Capacitance multiplier for the internal frequency compensation o

Details Capacitance multiplier for the internal frequency compensation o Capacitance multiplier for the internal frequency compensation o

1993-02-04

1995-01-17

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330293, 330302, H03F 345

Patent

active

053829182

ABSTRACT:
A monolithic switching regulator on chip loop frequency compensation circuit is described. An op-amp is provided with a conventional small frequency compensation capacitor, which determines its unity gain frequency and an input resistor. The op-amp incorporates 100% negative feedback. When driven at a frequency that is below its unity gain frequency the noninverting input of the op-amp displays a capacitance having a value on the order of nanofarads, which value would ordinarily require an excessive chip area if fabricated as an actual capacitor. This capacitance value is useful in the on chip loop frequency compensation of a switching regulator where the switching frequency is operated at about 150 kHZ.

REFERENCES:
patent: 3831117 (1974-08-01), Fletcher et al.
patent: 4607243 (1986-08-01), Dreier
patent: 5129884 (1993-03-01), Kusano
Murray, Bipolar op amp with f.e.t. character, Jun. 10, 1980 issue of New Electron.
Sedra and Smith, The 741 Op-Amp Circuit in the second edition of Microelectronic Circuits, 1987 Holt, Rinehart, and Winston Inc. New York pp. 744-747.
Sing, B. P. `A Novel Circuit for Supercapacitor Simulation`, International Journal of Electronics, vol. 52, No. 4, Apr. 1982, London GB, pp. 337-339.

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