Class AB amplifier systems

Details Class AB amplifier systems Class AB amplifier systems

2011-03-01

2011-03-01

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S257000, C330S264000

Reexamination Certificate

active

07898330

ABSTRACT:
The present invention comprises class AB amplifier systems exhibiting low quiescent power, low-voltage operation, high gain, high bandwidth, low noise and low offset, and requiring a small die area. The amplifier systems use a differential first stage and a second stage of two pair of nested current mirrors interconnected in a particular way. Using a low quiescent current, the present invention reduces power consumption almost to a theoretical minimum. Also the circuit will operate at an input of only 1.8V with a threshold voltage of 1V. Various embodiments are disclosed.

REFERENCES:
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patent: 2009/0066415 (2009-03-01), Kim
Bult, Klaas , et al., “A Fast-Settling CMOS Op Amp for SC Circuits with 90-dB DC Gain”,IEEE Journal of Solid-State Circuits, vol. 25, No. 6, (Dec. 1990), pp. 1379-1384.
“Extended European Search Report Dated Aug. 4, 2010” European Patent Application No. 10159947.0.
Griffith, Richard, et al., “A 1-V BiCMOS Rail-to-Rail Amplifier with n-Channel Depletion Mode Input Stage”,IEEE Journal of Solid-State Circuits, vol. 32, No. 12, (Dec. 1997), pp. 2012-2022.
Lehmann, Torsten, et al., “1-V Power Supply CMOS Cascode Amplifier”,IEEE Journal of Solid-State Circuits, vol. 36, No. 7, (Jul. 2001), pp. 1082-1086.

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