Invention Grant
- Patent Title: Non-inverting amplifier circuit, semiconductor integrated circuit, and phase compensation method of non-inverting amplifier circuit
- Patent Title (中): 非反相放大电路，半导体集成电路和非反相放大电路的相位补偿方法
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Application No.: US12753624Application Date: 2010-04-02
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Publication No.: US07986188B2Publication Date: 2011-07-26
- Inventor: Atsushi Fujiwara
- Applicant: Atsushi Fujiwara
- Applicant Address: JP Tokyo
- Assignee: Elpida Memory, Inc.
- Current Assignee: Elpida Memory, Inc.
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2009-091327 20090403
- Main IPC: H03F1/14
- IPC: H03F1/14
Abstract:
A circuit includes a differential amplifier unit that receives an input signal at a non-inverting input thereof, a constant current source, a load circuit, an output transistor that receives an output of the differential amplifier unit as an input and drives a load circuit, a phase compensation circuit including a variable resistor and a capacitor connected in series between the input of the output transistor and a feedback path, an output current monitor circuit that detects an output current flowing through the output transistor, and a bias voltage generation circuit that varies a resistance value of the variable resistor in accordance with a result of the detection of the output current by the output current monitor circuit. A signal obtained by voltage dividing an output of the output transistor by resistors is supplied to an inverting input of the differential amplifier unit.
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