Circuit layout and method for adjusting a band filter in a radio receiver has a band filter, a voltage-controlled oscillator, a tuner, a reference oscillator, a phase locked loop (PLL) actuator, an equalizer and a micro-controller.

摘要

An oscillator tuning signal specifying a receiver channel creates a filter tuning signal for adjusting a receiver's band filter (1). A test signal is generated with a multi-lined frequency spectrum. Two frequencies corresponding to one spectral line are selected as a test frequency. A radio receiver has a band filter, a voltage-controlled oscillator (2), a tuner (3), a reference oscillator (4), a PLL actuator (5), an equalizer (6), and a micro-controller (7).