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US 8,476,974 B2Granted
Differential amplifier and method for the operation of a differential amplifier
AssigneeAms AG
InventorsThomas Carl Froehlich, Wolfgang Duenser
Life of this patent
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Abstract
A differential amplifier comprises a first amplifier (A1) with a signal input (Inp) and a signal output (Out1) that is fed back to a first feedback input (In1) of the first amplifier (A1) and is also connected to a first output (outp) of the differential amplifier. Furthermore, a buffer circuit (Buff) is connected to the first output (outp). A nonlinear resistor circuit (Rnl1, Rnl2) is coupled via a first output node (Vmid1) with the first output (outp) and via a second output node (Vmid2) with the buffer circuit (Buff).
Claims10
A differential amplifier comprising:
- a first amplifier with a signal input and a signal output that is fed back to a first feedback input of the first amplifier and is connected to a first output of the differential amplifier;
- a buffer circuit that is connected to the first output;
- and
- a nonlinear resistor circuit that is coupled via a first output node to the first output and via a second output node to the buffer circuit,
- wherein the nonlinear resistor circuit comprises a first component that comprises a first resistor and a first transistor that are connected to each other in parallel and are coupled, on one hand, to the first output node and, on the other hand, via a second resistor to the second output node and a bias current can be fed to the control side of the first transistor for controlling the component.
2 more elements
Dependencies are inferred from the claim text.