Balanced double-folded cascode operational amplifier

Details Balanced double-folded cascode operational amplifier Balanced double-folded cascode operational amplifier

1995-05-12

1996-06-04

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, 330311, H03F 345

Patent

active

055237185

ABSTRACT:
A double-folded cascode operational amplifier capable of operating with rail-to-rail common mode inputs includes two differential input transistor pairs of opposite conductivity, with an associated current source and input resistor pair for each pair of input transistors. Its gain stage includes two interconnected pairs of folded cascode gain transistors that are connected to the two pairs of input resistors so that a change in the differential input signal produces a corresponding change in the gain stage output via the resistors. An output stage includes transistor-resistor circuitry to bias a pair of output transistors in opposite directions and produce a net amplifier output at their junction. The gain transistor voltages are balanced by a voltage shifting circuit to inhibit input voltage offsets.

REFERENCES:
patent: 4406990 (1983-09-01), Noro
patent: 4463319 (1984-07-01), Kearney
patent: 4687984 (1987-08-01), Butler
patent: 4918398 (1990-04-01), Huijsing et al.
patent: 5140280 (1992-08-01), Vyne et al.
patent: 5293136 (1994-03-01), Ryat
patent: 5294892 (1994-03-01), Ryat
patent: 5294893 (1994-03-01), Ryat
Goodenough,"Circuit Lets IC OP AMP Handle .+-.0.9-V Rail-To-Rail Signals:", Electronic Design, Oct. 1, 1992, p. 31.
Vyne et al., "A Quad Low Voltage Ril-To-Rail Operational Amplifier", IEEE 1992 Bipolar Circuits and Technology Meeting, pp. 242-245. (No month).

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