Receiver having reduced influence of oscillator radiation and parasitic crosstalk effects on gain control

摘要

Receiver having an RF input for applying an RF input carrier thereto, which receiver is coupled to a phase-locked loop (PLL) whose signal path incorporates a phase detector, a loop filter, a controlled amplifier and a controlled oscillator, and a signal generator for generating a local auxiliary pilot and a pilot detector for detecting the local auxiliary pilot, a first input of which is coupled to the signal path of the PLL between an output of the phase detector and a control input of the controlled oscillator, a second input is coupled to an output of the signal generator and an output is coupled to a control input of the controlled amplifier via a selection device. To reduce the influence of oscillator radiation and other parasitic crosstalk effects on the gain control, the output of the signal generator in the receiver is coupled to the signal path between an output of the phase detector and the control input of the controlled oscillator for an angle modulation of the oscillator signal with the auxiliary pilot.