Abstract: A method and system of compensating for distortion in a baseband in-phase (I) and a corresponding baseband quadrature (Q) signal. The circuit includes an in-phase I attenuator configured to attenuate the baseband in-phase I signal and an in-phase Q attenuator configured to attenuate the baseband Q signal. There are one or more circuits that are configured to receive the attenuated in-phase I signal and the attenuated baseband Q signal. Each circuit performs a different calculation based on predetermined equations configured to determine the IM2, HD2@0°, HD2@90°, IM3@0°, IM3@90°, HD3@0°, and HD3@90°. The distortion compensation circuit is configured to use the result of at least one of the calculation circuits to generate I and Q distortion compensation signals.

Abstract: A method and system of compensating for phase error. A phase error compensation circuit is configured to generate a phase-corrected quadrature Q output signal and a corresponding phase-corrected in-phase I output signal, the circuit includes a first transconductance circuit configured to convert a voltage signal related to an I input voltage signal to an I current signal. A second transconductance circuit is configured to convert a voltage signal related to a Q input signal to a Q current signal. A first multiplier circuit is configured to multiply the Q current signal times a Q scaling constant. A second multiplier circuit is configured to multiply the I current signal times an I scaling constant. An I summer sums the I current signal with the scaled Q signal. A Q summer sums the Q current signal with the scaled I signal.

Abstract: A method and system of compensating for phase error. A phase error compensation circuit is configured to generate a phase-corrected quadrature Q output signal and a corresponding phase-corrected in-phase I output signal, the circuit includes a first transconductance circuit configured to convert a voltage signal related to an I input voltage signal to an I current signal. A second transconductance circuit is configured to convert a voltage signal related to a Q input signal to a Q current signal. A first multiplier circuit is configured to multiply the Q current signal times a Q scaling constant. A second multiplier circuit is configured to multiply the I current signal times an I scaling constant. An I summer sums the I current signal with the scaled Q signal. A Q summer sums the Q current signal with the scaled I signal.

Abstract: A method and system of compensating for distortion in a baseband in-phase (I) and a corresponding baseband quadrature (Q) signal. The circuit includes an in-phase I attenuator configured to attenuate the baseband in-phase I signal and an in-phase Q attenuator configured to attenuate the baseband Q signal. There are one or more circuits that are configured to receive the attenuated in-phase I signal and the attenuated baseband Q signal. Each circuit performs a different calculation based on predetermined equations configured to determine the IM2, HD2@0°, HD2@90°, IM3@0°, IM3@90°, HD3@0°, and HD3@90°. The distortion compensation circuit is configured to use the result of at least one of the calculation circuits to generate I and Q distortion compensation signals.

Abstract: A differential amplifier may, when connected to a positive or negative supply voltage and to a ground voltage, provide a differential pair of outputs signals at a differential output that are an amplification of a differential pair of input signals at a differential input. A differential input stage may receive the differential pair of input signals from the differential input and may include a first transistor associated with one of the input signals and a second transistor associated with the other input signal. A differential output stage may generate the differential pair of output signals at the differential output and may include a third transistor associated with one of the output signals and a fourth transistor associated with the other output signal. The first, second, third, and fourth transistors may be all P type or all N type.