Capacitive Cross-Coupling and Harmonic Rejection

摘要

A power amplifier of the present invention comprises a first cascode including a MOSFET and a JFET and a first capacitor electrically connected between the source and the drain of the JFET. Two such power amplifiers in parallel form a differential power amplifier. In the differential amplifier a second capacitor can be electrically connected between the source and the drain of the second JFET. Another differential power amplifier comprises a first capacitor electrically connected between the gate of the first MOSFET and the source of the second MOSFET, and a second capacitor electrically connected between the gate of the second MOSFET and the source of the first MOSFET. Some of these differential power amplifiers also include capacitors electrically connected between the sources and the drains of the JFETs.

主权项

1. A power amplifier comprising:
a first cascode including
a first MOSFET having a source, a drain, and a gate, anda first JFET having a source, a drain, and a gate,the drain of the first MOSFET being coupled to the source of the first JFET; a first capacitor electrically connected between the source of the first JFET and the drain of the first JFET; a second cascode including
a second MOSFET having a source, a drain, and a gate, anda second JFET having a source, a drain, and a gate,the drain of the second MOSFET being coupled to the source of the second JFET; and a second capacitor electrically connected between the source of the second JFET and the drain of the second JFET.