Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1994-09-29
1996-02-20
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330253, 330261, H03F 345
Patent
active
054932530
ABSTRACT:
In an integrated circuit having first (VDD) and second (GND) power terminals, a differential amplifier has a load end connected to the first power terminal to produce-in response to an input signal (IN(1)-IN(2)) an output signal (OUT(1)-OUT(2)) when a common connected end of the amplifier is connected through an n-type constant current transistor (19) to the second power terminal. Connected between the power terminals, a bias resistor (25) and an n-type bias transistor (27) produces a bias circuit output voltage for comparison with a reference voltage (REF) by a voltage comparator (29) for producing a difference voltage which is delivered to a constant current transistor gate electrode and fed back to a bias transistor gate electrode to keep an amplitude of the output signal constant against a temperature variation. It is possible to use as the reference voltage a divided voltage of a source voltage supplied between the power terminals. If p-type transistors are used, the source voltage should have a reversed polarity.
REFERENCES:
Le, "Autobiasing and Dynamic Range Maximazation in a Greyscale Differential Amplifier", IBM Technical Disclosure Bulletin, vol. 27, No. 1A Jun. 1984, pp. 164-165.
Mullins James B.
NEC Corporation
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