Operational amplifier

Details Operational amplifier Operational amplifier

1996-04-30

1998-04-28

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including signal feedback means

330100, 330107, H03F 134

Patent

active

057450102

ABSTRACT:
An operational amplifier including reverse amplifiers interconnected in series in an odd number of stages not less than three, an element for feeding back an output from the reverse amplifier in the last stage to an input of the reverse amplifier in a first stage, and a feedback capacitance element provided across the input and output ends of at least one of the reverse amplifiers. The Miller effect makes the feedback current from the capacitance element appear as if it were increased by a factor of the amplification factor of a concerned inverter. Thus, the capacity of the capacitance element preventing the oscillation of the inverters can be reduced. As a result, the operational amplifier becomes highly responsive, and therefore, becomes operable for a high frequency signal.

REFERENCES:
patent: 4763081 (1988-08-01), Jason
patent: 5287068 (1994-02-01), Olmstead et al.
R.G.H. Eschauzier et al., IEEE International Solid-State Circuits Conference, "A Programmable 1.5v CMOS class-AB Operational Amplifier with Hybrid Nested Miller Compensation for 120dB Gain and 6MHz UGF", Feb. 1994, vol. 37, pp. 246, 247, 346.

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