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US 7,292,101 B2Granted
Digitally adjustable variable gain amplifier (VGA) using switchable differential pairs
AssigneeBroadcom Corporation
InventorsNamik Kemal Kocaman, Afshin Momtaz
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Abstract
A variable gain amplifier including a stage. The stage having a set of switchable differential pairs. The stage providing a gain range to a signal and adjusting a gain of the signal. At least one differential pair in each stage is permanently enabled. The variable gain amplifier may include a plurality of cascaded stages including the stage. In addition, the variable gain amplifier may be adjusted through an interleaved thermometer coding method.
Claims8
A variable gain amplifier comprising:
- a stage comprising a set of permanently enabled differential pairs and a set of switchable differential pairs, the stage providing a gain range to a signal and adjusting a gain of the signal;
- and
- a constant current source electrically coupled to both the set of permanently enabled differential pairs and the set of switchable differential pairs,
- wherein the set of switchable differential pairs comprises a number N of switched-on differential pairs, and
- wherein the variable gain amplifier is configured to increase the number N of switched-on differential pairs, wherein N is greater or equal to 1 as the gain of the signal increases.
2 more elements
Dependencies are inferred from the claim text.