OPERATIONAL AMPLIFIER

WIPO Patent Application WO/2014/087980

A1

Provided is an operational amplifier capable of operating without generating a region in which a circuit does not operate and reducing the gain of the circuit even when operating voltage is decreased. High-pass filters (102-105) bias and set input nodes of differential amplifiers (Gm1-Gm4) to potentials within a common mode range in which the respective differential amplifiers (Gm1-Gm4) become operable by the output signals thereof. Consequently, it becomes possible to effectively operate the respective differential amplifiers (Gm1-Gm4) even when the power supply voltage has decreased, and a normal amplification operation becomes possible. Further, no reduction in gain due to a decrease in operating voltage occurs. Accordingly, the use thereof for the purpose of mounting a digital circuit and an analog circuit in a mixed manner on the same integrated circuit chip is suitable. When high-pass filters are required on the respective input sides of differential amplifiers of two or more stages, a phase compensation method by a plurality of paths is provided to low frequencies of a phase margin generated on the low-frequency side, thereby enabling a normal amplitude operation.

WO/2022/125163

ANALOG CIRCUIT DIFFERENTIAL PAIR ELEMENT MISMATCH DETECTION USING SPECTRAL SEPARATION

OUCHI SHINICHI (JP)

PCT/JP2013/082408

June 12, 2014

December 03, 2013

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NAT INST OF ADVANCED IND SCIEN (JP)

H03F3/393; H03F3/34; H03F3/38

JP2006511125A	2006-03-30
JP2010539793A	2010-12-16
US20080180278A1	2008-07-31
JP2010517472A	2010-05-20
JPH06224659A	1994-08-12

SHIMIZU MAMORU (JP)
Spring water 守 (JP)

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