Beijing Kt Micro, Ltd.

Zhongzhi Liu

Zhen Li

Pei Yang

Haiqing Lin

Dianyu Chen

Yihai Xiang

Rui Wang

Chen Wang

Jianting Wang

Han Wang

Bo Tang

Yan Qi

Rongrong Bai

Yaoli Jiang

Shizhu Chen

Xiuli Feng

A circuit for a front-end tunable filter of a communication and broadcast receiver and a tuning method thereof are described herein. In one aspect, the circuit of the tunable filter may be independent of the signal reception link of the receiver. The pre-filter () includes a variable capacitance () which is adjusted by a tuning signal (). A negative resistance element () and the pre-filter () may form an oscillator. The negative resistance element () is controlled by an amplitude control signal () outputted from an oscillation amplitude control circuit (). The oscillation amplitude control circuit () stabilizes the amplitude of a radio frequency signal () in a preset range. An oscillation frequency control circuit () stabilizes the frequency of the signal () in a preset frequency range by a tuning signal (). The tuning is completed until both of the amplitude and the frequency of the oscillation signal meet the preset ranges.

Circuit for a front-end tunable filter of a communication and broadcast receiver and a tuning method thereof

A method and device for generating an adjustable signal includes a voltage generator configured to continuously adjust an output voltage and output the voltage, a &#x3a3;&#x394; modulator configured to output a digital signal of pre-determined-cycle based on the output voltage and a reference voltage, a counter configured to count the number of a target level in the digital signal of a pre-determined number of cycles, and a digital signal generator configured to generate a target signal based on the number of the target level. The method and device may improve the accuracy of the generated signal while remaining the same feel of continuous adjustment.

Generating an adjustable signal

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Beijing, China

Zhongzhi Liu