发明授权
- 专利标题: Receiver circuit compensation for filter response error
- 专利标题(中): 接收器电路补偿滤波器响应误差
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申请号: US09815203申请日: 2001-03-22
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公开(公告)号: US06847811B2公开(公告)日: 2005-01-25
- 发明人: Andreas Hofmann
- 申请人: Andreas Hofmann
- 申请人地址: DE Munich
- 专利权人: Infineon Technologies AG
- 当前专利权人: Infineon Technologies AG
- 当前专利权人地址: DE Munich
- 代理商 Laurence A. Greenberg; Werner H. Stemer; Ralph E. Locher
- 优先权: DE00106267 20000322
- 主分类号: H03D7/00
- IPC分类号: H03D7/00 ; H03D7/16 ; H03J3/04 ; H03J7/04 ; H04B1/04 ; H04B1/26
摘要:
A circuit configuration having a filter, for example a bandpass filter, and a method for its operation are specified, which the circuit configuration allows for compensation of a frequency error, for example between an actual mid-frequency and a nominal frequency. A first mixer, upstream of the filter and a second mixer downstream from the filter are provided. A signal and a respective oscillation frequency are each supplied to respective inputs of the first and second mixers. The oscillation frequencies are mixed as a function of the frequency error in frequency generators such that the signal at the intermediate frequency is matched to the filter characteristics of the filter which is subject to tolerances. In consequence, filters that satisfy the stringent requirements for WCDMA mobile radio applications, but by virtue of the manufacturing technique, have an excessive mid-frequency error, can be used, for example, in heterodyne receivers.
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