OUTPUT IMPEDANCE-MATCHING NETWORK HAVING HARMONIC-PREVENTION CIRCUITRY

摘要

An output impedance-matching network for an RF power amplifier die includes a harmonic-prevention circuit that functions like a short circuit at a fundamental frequency of the amplifier and an open circuit at a second harmonic frequency of the amplifier. In certain implementations, the harmonic-prevention circuit has one or more parallel, reactive (LC) legs that resonate at the fundamental frequency and a parallel, reactive (capacitive) leg that causes the harmonic-prevention circuit to resonate at the second harmonic frequency. The harmonic-prevention circuit improves power transfer and efficiency of the RF power amplifier.

主权项

1. An article of manufacture including an amplifier, comprising:
active circuitry; and an output impedance-matching network connecting an output of the active circuitry to an output node of the amplifier to provide a desired output impedance for the amplifier, wherein the output impedance-matching network comprises a harmonic-prevention circuit that functions as (i) a short circuit at a fundamental frequency of the amplifier and (ii) an open circuit at a second harmonic of a fundamental frequency of the amplifier.