Transistor bias current regulation apparatus, method, and system
AssigneeIntel Corporation
InventorStewart Taylor
Life of this patent
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Abstract
A biased transistor circuit utilizes a transistor that exhibits a change in threshold voltage as the drain-to-source voltage changes due to power supply voltage changes. A bias circuit senses the power supply voltage changes and modifies a gate bias voltage on the transistor to maintain a substantially constant drain bias current in the transistor.
Claims22
A circuit comprising:
- a first transistor having a drain node coupled to a power supply node, and a gate node coupled to receive a bias voltage;
- and
- a bias network to modify the bias voltage as a voltage on the power supply node changes to maintain a substantially constant drain current in the first transistor.
An amplifier circuit comprising:
- an output transistor subject to varying drain current with varying drain-to-source voltage;
- and
- a bias circuit to dynamically modify a gate-to-source bias voltage on the output transistor to reduce drain current variations when the drain-to-source voltage changes on the output transistor.
The amplifier circuit of claim 111 wherein the bias circuit comprises a sensing transistor having a substantially constant drain current, the sensing transistor having a drain node coupled to a power supply node to sense power supply voltage changes.
A method of regulating a bias current in a transistor comprising:
- sensing a power supply voltage;
- and
- modifying a gate bias voltage on the transistor to reduce drain current variations as the power supply voltage changes.
A system comprising:
- an omni-directional antenna;
- and
- an amplifier circuit coupled to drive a signal on the antenna, the amplifier having an output transistor subject to varying drain current with varying drain-to-source voltage, and a bias circuit to dynamically modify a gate-to-source bias voltage on the output transistor to reduce drain current variations when the drain-to-source voltage changes on the output transistor.
Dependencies are inferred from the claim text.