Slew rate enhancement circuit for class A amplifier

Details Slew rate enhancement circuit for class A amplifier Slew rate enhancement circuit for class A amplifier

1994-03-01

1995-05-16

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including signal feedback means

330156, H03F 138

Patent

active

054164427

ABSTRACT:
An improved Class A amplifier has an enhanced slew rate response at high frequencies. A positive feedback path is connected from the output of the amplifier to a point on the gain path. The feedback path includes a capacitor, a resistor and a transistor, the resistor being connected between the base and emitter of the transistor. At relatively high frequencies, the voltage drop across the resistor causes the transistor to turn on, forming a buffered positive feedback path through an additional resistor. The amount of feedback is controlled by the second resistor in the feedback path. In the preferred embodiment, dual feedback paths are connected between the output terminal and different points in the gain path.

REFERENCES:
patent: 4484147 (1984-11-01), Metz

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