Supply voltage independent Schmitt trigger inverter
US8766692B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 2010 |
| Grant date | Jul 1, 2014 |
| Priority date | — |
| Expiry date | May 3, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K3/3565
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A Schmitt trigger inverter circuit can include a first inverter. The first inverter can include a first pull-up device, a first pull-down device and a second pull-down device. The first inverter can receive an input signal. The Schmitt trigger inverter circuit can include a second inverter coupled in series with the first inverter and including an output that generates an output signal. The Schmitt trigger inverter circuit further can include a switch coupled to the output of the second inverter circuit and that is selectively enabled by the output signal. The switch can couple a predetermined reference voltage to a source terminal of the first pull-down device when in an enabled state. Coupling the predetermined reference voltage to the source terminal of the first pull-down device can alter a threshold voltage of the Schmitt trigger inverter circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.