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US 7,598,794 B1Granted
Well bias architecture for integrated circuit device
AssigneeCypress Semiconductor Corporation
InventorsGalen E. Stansell, King Eric Kwan, Xiaolin Ouyang
Life of this patent
Estimating the term…
Abstract
Disclosed is a high voltage switch circuit that can include a first well bias switch configured to track the greater of an input voltage and a supply voltage, a voltage comparator configurable to compare the input voltage to a predetermined reference voltage, and a second well bias switch having a control input coupled to an output of the comparator.
Claims20
A high voltage switch circuit, comprising:
- a first well switch circuit configured to provide a first switch output to a first well that tracks a greater of an input voltage and a first supply voltage;
- a voltage comparator configurable to compare the input voltage to a predetermined reference level and generate a comparator output;
- and
- a second well switch circuit configured to provide the input voltage to a second well in response to the comparator output having a first value.
1 more element
A well supply switch architecture, comprising:
- a first section having a first plurality of transistors formed in at least a first well;
- a second section having a second plurality of transistors formed in at least a second well;
- and
- a switch section having a first switch circuit that couples the first well to an input voltage or to a first supply voltage based on a difference between the input voltage and first supply voltage, and a second switch circuit that couples the second well to the input voltage or to a second supply voltage based on a difference between the input voltage and a reference voltage.
1 more element
A method of providing well biasing voltages to different wells of an integrated circuit, comprising the steps of:
- if an input voltage is no greater than a first supply voltage and a reference level, coupling a first well to the first supply voltage and a second well to a second supply voltage;
- if the input voltage is greater than a first supply voltage and no greater than the reference level, coupling the first well to the input voltage and the second well to the second supply voltage;
- and
- if the input voltage is greater than the first supply voltage and the reference level, coupling the first well and second well to the input voltage.
1 more element
Dependencies are inferred from the claim text.