Circuit having an amplifier stage and a current mirror loop or stability network

A circuit, comprising:

• an amplifier stage comprising a first positive amplifier branch, a second positive amplifier branch, a first negative amplifier branch, and a second negative amplifier branch, the amplifier stage having current flow paths therethrough cascaded in a first flow line for a first core current for the amplifier stage between a supply node and a ground node, wherein the first positive amplifier branch and the first negative amplifier branch have respective input nodes configured to receive an input signal applied therebetween, and wherein the second positive amplifier branch and the second negative amplifier branch have current flow paths therethrough cascaded in a second flow line for a second core current between the supply node and the ground node;
• and
• a stability network having a gain bandwidth range, the stability network having a first input coupled to an output signal of the amplifier stage and a second input coupled to receive an output voltage setting signal, wherein the amplifier stage is configured to short-circuit the output signal from the amplifier stage within the gain bandwidth range based on the output voltage setting signal.

A method of operating an amplifier circuit that includes an amplifier stage and a current mirror loop, wherein the amplifier stage comprises a first positive amplifier branch, a second positive amplifier branch, a first negative amplifier branch, and a second negative amplifier branch, the first positive amplifier branch and the first negative amplifier branch having current flow paths therethrough cascaded in a first flow line for a first core current for the amplifier stage, the first flow line extending between a supply node and ground node, wherein the second positive amplifier branch and the second negative amplifier branch have current flow paths therethrough cascaded in a second flow line for a second core current between the supply node and the ground node, wherein the first positive amplifier branch and the first negative amplifier branch have respective input nodes configured to receive an input signal applied therebetween, and wherein the current mirror loop is coupled to the respective input nodes of the first positive amplifier branch, the second positive amplifier branch, the first negative amplifier branch, and the second negative amplifier branch, the method comprising:

• operating the current mirror loop to provide an adjustable high-impedance bias source for the first core current for the amplifier stage.

A method of operating an amplifier circuit that includes an amplifier stage and a stability network having a gain bandwidth range, wherein the amplifier stage comprises a first positive amplifier branch, a second positive amplifier branch, a first negative amplifier branch, and a second negative amplifier branch, the first positive amplifier branch and the second negative amplifier branch having current flow paths therethrough cascaded in a first flow line for a first core current for the amplifier stage, the flow line extending between a supply node and a ground node, wherein the second positive amplifier branch and the second negative amplifier branch have current flow paths therethrough cascaded in a second flow line for a second core current between the supply node and the ground node, wherein the first positive amplifier branch and the first negative amplifier branch have respective input nodes configured to receive an input signal applied therebetween, and wherein the stability network to an output of the amplifier stage, the method comprising:

• receiving an output voltage setting signal by the stability network;
• and
• based on the output voltage setting signal, controlling the amplifier stage to short-circuit an output signal from the amplifier stage within the gain bandwidth range.