VCO insensitive to power supply ripple
US8604884B2 · kind B2 · utility
7Cited by
7References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 30, 2011 |
| Grant date | Dec 10, 2013 |
| Priority date | — |
| Expiry date | Jun 30, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K3/0315
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A ring oscillator that is more insensitive to power supply ripple utilizes an amplifier circuit having a first input coupled to a reference voltage. A current is generated that represents a control voltage supplied to the oscillator control circuit. That current is mirrored and supplied as a control current to the oscillator. An amplifier is used in a feedback loop to ensure that incremental variations in source to drain voltage of a first transistor of the current mirror is present in a second transistor of the current mirror to make the control current more immune to supply ripple.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.