Amplifiers with effectively zero input capacitance

Details Amplifiers with effectively zero input capacitance Amplifiers with effectively zero input capacitance

1989-06-14

1991-01-29

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

73724, 324663, 330297, 331 65, H03F 304, G01L 912

Patent

active

049889532

ABSTRACT:
An amplifier includes a first integrated circuit differential amplifier, the output of the first differential amplifier being fed back to its inverting input, an input is applied to its non-inverting input and second and third differential amplifiers are provided in the positive and negative supply line by which the input signal to the first differential amplifier may be imposed on the positive and negative supplies, so that the input capacitance of the first differential amplifier is effectively zero.

REFERENCES:
Del Curso et al., "Simple Circuit to Double the Output-Voltage Swing of an Operational Amplifier with Increased Slew Rate", Electronics Letters, Mar. 23, 1972, vol. 8, No. 6, pp. 151, 152.
Thomas, "Input Capacitance Feedback Improves Neutralization", Electronics, Jan. 20, 1977, pp. 112, 113.
"Electronics" by Dale R. Younge, dated: Oct. 28, 1968, pp. 90 & 91.

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