Comparator low power response
AssigneeTexas Instruments Incorporated
InventorsNitin Agarwal, Venkat Ramakrishna Saripalli, Venkata Ramanan R
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Abstract
In described examples, an amplifier can be arranged to generate a first stage output signal in response to an input signal. The input signal can be coupled to control a first current coupled from a first current source through a common node to generate the first stage output signal. A replica circuit can be arranged to generate a replica load signal in response to the input signal and in response to current received from the common node. A current switch can be arranged to selectively couple a second current from a second current source to the common node in response to the replica load signal.
Claims20
A circuit comprising:
- a differential input;
- an amplifier stage coupled to a common node and to the differential input;
- a first set of input transistors coupled between the common node, a replica node, and the differential input;
- a bias generator coupled to the replica node and a bias node, and coupled to receive a first bias signal and a second bias signal;
- and
- a current switch coupled to the common node and the bias node.
A circuit comprising:
- a replica input transistor pair coupled to a common node, the replica input transistor pair configured to:
- detect a voltage drop on the common node;
- and
- provide a replica signal based on the voltage drop on the common node;
- a bias generator coupled to the replica input transistor pair and configured to receive a first bias control signal and a second bias control signal and provide a bias signal based on the replica signal;
- and
- a current switch coupled to the bias generator via a bias node and to the common node and configured to provide current to the common node based on the bias signal.
A method comprising:
- detecting, by a replica input transistor pair, a voltage drop on a common node, the replica input transistor pair coupled to the common node and a differential input;
- providing, by the replica input transistor pair, a replica signal based on the voltage drop on the common node;
- providing, by a bias generator, a bias signal to a bias node based on the replica signal, the bias generator coupled to the replica input transistor pair and coupled to receive a first bias control signal and a second bias control signal;
- and
- providing, by a current switch, current to the common node based on the bias signal, the current switch coupled to the bias generator via the bias node and to the common node.
Dependencies are inferred from the claim text.