Feedback amplifier compensation circuitry

Details Feedback amplifier compensation circuitry Feedback amplifier compensation circuitry

1986-09-19

1988-09-27

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including signal feedback means

330151, H03F 134

Patent

active

047744782

ABSTRACT:
A frequency-compensated transistor feedback amplifier provides relatively wide bandwidth and relatively large phase and gain margins, irrespective of the transconductance of the transistors in the amplifier. Each one of three preferred embodiments (10, 50, 104) of the invention includes a transconductance stage (20, 68, 68) and an amplifier stage (12 and 14, 54, 54 and 14). The transconductance stage delivers an input signal to the amplifier stage, which produces an amplified replica of the input signal. A feedback capacitor (24, 88, 24 and 88) connected between the output and the input of the amplifier stage provides dominant pole compensation by which the magnitude of the loop gain diminishes by 6 dB/octave with increasing frequency. The capacitor provides a forward feedthrough path for any residual portion of the input signal so that the residual portion arrives at the output of the amplifier stage in substantially the same phase relation with that of the output signal of intermediate frequency. This invention can be implemented in circuitry whose input signal is taken from a transconductance stage that comprises an amplifier configured in either a single-ended output mode or a double-ended output mode.

REFERENCES:
patent: 4484148 (1984-11-01), Wieser et al.

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