Method for terminating harmonics of transistors

Details Method for terminating harmonics of transistors Method for terminating harmonics of transistors

1992-10-01

1994-04-05

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including class d amplifier

330306, H03F 3193

Patent

active

053008952

ABSTRACT:
Generally, and in one form of the invention, a method is disclosed for terminating third harmonic frequency of a transistor amplifier comprising: determining the magnitude of the susceptance at the third harmonic frequency of initial circuitry, 41, 43, and 45, attached to the output of a transistor 39, wherein the initial circuitry has no third harmonic termination; determining whether the susceptance of the circuitry presented to the output of the transistor 39 is capacitive or inductive at the third harmonic frequency; and adding a compensating parallel susceptance 60 to the output of the transistor 39 that is substantially equal in magnitude to the susceptance of the circuitry attached to the output of the transistor 39, but capacitive if the susceptance of the circuitry presented to the output of the transistor 39 is inductive, or inductive if the susceptance presented to the output of the transistor 39 is capacitive, whereby the imaginary part of the susceptance of the total circuitry attached to the output of the transistor 39 is made small at the third harmonic frequency.

REFERENCES:
patent: 5146178 (1992-09-01), Nojima et al.

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