| US 7,539,471 B2 | ||
| Method and apparatus to provide variable gain in a radio receiver front end | ||
| Jing-Hong C Zhan, Hillsboro, Oreg. (US); and Stewart S. Taylor, Beaverton, Oreg. (US) | ||
| Assigned to Intel Corporation, Santa Clara, Calif. (US) | ||
| Filed on Mar. 30, 2006, as Appl. No. 11/394,798. | ||
| Prior Publication US 2007/0238431 A1, Oct. 11, 2007 | ||
| Int. Cl. H04B 1/18 (2006.01); H04B 1/28 (2006.01) | ||
| U.S. Cl. 455—130 [455/232.1; 455/293; 455/333] | 24 Claims |
| 1. A wireless receiver comprising:
a low noise amplifier (LNA) having a controllable gain to amplify a receive signal; and
a mixer having a controllable gain to perform a frequency conversion on a signal output from said LNA;
wherein said LNA includes:
first and second transistors connected in a cascode arrangement, wherein a first drain/source terminal of said second transistor
is connected to an output node of said LNA;
third and fourth transistors connected in a cascode arrangement, wherein a first drain/source terminal of said fourth transistor
is connected to said output node of said LNA; and
a first switch to controllably couple a gate terminal of said second transistor to a gate terminal of said fourth transistor.
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