Output noise control scheme for multiple I/O's
US6175598A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 1998 |
| Grant date | Jan 16, 2001 |
| Priority date | — |
| Expiry date | Mar 2, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/00361
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An output noise control circuit with significantly reduced power/ground bounce characteristics when multiple outputs thereof are being simultaneously switched is provided. The output noise control circuit includes a plurality of output buffers each being formed of an output driver stage, a first pre-driver stage, and a second pre-driver stage. Each of the output driver stages includes a pull-up drive transistor and a pull-down drive transistor. Each of the first pre-driver stages includes a first inverter, and each of said second pre-driver stages includes a second inverter. A shared pull-up resistor has its one end coupled to each of the first pre-driver stage inverters and its other end connected to a ground potential node. A shared pull-down resistor has its one end coupled to each of the second pre-driver stage inverters and its other end connected to a power supply potential node. The output noise control circuit is formed with a reduced number of circuit components than the traditional output buffer circuits currently available.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.