Pass gate circuit
AssigneeSTMicroelectronics R&D (Shanghai) Co. Ltd.
InventorsFei Wang, KunKun Zheng
Life of this patent
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Abstract
A pass gate circuit includes a first transistor coupled between an input node (receiving an input signal) and an output node (outputting an output signal). A second transistor is configured to generate a voltage difference in response to a bias current flowing therethrough, wherein that voltage difference is applied between a first gate of the first transistor and the output node. A differential amplifier functions to compare the voltage at the output node to a reference voltage and generate the bias current in response to that comparison.
Claims19
A pass gate circuit, comprising:
- a first transistor coupled between an input node configured to receive an input signal and an output node configured to output an output signal;
- a second transistor configured to generate a voltage difference for application between a first gate of the first transistor and the output node in response to a bias current flowing through said second transistor;
- and
- an amplifier configured to compare the output signal with a reference voltage and supply the bias current to the second transistor in response to said comparison.
A circuit, comprising:
- a first transistor having a source-drain path coupled between an input node and an output node, said first transistor having a first gate;
- a second transistor having a source-drain path coupled between a biasing node and a reference supply node, said second transistor having a second gate coupled to the output node;
- wherein said first gate is coupled to the biasing node;
- and
- a differential amplifier configured to compare a voltage at the output node to a reference voltage and generate a biasing current at said biasing node which is proportional to a difference between the voltage at the output node and the reference voltage.
A method, comprising:
- passing an input signal from an input node to an output node through a first transistor;
- sensing a difference between a voltage at the output node and a reference voltage;
- generating a biasing current in response to said sensed difference;
- using the biasing current to generate a voltage difference;
- and
- applying said voltage difference between a control terminal of the first transistor and said output node;
- wherein the step of using the biasing current comprises passing said biasing current through a source-drain path of a second transistor and applying the voltage at the output node to a control terminal of said second transistor.
Dependencies are inferred from the claim text.