US 12,348,202 B2 · Operational amplifier circuit and operational amplifier compensation circuit for amplifying input signal at high slew rate

Abstract

An operational amplifier compensation circuit includes; a first transistor activated/deactivated in response to a signal level difference between an input signal applied to an operational amplifier and an output signal provided by the operational amplifier, a first signal amplifying circuit including a second transistor and a first load, wherein the first signal amplifying circuit is configured to generate a first gate voltage amplified in response to the voltage level difference between the input signal and the output signal in relation to an internal resistance of the second transistor and a resistance of the first load when the first transistor is activated, and a third transistor configured to generate a first compensation current in response to the amplified first gate voltage and provide the first compensation current to the operational amplifier.

Claims18

Dependent claims

An operational amplifier compensation circuit, comprising:

a first transistor activated/deactivated in response to a level difference between an input signal applied to an operational amplifier and an output signal provided by the operational amplifier;
a first signal amplifying circuit including a second transistor and a first load, wherein the first signal amplifying circuit is configured to generate a first gate voltage based on the level difference between the input signal and the output signal when the first transistor is activated;
and
a third transistor configured to generate a first compensation current in response to the amplified first gate voltage, and provide the first compensation current to the operational amplifier,
wherein the first signal amplifying circuit further includes a fourth transistor connected to the second transistor, and
activation of the fourth transistor is based on a voltage level of a first amplification signal provided by the operational amplifier.

3 more elements

An operational amplifier circuit compensating a slew rate of an output signal provided by the operational amplifier circuit, wherein the operational amplifier circuit comprises:

an amplifying circuit configured to provide an amplification signal by amplifying a difference between an input signal applied to the operational amplifier circuit and the output signal;
an output circuit configured to generate the output signal in response to the amplification signal;
and
a compensation circuit configured to receive the amplification signal and provide a compensation current generated in response to the amplification signal to the output circuit, wherein the compensation circuit includes a source degeneration transistor configured to receive the amplification signal as a gate signal, and wherein activation/deactivation of the source degeneration transistor is determined in response to a voltage level of the amplification signal,
wherein the output circuit is further configured to generate the output signal in relation to the compensation current to reduce a signal level shift time.

2 more elements

An operational amplifier compensation circuit for assisting an amplification operation of an operational amplifier, the operational amplifier compensation circuit comprising:

a first input transistor configured to generate a first current on the basis of a signal level difference between an input signal and an output signal of the operational amplifier;
a first current mirror circuit connected to a source terminal or a drain terminal of the first input transistor to output a second current having the same level as a level of the first current;
a second current mirror circuit configured to receive the second current to generate a third current;
and
an additional compensation circuit including a first additional compensation transistor and a first load, the additional compensation circuit being configured to provide the second current mirror circuit with an additional compensation current generated based on an internal resistance of the first additional compensation transistor and a resistance of the first load when the first input transistor is activated, wherein
a compensation current obtained by summating the additional compensation current and the third current is provided to the operational amplifier.

3 more elements

Dependencies are inferred from the claim text.

Operational amplifier circuit and operational amplifier compensation circuit for amplifying input signal at high slew rate

Life of this patent

Operational amplifier circuit and operational amplifier compensation circuit for amplifying input signal at high slew rate

Life of this patent

Abstract

Claims18