| US 7,468,636 B2 | ||
| Radio frequency power amplifier | ||
| Shingo Matsuda, Kyoto (Japan); Kazuki Tateoka, Kyoto (Japan); and Hirokazu Makihara, Osaka (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Filed on Dec. 19, 2006, as Appl. No. 11/640,866. | ||
| Claims priority of application No. 2005-369503 (JP), filed on Dec. 22, 2005. | ||
| Prior Publication US 2007/0146077 A1, Jun. 28, 2007 | ||
| Int. Cl. H03F 3/191 (2006.01) | ||
| U.S. Cl. 330—302 [330/310] | 1 Claim |
| 1. A radio frequency power amplifier including transistors for performing non-linear amplification connected in a plurality
of stages, the radio frequency power amplifier comprising:
a former-stage transistor including a base to which a signal is input;
a latter-stage transistor including a collector from which the signal is output; and
an inter-stage matching circuit for connecting a collector of the former-stage transistor and a base of the latter-stage transistor;
wherein the inter-stage matching circuit includes:
a high-pass filter circuit; and
an impedance conversion device having an inductor and a capacitor connected in parallel, and
wherein the impedance conversion device increases a phase shift of a second harmonic signal.
|