Patent ID: 6084920
Filing Date: 2000-07-04
Classification: H03G

Abstract:
A regulator loop for controlling the RF output power from a power amplifier of a radio phone, said regulator loop comprises:a diode detector for detecting an RF signal from said power amplifier and for providing an output signal in response thereto;a controlling circuit for generating a control signal for the power amplifier in dependence of the output signal from said detector and a reference signal representing the desired output power of the power amplifier;said diode detector comprises a voltage divider configuration which forms part of a DC path across which a DC bias is applied, said voltage divider configuration comprises two resistors and a detector diode and a compensator diode, and the input and the output of the diode detector being connected to respective terminals of the detector diode in said DC path; andsaid controlling circuit combines the output signal from said detector and the reference signal for providing the control signal for the power amplifier; and whereinsaid controlling circuit provides a moderate load on the output of the detector ensuring that the output signal from the diode detector, in terms of DC, does not exceed half the DC bias applied to the diode detector.