Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1996-06-12
1998-01-13
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330255, 330267, 330271, 330273, H03F 330
Patent
active
057083932
ABSTRACT:
A current sourcing output stage for a high voltage operational amplifier receives a low voltage input signal (V.sub.IN) and provides a high current output signal corresponding to the low voltage input signal at an output terminal (8). A first PNP transistor (Q1) is coupled between a voltage supply (V.sub.CC) and a plurality of cascaded PNP transistors (Q2, Q3, Q8-Q11) coupled to the output terminal (8). The base of the first PNP transistor (Q1) is coupled to receive the input signal (V.sub.IN) and the bases of the cascaded PNP transistors are coupled to receive different bias voltages A control circuit (Q5-Q7, R1-R5) is coupled to the voltage supply (V.sub.CC) and has an input coupled to the output terminal (8) for deriving a plurality of bias voltages and to the cascaded PNP transistors (Q2, Q3, Q8-Q11) to supply the bias voltages to the respective bases of the cascaded PNP transistors, so that the cascaded PNP transistors (Q2, Q3, Q8-Q11) are biased by bias voltages dependent on the voltage swing of the output signal.
REFERENCES:
patent: 3887878 (1975-06-01), Schade, Jr.
Huynh Luong Thien
Lehning Hienz
Coleman Sharon K.
Dover Rennie William
Motorola Inc.
Mullins James B.
Wolin Harry A.
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