Transistor amplifier for high slew rates and capacitive loads

Details Transistor amplifier for high slew rates and capacitive loads Transistor amplifier for high slew rates and capacitive loads

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

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