发明名称 |
Bi-quad calibration |
摘要 |
Embodiments include methods of tuning state variable filters. Examples include state variable filters whose center frequencies can be tuned using variable gain blocks coupled to outputs of filter integrators. First- and second-order state variable filters may operate on signals in parallel and their outputs combined to produce a filtered output. Filters may be tuned to pass or reject signals depending on the application; sample applications include, but are not limited to: agile filtering; spectrum analysis; interference detection and rejection; equalization; direct intermediate-frequency transmission; and single-sideband modulation and demodulation. |
申请公布号 |
US9407240(B2) |
申请公布日期 |
2016.08.02 |
申请号 |
US201314017850 |
申请日期 |
2013.09.04 |
申请人 |
Spero Devices, Inc. |
发明人 |
Gupta Dev V. |
分类号 |
H03H17/02;H03H11/12;H03H11/04 |
主分类号 |
H03H17/02 |
代理机构 |
Hamilton, Brook, Smith & Reynolds, P.C. |
代理人 |
Hamilton, Brook, Smith & Reynolds, P.C. |
主权项 |
1. A method of tuning a filter of a biquad circuit, the biquad circuit comprising analog circuit components including a loss pad, a first integrator, and a second integrator, the method comprising:
tuning the loss pad to generate a target gain value at a predetermined frequency; tuning a phase of the first integrator to a target phase at the predetermined frequency; tuning a phase of the second integrator to the target phase at the predetermined frequency; and tuning a gain of the first integrator to the target gain value at the predetermined frequency; and tuning a gain of the second integrator to the target gain value at the predetermined frequency; wherein each tuning step comprises changing circuit values. |
地址 |
Acton MA US |