Operational amplifier including low DC gain wideband feed...

Active solid-state devices (e.g. – transistors – solid-state diode – Regenerative type switching device – With integrated trigger signal amplification means

Reexamination Certificate

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C257S115000, C257S123000, C257S157000, C257S158000, C257S160000, C327S052000, C327S089000, C327S246000, C327S247000, C327S280000, C327S287000, C327S359000, C327S563000

Reexamination Certificate

active

07453104

ABSTRACT:
In an operational amplifier including first and second power supply terminals, first and second input terminals, and a first and second output terminals, a first differential amplifier circuit includes first and second MOS transistors with a common source connected to a first tail current source, first and second load resistors and a first non-doped MOS transistor connected between the first and second resistors and the second power supply terminal. A second differential amplifier circuit includes third and fourth MOS transistors with a common source connected to a second tail current source, third and fourth load resistors and a second non-doped MOS transistor connected between the third and fourth load resistors and the second power supply terminal. A first output circuit includes a fifth MOS transistor with a gate connected to the drain of the second MOS transistor, and a sixth MOS transistor with a gate and a drain connected to the drain of the fifth MOS transistor, and a second output circuit includes a seventh MOS transistor with a gate connected to the drain of the first MOS transistor, and an eighth MOS transistor with a gate and a drain connected to the drain of the seventh MOS transistor. A first intermediate circuit is connected between the drain of the third MOS transistor and the gate of the sixth MOS transistor, and a second intermediate circuit is connected between the drain of the fourth MOS transistor and the gate of the eighth MOS transistor.

REFERENCES:
patent: 6201434 (2001-03-01), Kanda et al.
patent: 6329784 (2001-12-01), Puppin et al.
patent: 6605982 (2003-08-01), Callahan, Jr.
patent: 2003/0071673 (2003-04-01), Jordanger et al.
patent: 2004/0196096 (2004-10-01), Kondo et al.
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.
Mikko Waltari, et al., “A 220-MSample/s CMOS Sample-and-Hold Circuit Using Double-Sampling”, Analog Integrated Circuits and Signal Processing, vol. 18, pp. 21-31, 1999.

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