Method and apparatus of a self-biased RC oscillator and ramp generator
US9287823B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 15, 2014 |
| Grant date | Mar 15, 2016 |
| Priority date | — |
| Expiry date | Sep 15, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K4/06
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A self-biased RC (resistor-capacitor) oscillator and ramp generator circuit includes a combined current and voltage reference circuit for providing a reference current, a first reference voltage, and a second reference voltage. The combined current and voltage reference circuit includes a circuit branch of an NMOS transistor in a diode connection, a PMOS transistor in a diode connection, and a resistor coupled in series. The circuit also has a signal generating circuit that includes a capacitor. The signal generating circuit is configured to charge and discharge the capacitor between the first reference voltage and the second reference voltage. The self-biased RC oscillator and ramp generator circuit is configured to provide a ramp or saw tooth signal at a node of the capacitor and to provide an oscillator output signal at an output of the signal generating circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.