Operational amplifier

Details Operational amplifier Operational amplifier

2008-06-24

2008-06-24

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S261000

Reexamination Certificate

active

07391263

ABSTRACT:
An operational amplifier1is provided with differential amplifier2, replica amplifier3, voltage-current converting circuit4, reference current source5and comparator6. Differential amplifier2includes P-channel MOS transistors PT1and PT2, gate and drain electrodes of which are connected to each other to function as loads, and N-channel MOS transistors NT1, NT2and NT3. Replica amplifier3is identical in structure to differential amplifier and also includes P-channel MOS transistors PT11and PT12, gate and drain electrodes of which are connected to each other to function as loads, and N-channel MOS transistors NT11, NT12and NT13. Voltage-current converting circuit4converts output voltages of replica amplifier3to current Irep. Comparator6compares output current Irep of voltage-current converting circuit4with reference current Iref of reference current source5and supplies compared current Ico to differential amplifier2to keep bias current Ibias of differential amplifier2constant.

REFERENCES:
patent: 7042289 (2006-05-01), Hwang et al.
patent: 2000-278053 (2000-10-01), None
R. Jacob Baker, et al., Circuit Design, Layout, and Simulation, IEEE Press Series on Microelectronic Systems, pp. 96-99.

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