Amplifier circuit including compensation circuitry for canceling

Details Amplifier circuit including compensation circuitry for canceling Amplifier circuit including compensation circuitry for canceling

1998-12-04

2000-10-10

Shingleton, Michael B

Amplifiers

With semiconductor amplifying device

Including d.c. feedback bias control for stabilization

330 85, 330 96, 330 97, 330102, H03F 130

Patent

active

061305820

ABSTRACT:
An amplifier circuit (14') for canceling variations in an amplifier feedback signal includes compensation circuitry (50) defining a replica of the feedback current therethrough. The replicated feedback current is drawn from a circuit node (N1) which directs the feedback signal to a differential pair (Q1, Q2) of the amplifier circuit 14', whereby any biasing effects on the differential pair (Q1, Q2) due to changes in the feedback signal resulting from changes in a gate drive output voltage (V.sub.GD) of the amplifier circuit (14') are eliminated. Accordingly, the gate drive output voltage (V.sub.GD) may be used to control an ignition coil (L1) drive transistor (16) whereby any changes in gate drive voltage (V.sub.GD) will not cause the coil current (I.sub.L) to deviate from its target coil current limit value.

REFERENCES:
patent: 4260954 (1981-04-01), Crooks

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