Automatic substrate biasing circuit
First Claim
1. An automatic substrate biasing circuit for use in integrated circuit devices to bias a substrate voltage to a desired level, comprising:
- a comparator, which compares a plurality of voltage sources to generate a comparison signal;
a shift control circuit, which generates a plurality of control signals corresponding to the voltage sources according to the comparison signal; and
a switching circuit, which selectively determines one of the voltage sources as the substrate voltage according to the control signals;
wherein the substrate voltage is coupled to the shift control circuit to supply power to the shift control circuit.
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Abstract
An automatic substrate biasing circuit, which detects the voltage source having the largest magnitude of voltage in the circuit, to bias the substrate voltage of the circuit to a desired level automatically based on the comparison result. A comparator is used in the present invention to compare different voltage sources to obtain a comparison result, which is subsequently received by a control circuit to selectively choose one of the voltage sources to control the switching operation of the switch, so that the largest voltage of the circuit can be obtained. This voltage is then used to bias the substrate voltage to a desired level.
5 Citations
7 Claims
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1. An automatic substrate biasing circuit for use in integrated circuit devices to bias a substrate voltage to a desired level, comprising:
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a comparator, which compares a plurality of voltage sources to generate a comparison signal;
a shift control circuit, which generates a plurality of control signals corresponding to the voltage sources according to the comparison signal; and
a switching circuit, which selectively determines one of the voltage sources as the substrate voltage according to the control signals;
wherein the substrate voltage is coupled to the shift control circuit to supply power to the shift control circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification