Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1993-06-29
1994-06-21
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330261, 330311, H03F 345
Patent
active
053231210
ABSTRACT:
The gain of a folded cascode operational amplifier is enhanced by connecting the current circuits of added compensation transistors to supply the current circuits of pre-existing gain transistors. Changes in the current through the primary gain transistor resulting from a change in the output load produce approximately equal changes in the base currents of both the primary gain and primary compensation transistors. The change in the compensation transistor's base current is transmitted through the amplifier circuitry to supply the change in the gain transistor's base current, rather than forcing a change in the input voltage differential to supply this current. The differential input signal is thus less sensitive to changes in the output, resulting in higher transconductance and gain. Providing a similar compensation loop for a second gain transistor through the second compensation transistor produces a circuit balance that lowers both the circuit's offset voltage, and the temperature dependence of the offset voltage.
REFERENCES:
patent: 4687984 (1987-08-01), Butler
patent: 5140280 (1992-08-01), Vyne et al.
Analog Devices Inc.
Mullins James B.
LandOfFree
Folded cascode operational amplifier with gain enhancing base cu does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Folded cascode operational amplifier with gain enhancing base cu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Folded cascode operational amplifier with gain enhancing base cu will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2223211