Commutating filter passing only the fundamental frequency and odd harmonics thereof
US4518936A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 14, 1983 |
| Grant date | May 21, 1985 |
| Priority date | — |
| Expiry date | Nov 14, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H19/002
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A commutating filter circuit producing only the fundamental frequency and odd harmonics of an input signal comprises first and second commutating filters each connected to receive the input signal and coupled to pass an output signal to the non-inverting and inverting terminals, respectively, of a differential amplifier. The first filter comprises N stages, each having a time constant of RC and a filter sampling frequency of f.sub.1. The second filter comprises N/2 stages, each having a time constant of 2RC and a filter sampling frequency of 2f.sub.1. The resultant signal from the differential amplifier contains only the fundamental frequencies and odd harmonics of the input signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.