Dual supply voltages converter and method
AssigneeFrontend Analog and Digital Technology Corporation
InventorMing-Hsiang Chiou
Life of this patent
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Abstract
A dual supply voltages converter divides a supply voltage by a constant to produce a feature voltage larger than one when the supply voltage is a first voltage and smaller than 1 when the supply voltage is a second voltage and squares the feature voltage for comparing with itself. After squared, a value larger than one will larger than itself and a value small than 1 will smaller than itself. As a result, the supply voltage is determined to be the first or second voltage and thereby to be converted to the desired output voltage.
Claims13
A dual supply voltages converter comprising:
- an input for being connected with a supply voltage at a first voltage or a second voltage smaller than the first voltage;
- a control signal generator connected to the input for generating a control signal at a first logic state responsive to the first voltage and a second logic state responsive to the second voltage;
- and
- an output circuit including a first and a second paths each connected between the input and an output for being switched by the control signal to turn on the first path responsive to the first logic state to thereby transform the first voltage to a third voltage and to turn on the second path responsive to the second logic state to thereby transform the second voltage to the third voltage on the output.
A method for converting dual supply voltages to single supply voltage, the method comprising the steps of:
- inputting a supply voltage at a first voltage or a second voltage smaller than the first voltage;
- generating a control signal at a first logic state responsive to the first voltage and a second logic state responsive to the second voltage;
- and
- switching by the control signal to turn on a first path responsive to the first logic state to thereby transform the first voltage to a third voltage and to turn on a second path responsive to the second logic state to thereby transform the second voltage to the third voltage.
Dependencies are inferred from the claim text.