Comparator integration time stabilization technique utilizing common mode mitigation scheme
AssigneeQUALCOMM Incorporated
InventorsTodd Morgan Rasmus, Shih-Wei Chou
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Abstract
Aspects of the present disclosure provide a method for regulating an integration current of a sensing amplifier. The sensing amplifier includes a first input transistor and a second input transistor, wherein a source of the first input transistor and a source of the second input transistor are coupled to a source node. The method includes pulling a current from or sourcing the current to the source node, measuring the integration current, comparing the measured integration current with a reference signal, and adjusting the current pulled from or sourced to the source node based on the comparison.
Claims23
An apparatus, comprising:
- an error amplifier having a first input, a second input, and an output;
- a sensing amplifier including a first transistor and a second transistor, wherein a source of the first transistor and a source of the second transistor are coupled to a common source node;
- a first current-control device coupled to the common source node, wherein the first current-control device has a control input coupled to the output of the error amplifier;
- a replica circuit coupled to the first input of the error amplifier, wherein the replica circuit includes a third transistor replicating one of the first transistor and the second transistor;
- a second current-control device coupled to a source of the third transistor, wherein the second current-control device has a control input coupled to the output of the error amplifier;
- a reference circuit coupled to the second input of the error amplifier, wherein the reference circuit is configured to output a reference signal;
- and
- a switch coupled between the first current-control device and the common source node, wherein a control input of the switch is coupled to a timing circuit.
An apparatus, comprising:
- an error amplifier having a first input, a second input, and an output;
- a sensing amplifier including a first transistor and a second transistor, wherein a source of the first transistor and a source of the second transistor are coupled to a common source node;
- a first current-control device coupled to the common source node, wherein the first current-control device has a control input coupled to the output of the error amplifier, wherein the first current-control device comprises a fourth transistor having a gate coupled to the output of the error amplifier, and wherein a drain of the fourth transistor is coupled to the common source node, and a source of the fourth transistor is coupled to a timing circuit;
- a replica circuit coupled to the first input of the error amplifier, wherein the replica circuit includes a third transistor replicating one of the first transistor and the second transistor;
- a second current-control device coupled to a source of the third transistor, wherein the second current-control device has a control input coupled to the output of the error amplifier;
- and
- a reference circuit coupled to the second input of the error amplifier, wherein the reference circuit is configured to output a reference signal.
Dependencies are inferred from the claim text.