8results about "Amplifier with control circuits" patented technology

A digital pre-distortion circuit and technique for a signal being amplified. Digital pre-distortion is performed using a model-based pre-distortion function. Pre-distortion is further corrected using a data-driven pre-distortion function. The model-based pre-distortion function and the data-driven pre-distortion function are trained using training data including a digital loopback signal generated by sampling a loopback signal of an amplifier, the digital pre-distorted signal input to the amplifier for a time period, and an intermediate signal output from the model-based pre-distortion function driven by the digital loopback signal or an output of the data-driven pre-distortion function. Parameters may be continually updated in order to account for changes in characteristics of the amplifier.

In some embodiments, in an RF transceiver system having a transmit chain and a digital predistorter (DPD), a control unit includes: one or more inputs, one of the one or more inputs connected to receive a first signal corresponding to a transmit signal or a modified version of the transmit signal; circuitry configured to generate a control signal for commanding a system state of the transmit chain based in part on the first signal; and an output connected to provide a control signal to the DPD and a plurality of power amplifier (PA) units of the transmit chain, where the DPD is configured to apply digital pre-distortion to a signal to be transmitted based in part on combining the first signal with a second signal corresponding to the control signal or a converted version of the control signal, and providing the resulting pre-distorted signal to a transmit chain operating in a system state.

In some embodiments, in an RF transceiver system having a transmit chain and a digital pre-distorter (DPD), a control unit includes: one or more inputs, one of which is connected to receive a first signal corresponding to a transmit signal or a modified version thereof; circuitry configured to generate a control signal for commanding a system state of the transmit chain based in part on the first signal; and an output connected to provide the control signal to the DPD and to a plurality of power amplifier (PA) cells of the transmit chain, wherein the DPD is configured to apply digital predistortion to the signal to be transmitted based in part on combining the first signal with a second signal corresponding to the control signal or a translated version thereof, and to provide a resulting pre-distorted signal to the transmit chain operating at the system state.

In some embodiments, in a radio frequency (RF) transceiver system having an RF amplifier, a digital pre-distorter (DPD) includes: preprocessing blocks collectively configured to receive input signals and to output preprocessed signals; and a nonlinear combiner. The input signals include a transmit signal and a control signal. The preprocessed signals include a first and a second preprocessed signal, the second preprocessed signal derived at least in part from the control signal. The preprocessing blocks include delay blocks configured to provide the first preprocessed signal corresponding to a delayed or advanced version of the transmit signal with respect to itself. The nonlinear combiner is configured to combine the first and preprocessed signal to provide a pre-distorted version of the transmit signal for transmission via the RF amplifier.

An amplifier (300) comprising: a first signal path comprising a first amplifier circuit (105A) configured to receive a first signal (RF1) having a frequency and having a phase and amplitude at the frequency that can vary; a second signal path comprising a second amplifier circuit (105B) configured to receive a second signal (RF2) having the frequency, wherein at least one of a relative phase and amplitude of the second signal is fixed at the frequency; a combiner circuit (106) configured to combine outputs of the first amplifier circuit and the second amplifier circuit.

In some embodiments, a digital predistorter (DPD) in an RF transceiver system having a radio frequency (RF) amplifier includes: pre-processing blocks collectively configured to receive an input signal and output a pre-processed signal; and a non-linear combiner. The input signal includes a transmit signal and a control signal. The pre-processed signal includes a first pre-processed signal and a second pre-processed signal, the second pre-processed signal being at least partially derived from the control signal. The pre-processing block includes a delay block configured to provide a first pre-processed signal corresponding to a delayed or advanced version of the transmit signal with respect to itself. The non-linear combiner is configured to combine the first and pre-processed signals to provide a pre-distorted version of the transmit signal for transmission via the RF amplifier.

Load modulated power amplifiers with phase compensation are disclosed herein. In certain embodiments, a load modulated power amplifier includes a load modulation capacitor, a pair of amplifiers, an output balun having a primary winding connected between the outputs of the pair of amplifiers and a secondary winding connected between an output terminal and the load modulation capacitor, and a load modulation control amplifier that controls a capacitance value of the load modulation capacitor based on an envelope of a radio frequency (RF) signal received at an input terminal to the load modulated power amplifier. The load modulated power amplifier further includes a phase modulation capacitor connected along an RF signal path between the input terminal and the output terminal and a phase modulation control amplifier that controls a capacitance value of the phase modulation capacitor to provide phase compensation.

A digital pre-distortion circuit and technique for a signal being amplified. Digital pre-distortion is performed using a model-based pre-distortion function. Pre-distortion is further corrected using a data-driven pre-distortion function. The model-based pre-distortion function and the data-driven pre-distortion function are trained using training data including a digital loopback signal generated by sampling a loopback signal of an amplifier, the digital pre-distorted signal input to the amplifier for a time period, and an intermediate signal output from the model-based pre-distortion function driven by the digital loopback signal or an output of the data-driven pre-distortion function. Parameters may be continually updated in order to account for changes in characteristics of the amplifier.