| US 7,560,994 B1 | ||
| Systems and methods for cascode switching power amplifiers | ||
| Ockgoo Lee, Atlanta, Ga. (US); Jeonghu Han, Atlanta, Ga. (US); Kyu Hwan An, Dunwoody, Ga. (US); Hyungwook Kim, Atlanta, Ga. (US); Dong Ho Lee, Atlanta, Ga. (US); Ki Seok Yang, Atlanta, Ga. (US); Chang-Ho Lee, Marietta, Ga. (US); Haksun Kim, Daejeon (Korea, Republic of); and Joy Laskar, Marietta, Ga. (US) | ||
| Assigned to Samsung Electro-Mechanics Company, (Korea, Republic of); and Georgia Tech Research Corporation, Atlanta, Ga. (US) | ||
| Filed on Jan. 03, 2008, as Appl. No. 11/968,852. | ||
| Int. Cl. H03F 3/04 (2006.01) | ||
| U.S. Cl. 330—311 [330/310] | 16 Claims |
| 1. A system for a power amplifier, comprising:
a first common-source device having a first source, a first gate, a first drain, and a first body, wherein the first source
is connected to the first body, and wherein the first gate is connected to an input port;
a second common-gate device having a second source, a second gate, a second drain, and a second body, wherein the second source
is connected to the first drain, wherein the second source is further connected to the second body, and wherein the second
drain is connected to an output port, wherein the first common-source device provides a first output capacitance defined by
the sum of a gate-to-source capacitance of the second common-gate device and a drain-to-body capacitance of the first common-source
device, and wherein the second common-gate device provides a second output capacitance defined by a drain-to-body capacitance
of the second common-gate device; and
a load network connected to the output port, wherein the load network comprises a series combination of a capacitor, an inductor,
and a resistor, wherein the first output capacitance and the second output capacitance are sized to operate with the load
network in order to provide a Class-E switching condition.
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