Amplifiers – With control of power supply or bias voltage
Reexamination Certificate
2008-09-02
2008-09-02
Lee, Benny (Department: 2817)
Amplifiers
With control of power supply or bias voltage
C330S085000
Reexamination Certificate
active
11650951
ABSTRACT:
An amplifier has an input stage amplifying circuit, an output stage amplifying circuit, and a negative feedback circuit. The input stage amplifying circuit differential-amplifies a first input voltage inputted to a positive phase input node and a second input voltage inputted to an opposite phase input node, and outputs from a positive phase output node. The output stage amplifying circuit amplifies output voltage from a node and outputs it from an output terminal, and generates the second input voltage corresponding to output voltage and feedback-inputs it to the opposite phase input node. The negative feedback circuit has a first PMOS for a current source whose output current fluctuates due to output voltage of the positive phase output node, and a differential amplifying section to which the output current of the first PMOS is supplied and which is formed from a second and third PMOS which differential-amplify the first input voltage and the second input voltage. The negative feedback circuit feeds-back, to an opposite phase output node, a positive phase current corresponding to output current of the differential amplifying section.
REFERENCES:
patent: 6066985 (2000-05-01), Xu
patent: 6566952 (2003-05-01), Allan
patent: 2003-330550 (2003-11-01), None
patent: 2004-118411 (2004-04-01), None
Lee Benny
Nguyen Hieu P
Volentine & Whitt P.L.L.C.
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