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

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United States of America Patent

PATENT NO 8862089
APP PUB NO 20130040595A1
SERIAL NO

13655264

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Abstract

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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 (104) includes a variable capacitance (146) which is adjusted by a tuning signal (160). A negative resistance element (144) and the pre-filter (104) may form an oscillator. The negative resistance element (144) is controlled by an amplitude control signal (162) outputted from an oscillation amplitude control circuit (142). The oscillation amplitude control circuit (142) stabilizes the amplitude of a radio frequency signal (130) in a preset range. An oscillation frequency control circuit (140) stabilizes the frequency of the signal (130) in a preset frequency range by a tuning signal (160). The tuning is completed until both of the amplitude and the frequency of the oscillation signal meet the preset ranges.

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Patent Owner(s)

Patent OwnerAddress
KT MICRO INCBUILDING 4 23 YUQUANSHAN ROAD HAIDIAN DISTRICT BEIJING BEIJING CITY BEIJING CITY 100000

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chen, Dianyu Beijing, CN 3 9
Li, Zhen Beijing, CN 370 1800
Lin, Haiqing Ladera Ranch, US 17 232
Liu, Zhongzhi Beijing, CN 6 86
Wang, Han Beijing, CN 213 1423
Xiang, Yihai Rancho Santa Margarita, US 7 33
Yang, Pei Beijing, CN 33 31
Yang, Yi Beijing, CN 315 8219

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