Switched current resistor programmable gain array for low-voltage wireless LAN and method using the same
US8229382B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 2009 |
| Grant date | Jul 24, 2012 |
| Priority date | — |
| Expiry date | May 27, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45534
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A switched current resistor (SCR) PGA for constant-bandwidth gain control includes an inverting amplifier, a feedback resistor forming a feedback loop between an output side and an input side of the inverting amplifier, and a switched current resistor (SCR) array connected in parallel to the feedback resistor, and configured to tune a gain range between a maximum and a minimum. The SCR array includes a plurality of switched resistors, each comprising a switch in series with a resistor. When the plurality of switched resistors are switched by a gain-control logic, a plurality of switched current sources and a plurality of grounded resistors are switched correspondingly to deliver a transient current, an equivalent of which flows through the plurality of grounded resistors out from the input side of the inverting amplifier, leading to a feedback factor of the PGA being constant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.