Class a amplifier with a digitally programmable miller compensat

Details Class a amplifier with a digitally programmable miller compensat Class a amplifier with a digitally programmable miller compensat

1996-12-02

1999-03-02

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including signal feedback means

330 76, H03F 114

Patent

active

058776540

ABSTRACT:
A class A driver circuit (30) has an output stage with a plurality of selectable current sources (42). The selectable current sources (42) are used to optimize the drive capability of the output stage of the class A driver circuit (30) for different applications having different output impedance. In one embodiment, the selectable current sources (42) may be selectable, or switchable, using software programmed by a user. In another embodiment, the current sources may be automatically selected, based on sensing the output current provided to a resistive load. Also, in yet another embodiment, the selectable current sources (42) may be selectable based on the input signal of a first stage amplifier (32). A Miller compensation network (40) includes digitally controlled, switchable capacitors (129) and resistors (128), and provides the necessary amount of Miller compensation for the selected current sources.

REFERENCES:
patent: 4500846 (1985-02-01), Lewyn et al.
patent: 4943784 (1990-07-01), Rybicki
patent: 5079514 (1992-01-01), Mijuskovic
patent: 5485121 (1996-01-01), Huijsing et al.
Paul R. Gray, et al., "Analysis and Design of Analog Integrated Circuits", 1977 by John Wiley & Sons, Inc., pp. 741-749.
Paul R. Gray, et al., "MOS Operational Amplifier Design--A Tutorial Overview", IEEE J. Solid-State Circuits, vol.SC-17, No.6, pp. 969-982, Dec. 1982.

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