Class AB amplifier allowing quiescent current and gain to be set

Details Class AB amplifier allowing quiescent current and gain to be set Class AB amplifier allowing quiescent current and gain to be set

1994-11-22

1996-04-30

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H03F 345

Patent

active

055128572

ABSTRACT:
Topologies for Class AB amplifiers which have reduced quiescent power consumption are disclosed. An exemplary amplifier according to the present invention comprises two transconductance amplifying cells, each having an output transistor. Each output transistor is biased such that it conducts a small quiescent current which is preferably sufficient in magnitude to reduce amplifier distortion. The class AB amplifiers are well suited for low power supply voltage applications, such as hearing aids.

REFERENCES:
patent: 4321428 (1982-03-01), Seki
patent: 4378530 (1983-03-01), Garde
patent: 4868517 (1989-09-01), Waldhauer et al.
patent: 4882762 (1989-11-01), Waldhauer
patent: 5278912 (1994-01-01), Waldhauer
patent: 5285172 (1994-02-01), Okanobu et al.

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