Title:
FILTER TRACKING CIRCUIT, RADIO FREQUENCY FRONT-END MODULE, AND COMMUNICATION TERMINAL
Document Type and Number:
WIPO Patent Application WO/2017/143610
Kind Code:
A1
Abstract:
Disclosed in an embodiment of the present invention is a filter tracking circuit, for use in performing filter tracking on a first signal. The filter tracking circuit comprises a multiphase switch capacitor filter and a signal detection and control circuit. The multiphase switch capacitor filter comprises an input end, an output end, and control end. The input end is used for access the first signal. The multiphase switch capacitor filter is used for filtering the first signal to obtain a second signal, and outputting the second signal from the output end. The signal detection and control circuit is electrically connected to the output end and the control end of the multiphase switch capacitor filter, and is used for detecting the strength of the second signal, and controlling the multiphase switch capacitor filter to adjust a filter central frequency and/or a 3dB bandwidth when the strength of the second signal is weaker than a reference signal strength. Also disclosed in the present invention are a radio frequency front-end module and a communication terminal. The filter tracking circuit can flexibly adjust the filter central frequency and the bandwidth.
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Inventors:
LIU RONGJIANG (CN)
LIU PEI (CN)
TANG YANGYANG (CN)
LIU PEI (CN)
TANG YANGYANG (CN)
Application Number:
PCT/CN2016/074767
Publication Date:
August 31, 2017
Filing Date:
February 27, 2016
Export Citation:
Assignee:
HUAWEI TECH CO LTD (CN)
International Classes:
H03B1/00
Foreign References:
| CN102624348A | 2012-08-01 | |||
| CN1671046A | 2005-09-21 | |||
| US7446600B2 | 2008-11-04 |
Attorney, Agent or Firm:
GUANGZHOU SCIHEAD PATENT AGENT CO., LTD. (CN)
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