Single supply digital voltage level shifter
First Claim
1. A single supply digital voltage level shifter comprising:
- a first inverter having a first input for receiving an input signal of a first voltage swing, and a first output for outputting a first output signal;
a second inverter having a second input for receiving the first output signal, and a second output for outputting a second output signal of a second voltage swing, the second output signal being a level-shifted version of the input signal;
a comparison stage having a first comparison stage input for receiving the input signal, a second comparison stage input for receiving the second output signal, and a comparison stage output for outputting a comparison stage output control signal; and
a control stage connected in a circuit branch of the first inverter, the control stage having a control stage switch that assumes a non-conducting state dependent on a logical state of the comparison stage output control signal.
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Accused Products
Abstract
A single-supply digital voltage level shifter has a first inverter having a first input for receiving an input signal with a first voltage swing, and a first output for outputting a first output signal. A second inverter has a second input for receiving the first output signal, and a second output for outputting a second output signal with a second voltage swing, where the second output signal is a level-shifted version of the input signal. A comparison stage includes a first comparison stage input for receiving the input signal, a second comparison stage input for receiving the second output signal, and a comparison stage output for outputting a comparison stage output control signal. A control stage is connected in a circuit branch of the first inverter and has a control stage switch that assumes a non-conducting state dependent on a logical state of the comparison stage output control signal.
28 Citations
20 Claims
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1. A single supply digital voltage level shifter comprising:
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a first inverter having a first input for receiving an input signal of a first voltage swing, and a first output for outputting a first output signal; a second inverter having a second input for receiving the first output signal, and a second output for outputting a second output signal of a second voltage swing, the second output signal being a level-shifted version of the input signal; a comparison stage having a first comparison stage input for receiving the input signal, a second comparison stage input for receiving the second output signal, and a comparison stage output for outputting a comparison stage output control signal; and a control stage connected in a circuit branch of the first inverter, the control stage having a control stage switch that assumes a non-conducting state dependent on a logical state of the comparison stage output control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of operating a single supply digital voltage level shifter, the method comprising:
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providing a first inverter having a first input for receiving an input signal of a first voltage swing, and a first output for outputting a first output signal; providing a second inverter having a second input for receiving first output signal, and a second output for outputting a second output signal of a second voltage swing, the second output signal being a level-shifted version of the input signal; providing a comparison stage having a first comparison stage input for receiving the input signal, a second comparison stage input for receiving the second output signal, and a comparison stage output for outputting a comparison stage output control signal; providing a control stage connected to a circuit branch of the first inverter, the control stage having a control stage switch; applying the input signal to the first input; and controlling the control stage switch to assume a non-conducting state dependent on a logical state of the comparison stage output control signal. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification