Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1994-08-03
1995-05-30
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330311, H03F 345
Patent
active
054205409
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.
REFERENCES:
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
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 Rail-To-Rail Operational Amplifier", IEEE 1992 Bipolar Circuits and Technology Meeting, pp. 242-245.
Analog Devices Inc.
Mullins James B.
LandOfFree
Double-folded cascode operational amplifier does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Double-folded cascode operational amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Double-folded cascode operational amplifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-365122