Dynamic biasing for class A amplifier

Amplifiers – With semiconductor amplifying device – Including differential amplifier

Patent

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Details

330273, H23F 330

Patent

active

051666367

ABSTRACT:
A Class A amplifier has a balanced input circuit including first and second input transistors to receive inverting and non-inverting inputs and to provide an output signal on the collector of the first input transistor. First and second load transistors are associated with the input transistors, the bases of the load transistors being connected to the collector of the second input transistor. An output circuit has source and sink output NPN transistors connected to receive the output signal from the first input transistor, and a circuit is provided for dynamically biasing at least one sink output transistor to have a minimum biasing current in a quiescent state, and increased biasing current in a current sink state. The circuit for dynamically biasing the output transistors has a pair of bias NPN transistors with their collector-emitter paths connected in series, and with the base of one connected to receive the output of the first input transistor. The base of the other bias transistors is connected to the emitter of the one bias transistor and to the base of the sink output transistor. The first and second bias transistors are sized to balance the load seen by the first and second input transistors.

REFERENCES:
patent: 4442409 (1984-04-01), Preslar

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