Square wave/sine wave conversion
US4250455A · kind A · utility
6Cited by
4References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 25, 1978 |
| Grant date | Feb 10, 1981 |
| Priority date | — |
| Expiry date | Aug 25, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B28/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A square wave to sine wave converter using a low-pass filter. The cut-off frequency of the filter is variable in accordance with the frequency of the square wave applied to it. This is achieved by the effective value of a frequency-determining impedance in the filter varying with the square wave frequency. A resistor is switched in and out of circuit at a rate which is at least a multiple of 100 of the square wave frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.