Voltage generating circuits based on a power-on control signal
AssigneeTaiwan Semiconductor Manufacturing Company, Ltd.
InventorWen-Han Wang
Life of this patent
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Abstract
A circuit includes a power-on control circuit and a voltage generating circuit. The power-on control circuit is configured to cause a power-on control signal to follow a voltage level of a first supply voltage during a first time period that a voltage level of a second supply voltage is less than a threshold value, and to set the power-on control signal to have a voltage level of a reference voltage during a second time period that the voltage level of the second supply voltage is greater than the threshold value. The voltage generating circuit is configured to generate a voltage signal responsive to the power-on control signal.
Claims20
A circuit, comprising:
- a first supply voltage node configured to carry a first supply voltage;
- a second supply voltage node configured to carry a second supply voltage;
- a reference node configured to carry a reference voltage;
- and
- a power-on control circuit comprising a buffer having an input node and a power node, the input node being coupled with the second supply voltage node, the power node being coupled with the first supply voltage node, and the power-on control circuit being configured to:
- cause a power-on control signal to follow a voltage level of the first supply voltage during a first time period that a voltage level of the second supply voltage is less than a threshold value;
- and
- set the power-on control signal to have a voltage level of the reference voltage during a second time period that the voltage level of the second supply voltage is greater than the threshold value;
- and
- a voltage generating circuit configured to generate a voltage signal responsive to the power-on control signal, the voltage signal having a voltage level between the voltage level of the first supply voltage and the voltage level of the reference voltage during the second time period.
A method, comprising:
- causing a power-on control signal to follow a voltage level of a first supply voltage during a first time period that a voltage level of a second supply voltage is less than a threshold value, the power-on control circuit comprising a buffer having an input node and a power node, the input node being coupled with the second supply voltage node, and the power node being coupled with the first supply voltage node;
- setting the power-on control signal to have a voltage level of a reference voltage during a second time period that the voltage level of the second supply voltage is greater than the threshold value;
- and
- generating a voltage signal responsive to the power-on control signal, the voltage signal having a voltage level between the voltage level of the first supply voltage and the voltage level of the reference voltage during the second time period.
A circuit, comprising:
- a first supply voltage node configured to carry a first supply voltage;
- a second supply voltage node configured to carry a second supply voltage;
- a reference node configured to carry a reference voltage;
- a power-on control circuit comprising:
- a buffer having an input node, an output node, and a power node, the input node being coupled with the second supply voltage node, the power node being coupled with the first supply voltage node;
- and
- a sub-circuit coupled with the output node of the buffer, the sub-circuit being configured to generate the power-on control signal based on a signal on the output node of the buffer, and the signal on the output node of the buffer and the power-on control signal corresponding to a transfer function with hysteresis;
- and
- a voltage generating circuit configured to, in response to the power-on control signal, generate a voltage signal having a voltage level between the voltage level of the first supply voltage and the voltage level of the reference voltage during the second time period.
Dependencies are inferred from the claim text.