Impedance matched variable gain low noise amplifier using shunt feed-back
US7724085B2 · kind B2 · utility
1Cited by
13References
15Claims
0Family size
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Key dates
| Filing date | Nov 20, 2007 |
| Grant date | May 25, 2010 |
| Priority date | — |
| Expiry date | Feb 28, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/56
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The variable gain amplifier includes a forward path that provides the amplifier variable gain, and a feedback path. The feedback path uses a switch that is turned on at low gain levels. The switch taps into the feedback resistor, shunting it to signal-ground and eliminating the feedback mechanism. This ensures that the input impedance seen at the input port does not grow excessively, using part of the feedback resistor as a passive termination at low gain levels. In this way variable gain ranges in excess of 30 dB can be achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.