CMOS class AB amplifier for driving capacitive and resistive loa

Details CMOS class AB amplifier for driving capacitive and resistive loa CMOS class AB amplifier for driving capacitive and resistive loa

1994-09-30

1996-04-02

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330267, H03F 326

Patent

active

055044581

ABSTRACT:
The class AB amplifier is configured to provide low quiescent current while achieving high internal switching rates. The buffer is connected to a large external capacitance which provides external compensation. The amplifier includes an input stage which converts differential voltages to current. An output stage provides an output current and also provides a feedback current into the input stage. A biasing network provides voltage for biasing various nodes within the amplifier. Cross-coupling is provided within the output stage for achieving a low quiescent current. A pair of current limiting circuits, one for p-channel element and another for n-channel elements, is also provided.

REFERENCES:
patent: 4454479 (1984-06-01), Spires
patent: 4588961 (1986-05-01), Rao
patent: 5315266 (1994-05-01), Lorenz
Dennis M. Monticelli, A Quad CMOS Single-Supply Op Amp with Rail-to-Rail Output Swing, IEEE Journal of Solid-State Circuits, vol. sc-21, No. 6, Dec. 1986, pp. 1026-1034.

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