Patent ID: 6018702
Filing Date: 2000-01-25
Classification: G01R,H03H

Abstract:
A filter calibration system for a tuned filter having a passband center frequency adjustable according to an applied control signal, comprising:an oscillator providing a stimulus signal;a mixer having three ports, the mixer coupled to the oscillator at the first port and coupled to an output of the tuned filter at the second port, the first port receiving the stimulus signal and passing the stimulus signal to the second port, the stimulus signal producing a reflected signal at the output of the tuned filter and a transmitted signal at an input of the tuned filter, the mixer detecting the reflected signal at the second port and producing a reflection response at the third port as the applied control signal is varied over a predetermined range whereby the passband center frequency of the tuned filter is mapped to the reflection response; andan attenuator coupled to the input of the tuned filter attenuating the transmitted signal.