Stepped signal generating circuit
US5166540A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 12, 1990 |
| Grant date | Nov 24, 1992 |
| Priority date | — |
| Expiry date | Dec 12, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K4/026
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The present invention discloses a stepped signal generating circuit for producing stepped signals having nearly perfect sinusoidal stepped signals. The stepped signal generating circuit comprises a plurality of current mirror switching sections, each having a P type and an N type current mirror for outputting constant currents upon receiving digital signals. N-MOS transistors are provided to pass or block the output current of each switching section. The constant currents outputted from the switching sections are then controlled by a constant voltage of the constant voltage source. The final output is controlled by a constant current of a constant current source before being outputted. Accordingly, the present invention generates precise and nearly sinusoidal stepped signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.