Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1988-10-18
1989-11-14
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, H03F 345
Patent
active
048810452
ABSTRACT:
A Class-A complementary metal oxide semi-conductor (CMOS) operational amplifier is provided having an improved slew rate. The preferred embodiment of the invention utilizes a CMOS amplifier circuit and an external capacitor, which together exhibit relatively poor sourcing of current and hence a relatively low positive slew rate in response to an input signal being more positive than an output signal of the CMOS amplifier by a relatively large amount. The disparity between the input and output signals defines an error signal. The present invention also includes a supplemental output stage communicating with the amplifier circuitry and the external capacitor. The supplemental output stage is activated in order to supply additional sourcing current, thereby increasing the positive slew rate, when a relatively large error signal is present and is de-activated otherwise. The present invention can also provide an improved negative slew rate in a CMOS amplifier circuit and an external capacitor, which together exhibit poor sinking of current in response to the input signal being more negative than the output signal by a relatively large amount.
REFERENCES:
patent: 4240040 (1980-12-01), Saarl
patent: 4636743 (1987-01-01), Cotrean
patent: 4739281 (1988-04-01), Doyle
Cochran William W.
Hewlett--Packard Company
Mullins James B.
LandOfFree
Transistor amplifier for high slew rates and capacitive loads does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Transistor amplifier for high slew rates and capacitive loads, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transistor amplifier for high slew rates and capacitive loads will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1854733