Control of RF error extraction using auto-calibrating RF correla

Details Control of RF error extraction using auto-calibrating RF correla Control of RF error extraction using auto-calibrating RF correla

1998-02-20

1999-07-27

Pascal, Robert

Amplifiers

Hum or noise or distortion bucking introduced into signal...

330151, H03F 126

Patent

active

059297042

ABSTRACT:
An RF power amplifier has an RF input port to which an RF input signal is coupled, an RF output port from which an amplified RF output signal is derived. An RF carrier cancellation combiner has a first input coupled to the RF input port and a second input coupled to the RF output port. The carrier cancellation combiner produces an RF error signal representative of RF distortion of a signal flow path through the RF amplifier between the RF input port and the RF output port. To reduce a residual carrier signal in the RF error signal, a wideband autocalibrating correlator correlates a reference signal, representative of the RF input signal, with the RF error signal, producing a control signal, which is coupled to a vector modulator to modify the signal flow path through the RF amplifier. A digital signal processor within the correlator measures DC distortion associated with the multiplier components of the correlator and controllably removes DC distortion from the control signal, so that modification of the signal flow path through the RF amplifier by the vector modulator is controlled with a higher precision, providing maximal carrier cancellation.

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