Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1992-11-09
1994-05-17
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330261, H03F 345
Patent
active
053131711
ABSTRACT:
A high speed, low distortion amplifier is implemented with all npn transistors by providing a correction circuit that responds to changes in the amplifier's input voltage by substantially reducing current variations in the input stage. This is accomplished with the use of a current source resistor for the second branch of the differential input stage, together with a correction circuit that diverts a portion of the resistor's current away from the input stage's second branch. The diverted current varies negatively with the input voltage, and thus compensates for input stage current variations that would result in the absence of the correction circuit. A differential amplifier with one branch biased in response to the input voltage and the other branch held at a constant bias is preferably used to establish the correction current. The invention is applicable to open loop amplifiers, fed forward closed loop amplifiers and bootstrapped closed loop amplifiers.
REFERENCES:
patent: 4709216 (1987-11-01), Davis
patent: 4999585 (1991-03-01), Burt et al.
Grebene, Bipolar and MOS Analog Integrated Circuit Design, John Wiley & Sons, 1984, pp. 232-239.
Burns Lawrence M.
Tso Robert
Denson-Low W. K.
Gudmestad Terje
Hughes Aircraft Company
Mottola Steven
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