Device and method for controlling frequency resonance point of an antenna

摘要

The present invention disclosed an apparatus and method for receiving a plurality of broadcasting signals. The apparatus comprises: a control circuit for generating an analog control voltage signal according to a frequency-voltage look-up table and a desired frequency; an antenna module comprising an antenna and an antenna resonant control circuit comprising a voltage-controlled capacitor being controlled by the analog control voltage signal, wherein the antenna resonant control circuit comprises a voltage-controlled capacitor to control the bandwidth received by the antenna according to the analog control voltage signal; a tuner for tuning a broadcasting signal received by the antenna to generate an output signal; and a demodulator for demodulating the output signal of the tuner.

主权项

1. A broadcasting signal receiving circuit, comprising:
a control circuit, for outputting a voltage control signal according to a frequency-voltage look-up table and a desired frequency; an antenna module, comprising an antenna and an antenna resonant control circuit wherein the controllable frequency range of the antenna covers at least two broadcasting frequency bands and the antenna resonant control circuit adjusts the frequency range received by the antenna according to the voltage control signal; a tuner, coupled to the antenna resonant control circuit and tuning a broadcasting signal received by the antenna to generate an output signal, wherein the tuner comprises a plurality of tuning units for separately processing broadcasting signals received by the antenna, the plurality of tuning units corresponding to different standards; and a demodulator, coupled to the tuner and demodulating the output signal of the tuner, wherein the control circuit receives a command originating in an application layer, the command specifying a desired broadcasting signal in a specific channel to be received and processed by the broadcasting signal receiving circuit, wherein the control circuit controls the antenna module to adjust frequency resonance point of the antenna in response to the command.