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US 6,208,125 B1Granted
Low noise current source
AssigneeLergity, Inc.
InventorDaren Allee
Life of this patent
Estimating the term…
Abstract
A low noise current source is provided. A resistor and a transistor are serially coupled with the resistor and adapted to be coupled between a first terminal of a voltage supply and an output terminal. The transistor is capable of delivering a preselected voltage signal to the output terminal having a magnitude responsive to a first control signal relatively independent of the magnitude of the voltage on the first terminal of the voltage supply.
Claims11
A low noise current source, comprising:
- a resistor;
- and
- a P-type transistor having a first terminal coupled to an output terminal and a second terminal coupled through said resistor to a first terminal of a voltage supply, said transistor delivering a substantially constant current signal to said output terminal having a magnitude responsive to a first control signal, said substantially constant current signal having a magnitude relatively independent of the magnitude of the voltage on said first terminal of said voltage supply.
A low noise current source, comprising:
- a resistor;
- and
- a P-intrinsic transistor having a first terminal coupled to an output terminal and a second terminal coupled through said resistor to a first terminal of a voltage supply, said transistor delivering a substantially constant current signal to said output terminal having a magnitude responsive to a first control signal, said substantially constant current signal having a magnitude relatively independent of a magnitude of a voltage on said first terminal of said voltage supply.
A low noise current source, comprising:
- a resistor;
- and
- a P-type transistor adapted to provide a substantially constant current, the P-type transistor having a first terminal coupled to an output terminal and a second terminal coupled through said resistor to a first terminal of a voltage supply, said transistor having a gate coupled to receive a control signal wherein variations in the magnitude of the voltage supply produce similar variations in the magnitude of the control signal.
Dependencies are inferred from the claim text.