Differential impedance neutralization circuit

Details Differential impedance neutralization circuit Differential impedance neutralization circuit

1986-10-14

1987-09-08

Wan, Gene

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330149, H03F 345, H03F 126

Patent

active

046927123

ABSTRACT:
An impedance neutralization circuit produces correction currents to compensate for the effects of parasitic impedance on the output voltage of an amplifier. In the described embodiment, the neutralization circuit includes a pair of emitter followers, one coupled to the collector of each transistor of a common base amplifier for sensing the output voltage at each collector. A pair of transistors are coupled one to each emitter follower for applying the sensed voltage across a neutralizing impedance proportional to the parasitic impedance seen at the collector of the opposite transistor of the common base amplifier. The voltage applied across the neutralizing impedances produces a correction current. The correction current is summed with a distortion current of proportional amount but opposite sign produced by the output voltage applied across the parasitic impedance to produce a substantially error-free output voltage.

REFERENCES:
patent: 4476440 (1984-10-01), Bennett

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