Push-pull amplifier output circuit

Details Push-pull amplifier output circuit Push-pull amplifier output circuit

1978-03-17

1979-09-11

Dahl, Lawrence J.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330302, 330306, H03F 326

Patent

active

041677099

ABSTRACT:
A high frequency push-pull amplifier which includes an improved output circuit to eliminate spurious emissions, typically low frequency parametric oscillations. The output circuit includes a low pass filter with an inductive input so as to avoid a series resonance to any harmonic of the desired output signal of the amplifier. A resistive termination is provided to any of the in phase signal components between the push-pull amplifier and the low pass filter. Also, to inhibit any tendency towards parametric oscillations, the variation in output capacitance with respect to collector voltage of the transistors is minimized by placing a capacitor in parallel with the collector capacitance, which is several times the collector to emitter capacitance of the transistors at their normal collector voltage.

REFERENCES:
patent: 3652948 (1972-03-01), Fierstien et al.
patent: 3821655 (1974-06-01), Fisher

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