Substrate bias circuit and method for biasing a substrate
AssigneeNXP USA, Inc.
InventorsChris C. Dao, Stefano Pietri, Juxiang Ren, Robert S. Ruth
Life of this patent
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Abstract
A substrate bias circuit and method for biasing a substrate are provided. A substrate bias circuit includes a first voltage source, a second voltage source, a diode coupled between the first voltage source and the second voltage source, and a plurality of transistors, each transistor in the plurality of transistors having a substrate terminal. In one example, the first voltage source supplies, via the diode, the substrate terminal of a first transistor of the plurality of transistors during a power-up, and the second voltage source supplies the substrate terminal of the first transistor after the power-up.
Claims19
A substrate bias circuit comprising:
- a first voltage source;
- a plurality of transistors, each transistor in the plurality of transistors having a substrate terminal;
- a second voltage source coupled to the substrate terminal of a first transistor in the plurality of transistors, the second voltage source comprising a voltage regulator;
- and
- a first diode having an anode terminal connection to the first voltage source and a cathode terminal connection to the second voltage source.
A substrate bias circuit comprising:
- a first voltage source;
- a plurality of transistors;
- a second voltage source coupled to a substrate terminal of a first transistor in the plurality of transistors, the second voltage source comprising a voltage regulator;
- a first diode having an anode terminal connection to the first voltage source and a cathode terminal connection to the second voltage source;
- a third voltage source;
- a fourth voltage source coupled to a substrate terminal of a second transistor in the plurality of transistors;
- and
- a second diode coupled between the third voltage source and the fourth voltage source.
A method for biasing a substrate, the method comprising:
- coupling, via a first diode, a first voltage source to a substrate terminal of a first transistor, the first diode having an anode terminal connection to the first voltage source and a cathode terminal connection to a second voltage source, the second voltage source comprising a voltage regulator;
- and
- coupling the second voltage source to the substrate terminal of the first transistor;
- wherein the first voltage source supplies the substrate terminal of the first transistor during power-up, and the second voltage source supplies the substrate terminal of the first transistor after power-up.
Dependencies are inferred from the claim text.