System and method for establishing a bias current using a feedback loop
US6922556B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 30, 2002 |
| Grant date | Jul 26, 2005 |
| Priority date | — |
| Expiry date | Oct 17, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45318
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit for establishing a bias current includes a mixer, an amplifier, a bias resistor, a comparator, and a drive circuit. The mixer receives a drive voltage and at least a portion of a bias current. The amplifier is coupled to the mixer and receives at least a portion of the bias current. A bias resistor is coupled to the amplifier at a node and a bias voltage exists at the node. The comparator is coupled to the node and compares the bias voltage with a reference voltage. The comparator further generates an output signal based at least in part upon the comparison. The drive circuit generates the drive voltage in response to the output signal such that the bias voltage substantially equals the reference voltage thereby establishing the bias current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.