Receiver mixes input signal with generated carrier signal, filters out unwanted mixing products, digitizes signal and processes it in signal processor clocked with system clock

摘要

The receiver has a mixer stage (3) for mixing an input signal (1) with a carrier signal (5), a filter stage for filtering out unwanted mixing products and followed by an analogue-to-digital converter (7), then a signal processor (8) clocked with a system clock and a variable frequency signal generation stage (4) coupled to the mixer stage and to the signal processor for generating the carrier signal in synchronism with the system clock. The signal processor processes the intermediate frequency signal in a defined frequency band.