Amplifier input circuit

Details Amplifier input circuit Amplifier input circuit

1987-07-20

1988-10-25

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330255, H03F 330

Patent

active

047806893

ABSTRACT:
An improved amplifier input circuit for use as the input stage for a current feedback amplifier to reduce offset and limit overload currents. The circuit includes first and second bias current supplies, first and second diodes having anode and cathode terminals, a PNP transistor and a NPN transistor, first and second input terminals, and first and second current sense terminals. Currents flowing through the sense terminals are sensitive to an input current in the first input terminal. Bias currents from the first and second bias current supplies are divided, respectively, between the PNP transistor and first diode, and the NPN transistor and second diode. The base terminals of the transistors are connected in common to the second input terminal. Other embodiments are also described.

REFERENCES:
patent: 4502020 (1985-02-01), Nelson et al.
patent: 4628279 (1986-12-01), Nelson
patent: 4630685 (1987-01-01), Saller et al.
Blauschild, "An 8b 50ns Monolithic A/D Converter with internal S/H," 1983 IEEE International Solid-State-Circuits Conference, Feb. 24, 1983, pp. 178-179.
"A New Approach to Op Amp Design" Application Note 300-1, Comlinear Corporatioln, Mar. 1985.

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