Circuit technique for cancelling non-linear capacitor-induced ha

Details Circuit technique for cancelling non-linear capacitor-induced ha Circuit technique for cancelling non-linear capacitor-induced ha

1989-11-06

1991-03-12

Mullins, James B.

Modulators

Amplitude modulator

330288, 330307, H03F 132

Patent

active

049995855

ABSTRACT:
Circuitry for reducing harmonic distortion in an amplifier includes a first transistor having a first non-linear collector-to-substrate capacitance, a first load device coupled to a collector of the first transistor, a first current source coupled to an emitter of the first transistor, a first conductor conducting an input voltage coupled to a base of the first transistor, and a second conductor coupled to the first load device and conducting an output voltage of the amplifier. The first transistor produces a first non-linear current in the first non-linear collector-to-substrate capacitance in response to the input voltage. A second transistor has a second non-linear collector-to-substrate capacitance. A second current source is coupled to an emitter of the second transistor. The first conductor is coupled to apply the input voltage to a base of the second transistor. The second transistor produces a second non-linear current in the second non-linear collector-to-substrate capacitance in response to the input voltage. A current mirror receives a collector current of the second transistor. The current mirror produces in the second conductor a correction signal substantially equal and opposite to the first non-linear current.

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