N-bit pulse width modulated signal generator
US5880644A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 1997 |
| Grant date | Mar 9, 1999 |
| Priority date | — |
| Expiry date | Nov 4, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K7/08
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A pulse width modulated signal generator is comprised of an N-bit ripple counter (12) that generates a down counted output value which is input to a combinatorial logic circuit for generating a pulse width that is defined as a predetermined number of clock cycles from a clock that is utilized to clock the ripple counter (12). The ripple counter (12) is cycled from a maximum value to a minimum value with the value "0000" inhibited. This count value is combined with a plurality of AND gates which also receive as an input an enable value from a input (18). When the ripple counter (12) is initiated at its maximum value, the output is pulled high and then a predetermined number of the clock pulses counted, as defined by the value of the enable word. Thereafter, the output is pulled low to define the length of the pulse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.