting a baseband input signal that is to be transmitted by the power amplifier; (b) an RF analog predistorter controlled by a set of coefficients for predistorting the up-converted input signal; (c) a down-converter for down-converting an output signal of the power amplifier; (d) an error monitor receiving the down-converted output signal and the input signal for providing an error signal; and (e) a signal analyzer receiving the error signal, the signal analyzer using an out-of-band power spectrum of the error signal to optimize the set of coefficients. The input signal may have an in-phase component and a quadrature component.

Abstract: Systems and methods are provided for power measurement of signals such that the power measurement is insensitive to PVT variations of the measurement systems. A power measurement system includes an analog squarer circuitry, an integrating ADC, and a controller. The squarer circuitry calculates the power of a signal whose power is to be measured while the integrating ADC integrates the calculated power over a runup interval to generate an integrated power. The squarer circuitry also calculates the power of a reference for the integrating ADC to de-integrate the integrated power over a rundown interval. The power measurements are independent of PVT variations of the analog squarer circuitry and integrating ADC. The controller digitally controls the runup interval and measures the rundown interval to provide digitized power measurements. The analog squarer circuitry have replica squarer circuits. Process dependent mismatches between the replica analog circuitry may be removed through a calibration process.

Abstract: Systems and methods are provided for power measurement of signals such that the power measurement is insensitive to PVT variations of the measurement systems. A power measurement system includes an analog squarer circuitry, an integrating ADC, and a controller. The squarer circuitry calculates the power of a signal whose power is to be measured while the integrating ADC integrates the calculated power over a runup interval to generate an integrated power. The squarer circuitry also calculates the power of a reference for the integrating ADC to de-integrate the integrated power over a rundown interval. The power measurements are independent of PVT variations of the analog squarer circuitry and integrating ADC. The controller digitally controls the runup interval and measures the rundown interval to provide digitized power measurements. The analog squarer circuitry have replica squarer circuits. Process dependent mismatches between the replica analog circuitry may be removed through a calibration process.

Abstract: An apparatus and a method select and use parameter values for an RF power amplifier linearizer to pre-distort the input signals of a power amplifier, so as to achieve a linear output response in the power amplifier. The apparatus and the method select from a number sets of parameter values, each set of parameter values corresponding to a different output power range of the power amplifier. The set of parameters include a coefficient vector tailored for the particular output power range for that set. The power amplifier input power is repeatedly measured and filtered at various time intervals. The input power measurements may be filtered by a fast attack/slow decay filter, which follows the peaks of the measurements under operation of the fast attack portion of the filter and provides a low variance during operation of the slow decay portion of the filter.

Abstract: RF predistortion apparatus for making linear the output signal of non-linear components such as RF power amplifiers. The apparatus comprises an RF input line for carrying an RF signal connected to an envelope detector for finding the envelope of the RF signal, a power detector for finding the power of the RF signal and a quadrature modulator. The apparatus also comprises a coefficient vector input line for carrying an input signal that carries one or more coefficients to a digitally controlled analog subsystem (DCAS). The DCAS having circuitry for processing both the output of the envelope detector and the output of the power detector by selecting one or more coefficients from the coefficient vector input line for generating a weighted summation of the power of the RF signal and a weighted summation of the envelope voltage of the RF signal that are output to the quadrature modulator.

Abstract: A performance monitor for generating a digital error signal based upon an RF input signal and an amplified RF output signal is provided.

Abstract: Pre-distortion and memory compensation apparatuses and methods for a non-linear component are provided. The apparatus comprises an adaptive block for generating a plurality of correlation coefficients, which are used to weight a plurality of synthesis work functions to pre-distort a given signal. The adaptive block can be driven by an error signal generated from a feedback signal from the non-linear component output signal and a delayed version of the input signal. The apparatus is capable of being operated directly at radio frequency. Also provided are apparatuses and methods for generation of quadrature signals, transconductance amplification employing negative resistance, variable-gain amplification, and envelope detection.

Abstract: In one embodiment, a signal processor for linearizing a non-linear circuit through pre-distortion of an input signal is provided that includes: a first coupler for extracting a version of the input signal, wherein a remaining portion of the input signal not extracted by the first coupler is provided to a first node; a mixer for multiplying the extracted version of the input signal with a pre-distortion signal to produce an additive signal, the pre-distortion signal having a relatively small or zero constant component such that the additive signal includes either no linear version of the input signal or a linear version of the input signal that has a lower power than the remaining portion of the input signal; and a second coupler to add the additive signal to the remaining portion of the input signal at the first node to form a pre-distorted input signal, whereby if the non-linear circuit processes the pre-distorted input signal to form an output signal, the output signal is a substantially linear function of

Abstract: A mixed-signal adaptive integrated circuit may comprise a primary function circuit, a digitally controlled analog sub-system cooperatively connected with the primary function circuit, and an on-chip signal analyzer. The on-chip signal analyzer may be arranged to analyze RF signals. The signal analyzer may comprise at least one multiplexor for selecting selected RF signals for comparison and analysis, and may comprise a digital signal processor (DSP) for analyzing the selected RF signals and adjusting at least one operational parameter of the digitally controlled analog sub-system responsive to the analysis.

Abstract: A performance optimizing circuit is provided for a signal processing system which is parameterized by a set of coefficients that vary the operational characteristics of the signal processing system. The performance optimizing circuit receives as input a reference signal and an output signal of the signal processing system. The performance optimizing circuit may include (a) a cost computation circuit that receives the reference signal and the output signal and provides as output a cost signal representing a cost function computed using a set of current values for the set of coefficients, the output signal and the reference signal; and (b) a cost optimizer circuit that, at each of a plurality of successive time intervals, evaluates one or more values of the cost signal in the cost computation circuit and provides to the signal processing system a new set of values for the set of coefficients.

Abstract: A pre-distorter is provided for distorting an RF input signal to provide a pre-distorted radio frequency (RF) input signal to an amplifier that provides an amplified RF output signal, wherein the RF input signal has an envelope. The pre-distorter includes: a radio-frequency signal processing circuit that distorts the RF input signal according to a polynomial of powers of the envelope, each power of the envelope being weighted by a corresponding pre-distortion weight; and a performance monitor operable to compare a version of the amplified RF output signal to a delayed version of the RF input signal to provide an error signal, wherein the performance monitor is configured to iteratively adapt the coefficients based upon a gradient of a cost function, the cost function being a function of the error signal.

Abstract: Systems and methods provide analog delay elements, which may be utilized in isolation or in a cascade, such as for use within equalizers or other types of applications. For example, a delay element may include a broadband amplifier and a passive, programmable filter, which may provide a desired magnitude and group delay response over a wide frequency range while being tolerant of process variations. An equalizer, for example, may include the delay element within its feed forward filter and/or within its other circuits, such as within its adaptive coefficient generator or slicer input time-align circuit.