Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2006-11-21
2006-11-21
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S257000
Reexamination Certificate
active
07138866
ABSTRACT:
In an operational amplifier including first and second power supply terminals, first and second input terminals, and first and second output terminals, a first differential amplifier circuit including a first drive cascode circuit and a first tail current source amplifies first and second input signals supplied to the first and second input terminals and transmits the amplified first and second input signals to the second and first output terminals, respectively, and a second differential amplifier circuit including a second drive cascode circuit and a second tail current source amplifies the first and second input signals. Also, a first circuit is connected between the first output terminal and the second power supply terminal so that the first circuit serves as an input-stage load or an output drive circuit, and a second circuit is connected between the second output terminal and the second power supply terminal so that the second circuit serves as an input-stage load or an output drive circuit. A first input-stage load circuit is connected between a first terminal of the second drive cascode circuit and the second power terminal, and a second input-stage load circuit is connected between a second terminal of the second drive cascode circuit and the second power terminal.
REFERENCES:
patent: 6583668 (2003-06-01), Liu et al.
patent: 6657495 (2003-12-01), Ivanov et al.
Germano Nicollini, et al., A Fully Differential Sample-and-Hold Circuit for High-Speed Applications, IEEE Journal of Solid-State Circuits, vol. 24, No. 5, pp. 1461-1465, Oct. 1989.
Thomas Byunghak Cho, et al., “A 10 b, 20 Msample/s, 35 mW Pipeline A/D Converter”, IEEE Journal of Solid-State Circuits, vol. 30, No. 3, pp. 166-172, Mar. 1995.
McGinn IP Law Group PLLC
NEC Electronics Corporation
Nguyen Hieu
Pascal Robert
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