Analog to digital converter with low power control
DCFirst Claim
1. A circuit comprising:
- a reference voltage generating circuit having an input and an output terminal for providing a reference voltage;
a first switch having a first terminal coupled to a first power supply voltage terminal, a second terminal coupled to the input and the output terminal of the reference voltage generating circuit, and a control terminal for receiving a first control signal;
a second switch having a first terminal coupled to the input and the output terminal of the reference voltage generating circuit, a second terminal, and a control terminal for receiving a second control signal; and
a capacitive element having a first plate electrode coupled to the second terminal of the second switch, and a second plate electrode coupled to a second power supply voltage terminal.
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Abstract
A circuit comprises a reference voltage generating circuit, a first switch, a second switch, and a capacitive element. The reference voltage generating circuit has an input and output terminal for providing a reference voltage. The first switch has a first terminal coupled to a first power supply voltage terminal, a second terminal coupled to the input terminal of the reference voltage generating circuit, and a control terminal for receiving a first control signal. The second switch has a first terminal coupled to the output terminal of the reference voltage generating circuit, a second terminal, and a control terminal for receiving a second control signal. The capacitive element has a first plate electrode coupled to the second terminal of the second switch, and a second plate electrode coupled to a second power supply voltage terminal.
13 Citations
20 Claims
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1. A circuit comprising:
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a reference voltage generating circuit having an input and an output terminal for providing a reference voltage; a first switch having a first terminal coupled to a first power supply voltage terminal, a second terminal coupled to the input and the output terminal of the reference voltage generating circuit, and a control terminal for receiving a first control signal; a second switch having a first terminal coupled to the input and the output terminal of the reference voltage generating circuit, a second terminal, and a control terminal for receiving a second control signal; and a capacitive element having a first plate electrode coupled to the second terminal of the second switch, and a second plate electrode coupled to a second power supply voltage terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A circuit comprising:
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a voltage divider comprising a plurality of series-connected resistive elements; a first switch having a first terminal coupled to a first power supply voltage terminal, a second terminal coupled to the plurality of series-connected resistive elements, and a control terminal for receiving a first control signal; a second switch having a first terminal coupled to the plurality of resistive elements, a second terminal, and a control terminal for receiving a second control signal; and a capacitive element having a first plate electrode coupled to the second terminal of the second switch, and a second plate electrode coupled to a second power supply voltage terminal. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method comprising:
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determining that a circuit is needed to perform a first task requiring a first accuracy; causing a reference voltage generating circuit to operate in an active mode; providing a power supply voltage to the reference voltage generating circuit; coupling a capacitor to the reference voltage generating circuit; providing a reference voltage having the first accuracy from the reference voltage generating circuit to the circuit; determining that the circuit is to operate in a low power mode; causing the reference voltage generating circuit to enter the low power mode; decoupling the power supply voltage from the reference voltage generating circuit; decoupling the capacitor from the reference voltage generating circuit; determining that the circuit is needed for a second task requiring a second accuracy, the second accuracy being less than the first accuracy; providing the power supply voltage to the reference voltage generating circuit; causing the reference voltage generating circuit to operate in a low accuracy active mode; and performing the second task at the second accuracy with the capacitor decoupled from the reference voltage generating circuit in the low accuracy active mode. - View Dependent Claims (18, 19, 20)
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Specification