Boost function for filters
US5357208A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 26, 1993 |
| Grant date | Oct 18, 1994 |
| Priority date | — |
| Expiry date | Mar 26, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H11/0433
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An integrated circuit is disclosed that includes a biquadratic filter in which the poles and zeroes are independently adjustable. The transfer function of the filter has a pair of zeroes in the numerator and a pair of complex conjugate poles in the denominator. The integrated circuit includes a first circuit for constructing the complex conjugate poles of the filter transfer function. The first circuit has an input port for receiving an input signal and an output port at which an output current representative of a filtered output signal is presented. The integrated circuit includes a second circuit for constructing, independently of the poles, the zeroes of the filter transfer function. The second circuit has an input port coupled to the input port of the first circuit for receiving the input signal. The second circuit includes a differentiator for differentiating the input signal to produce a differentiated input signal. The second circuit provides an output current that is proportional to the differentiated input signal. The output current from the second circuit is summed with the output current of the first circuit to produce the filtered output signal. Disk drive controllers t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.