Polar leapfrog filter
US5293086A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1992 |
| Grant date | Mar 8, 1994 |
| Priority date | — |
| Expiry date | Mar 26, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H11/045
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A polar leapfrog filter includes at least one polar network. The polar network comprises a differentiator constituted by an operational amplifier having input and output terminals, and a first integrator formed by a first capacitor for providing negative feedback to the operational amplifier and a first variable transconductance amplifier; and a second integrator formed by a second capacitor for providing negative feedback to the first integrator, and a second variable transconductance amplifier. An integrator is provided at each of the input and output stages, and a third integrator is provided immediately preceding the output side integrator. In the case where two or more said polar networks are incorporated, an additional integrator is provided between the polar networks. The total number of all the circuits is selected to be even and equal to the order of the filter. The adjacent ones of the circuits are connected in such a manner that leapfrog type negative feedback is effected, and only the input side integrator is constructed in the form of self negative feedback type.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.