| US 7,613,442 B1 | ||
| Switch circuit and method of switching radio frequency signals | ||
| Dylan J. Kelly, San Diego, Calif. (US); Mark L. Burgener, San Diego, Calif. (US); and James S. Cable, Del Mar, Calif. (US) | ||
| Assigned to Peregrine Semiconductor Corporation, San Diego, Calif. (US) | ||
| Filed on May 11, 2005, as Appl. No. 11/127,520. | ||
| Claims priority of provisional application 60/571220, filed on May 14, 2004. | ||
| Claims priority of provisional application 60/328353, filed on Oct. 10, 2001. | ||
| Int. Cl. H04B 1/28 (2006.01); H01L 29/76 (2006.01); H04Q 7/20 (2006.01); H04M 1/00 (2006.01) | ||
| U.S. Cl. 455—333 [455/425; 455/550.1; 257/341; 323/220; 323/234; 323/271; 323/274] | 11 Claims |
| 1. An improved voltage reduction circuit adapted to limit voltage levels within an electric circuit, wherein the voltage reduction
circuit has an input voltage incident at an input node, an output voltage incident at an output node, and includes a plurality
of MOSFET transistors, comprising:
a) a series MOSFET transistor, wherein the series MOSFET transistor has a drain connected to the input node, a gate connected
to circuit ground, and a source connected to the output node, and wherein the series MOSFET transistor has a first threshold
voltage; and
b) a shunt MOSFET transistor, wherein the shunt MOSFET transistor has a drain connected to the output node, a gate connected
to the input node, a source connected to ground, and wherein the shunt MOSFET transistor has a second threshold voltage.
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