Self biased low noise high PSRR constant GM for VCO
US7667533B1 · kind B1 · utility
8Cited by
4References
20Claims
0Family size
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Key dates
| Filing date | Oct 24, 2006 |
| Grant date | Feb 23, 2010 |
| Priority date | — |
| Expiry date | Mar 4, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/099
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A system and method for voltage controlled oscillator (VCO) biasing in low voltage circuits including low resistance elements that are especially susceptible to noise. In one embodiment, a poly resistor and triode resistor is used to cancel or offset the effects that temperature variations have on the circuit. The triode resistor is powered by a voltage source that uses a pair of diodes coupled to a constant transconductance (gm) circuit to generate a reduced noise voltage that is independent of the power supply noise. The size of the triode resistor and poly resistors can be varied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.