Level shifter circuit, corresponding device and method
First Claim
1. A circuit, including:
- a first circuit comprising a first logic circuit receiving a switching input signal and being powered between a first supply voltage and a first reference voltage, the first circuit also including at least one first switching element configured for receiving output from the first logic circuit and being powered between a second supply voltage and the first reference voltage,a second circuit powered between the second supply voltage and a second reference voltage, the first supply voltage being different than the second supply voltage, the first reference voltage being different than the second reference voltage, wherein the second circuit includes;
i) at least one second switching element having a source coupled to a drain of the at least one first switching element in the first circuit, wherein switching of the at least one second switching element is controlled by switching of the at least one first switching element in the first circuit, andii) a latch circuit block driven by the at least one second switching element and having at least one latch output, wherein switching of the at least one latch output is controlled by switching of the at least one second switching element in the second circuit to provide at least one latch output level-shifted replica of the switching input signal applied to the at least one first switching element in the first circuit, anda feedback network between the at least one latch output and the at least one first switching element in the first circuit, the feedback network configured for sensing uncontrolled switching events of the at least one latch output occurring in the absence of switching of at least one first switching element in the first circuit and for applying to the at least one first switching element in the first circuit a forced switching signal to cancel out the uncontrolled switching events at the at least one latch output.
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Accused Products
Abstract
A level-shifter circuit operates to shift an input signal referenced to a first set supply voltages to generate an output signal referenced to a second set of supply voltages. The output signal from the level-shifter circuit is latched by a latching circuit. A logic gate has a first input configured to receive the input signal, a second input configured to receive a feedback signal and an output coupled to a input of the level shifting circuit. A feedback circuit has a first input configured to receive the output signal, a second input configured to receive the input signal and an output configured to generate the feedback signal. The feedback circuit operates to sense an uncontrolled switching event of the output signal occurring in the absence of a switching of the input signal and apply, in response thereto, the feedback signal to cancel the uncontrolled switching event.
10 Citations
20 Claims
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1. A circuit, including:
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a first circuit comprising a first logic circuit receiving a switching input signal and being powered between a first supply voltage and a first reference voltage, the first circuit also including at least one first switching element configured for receiving output from the first logic circuit and being powered between a second supply voltage and the first reference voltage, a second circuit powered between the second supply voltage and a second reference voltage, the first supply voltage being different than the second supply voltage, the first reference voltage being different than the second reference voltage, wherein the second circuit includes; i) at least one second switching element having a source coupled to a drain of the at least one first switching element in the first circuit, wherein switching of the at least one second switching element is controlled by switching of the at least one first switching element in the first circuit, and ii) a latch circuit block driven by the at least one second switching element and having at least one latch output, wherein switching of the at least one latch output is controlled by switching of the at least one second switching element in the second circuit to provide at least one latch output level-shifted replica of the switching input signal applied to the at least one first switching element in the first circuit, and a feedback network between the at least one latch output and the at least one first switching element in the first circuit, the feedback network configured for sensing uncontrolled switching events of the at least one latch output occurring in the absence of switching of at least one first switching element in the first circuit and for applying to the at least one first switching element in the first circuit a forced switching signal to cancel out the uncontrolled switching events at the at least one latch output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A circuit, comprising:
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a level shifting circuit configured to shift an input signal referenced to a first set of a supply node and a ground to generate an output signal referenced to a second set of a supply node and a ground and latched by a latching circuit; a logic gate having a first input configured to receive the input signal, a second input configured to receive a feedback signal and an output coupled to a input of the level shifting circuit; a feedback circuit having a first input configured to receive the output signal, a second input configured to receive the input signal and an output configured to generate the feedback signal, wherein the feedback circuit operates to sense an uncontrolled switching event of the output signal occurring in the absence of a switching of the input signal and apply, in response thereto, the feedback signal to cancel the uncontrolled switching event; wherein the feedback circuit comprises; a first transistor and a second transistor having current paths coupled in series, wherein a control terminal of the first transistor is configured to receive the output signal and wherein a control terminal of the second transistor is configured to receive the input signal; and a current sensor configured to sense current flow through the current paths of first transistor and the second transistor and generate said feedback signal in response to the sensed current flow. - View Dependent Claims (12, 13, 14)
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15. A circuit, including:
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a first circuit comprising a first logic circuit receiving a switching input signal and being powered between a first supply voltage and a first reference voltage, the first circuit also including at least one first switching element configured for receiving output from the first logic circuit and being powered between a second supply voltage and the first reference voltage, a second circuit powered between the second supply voltage and a second reference voltage, the first supply voltage being different than the second supply voltage, the first reference voltage being different than the second reference voltage, wherein the second circuit includes; i) at least one second switching element having a source coupled to a drain of the at least one first switching element in the first circuit, and ii) a latch circuit block driven by the at least one second switching element and having at least one latch output, and a feedback network between the at least one latch output and the at least one first switching element in the first circuit, the feedback network configured for applying to the at least one first switching element in the first circuit a forced switching signal to cancel out uncontrolled switching events at the at least one latch output. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification