POWER AMPLIFIER SATURATION DETECTION AND COMPENSATION

摘要

A system for detecting and compensating for a saturation condition of a powe r amplifier where an error signal is produced by differencing a signal representative of or derived from a control signal for controlling the shape of the output of the power amplifier and a signal representative of or deriv ed from the output of the power amplifier. An integrator integrates the error signal to produce a cumulative error signal. A detection circuit detects a saturation condition when the value of the cumulative error equals or exceed s a predetermined value determined during device calibration. Upon the detecti on of a saturation condition, a compensation circuit derives a compensation val ue by multiplying the value of the error signal at the time saturation is detected by a predetermined constant, and subtracts this value from the control signal. The input to the power amplifier is derived from the adjuste d control signal.