Amplifier having improved gain-bandwidth product

Details Amplifier having improved gain-bandwidth product Amplifier having improved gain-bandwidth product

1986-06-30

1987-12-01

LaRoche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, H03F 345

Patent

active

047107286

ABSTRACT:
An amplifier includes an input stage having first and second differentially coupled transistors for receiving a differential input signal and providing a differential output to third and fourth differentially coupled transistors in the second stage. An RC circuit cooperates with the first and second stages to produce first and second additional pole-zero pairs, one occurring before the unity gain frequency and one occurring after the unity gain frequency. A second RC circuit cooperates with the second stage and introduces a third additional pole-zero pair which occurs below the unity gain frequency. As a result, the gain bandwidth product and the phase margin proximate the unity gain frequency are enhanced.

REFERENCES:
patent: 4555670 (1985-11-01), Tanaka
patent: 4607232 (1986-08-01), Gill, Jr.

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