Class AB complementary output stage

Details Class AB complementary output stage Class AB complementary output stage

1994-08-15

1995-12-12

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330267, H03F 326

Patent

active

054753430

ABSTRACT:
A class AB complementary output stage provides maximum output voltage swings and high load currents with minimum power dissipation. The output stage includes a first bias circuit that generates a pair of voltage nodes with a resistor controlled bias current. A second bias circuit comprises four current sources the outputs of which are coupled pair-wise across a resistor to form a pair of high impedance nodes at the resistor terminals. The voltage nodes of the first bias circuit establish bias currents in a differential input stage and in a pair of current sources of the second bias circuit. The outputs of the differential input stage drive the inputs of second pair of current sources in the second bias circuit, which provide drive current to the high impedance nodes. The output circuit comprises a pair of complementary common source transistors, the gates (bases) of which are driven by the high impedance nodes of the second bias circuit.

REFERENCES:
patent: 5113148 (1992-05-01), Theus
patent: 5363059 (1994-11-01), Thiel

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