Constant impedance, low noise CMOS buffer
US6051995A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Sep 11, 1998 |
| Grant date | Apr 18, 2000 |
| Priority date | — |
| Expiry date | Sep 11, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/164
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A low noise CMOS buffer has been provided which includes the advantages of having a stable load impedance and a linear-ramped current waveform at the output. The buffer adds waveform shaping transistors to delay the turn on of the driver circuits, and to shape the voltage and current waveforms of the drivers. These critically placed waveform shaping transistors accomplish the function of turning off the drivers in a manner to encourage an opposite polarity linear ramp current waveform at the buffer output. A method of using waveform shaping transistors to form a stable output impedance and a linear-ramped current waveform at the output of a buffer is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.