Apparatus and method for dynamic DC offset detection and cancellation using high pass filter with variable impedance and corner frequency
US7184736B2 · kind B2 · utility
2Cited by
2References
18Claims
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Key dates
| Filing date | Mar 5, 2004 |
| Grant date | Feb 27, 2007 |
| Priority date | — |
| Expiry date | Mar 15, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/375
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A fixed impedance in parallel with a variable impedance form a high pass filter with a capacitor. An input signal is provided to the capacitor. The value of the variable impedance is controlled in relation to the magnitude of a dynamic DC offset in the input signal to control the corner frequency of the high pass filter, providing a higher corner frequency and more rapid suppression of dynamic DC offset for larger dynamic DC offset magnitudes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.