Reference voltage circuit
First Claim
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1. A method, comprising:
- changing an output impedance value coupled to an output of a reference voltage circuit; and
detecting when an output of the reference voltage circuit reaches a predetermined voltage level, wherein detecting when the output of the reference voltage circuit reaches the predetermined voltage level comprises comparing an external voltage to a voltage from the reference voltage circuit, wherein the comparison of the two voltages is used to set the output impedance value, and wherein changing the output impedance value comprises tuning the output of the variable resistance circuit using a delay circuit.
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Abstract
A method and apparatus for power supply rejection in a reference voltage circuit using a variable resistance circuit.
16 Citations
13 Claims
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1. A method, comprising:
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changing an output impedance value coupled to an output of a reference voltage circuit; and detecting when an output of the reference voltage circuit reaches a predetermined voltage level, wherein detecting when the output of the reference voltage circuit reaches the predetermined voltage level comprises comparing an external voltage to a voltage from the reference voltage circuit, wherein the comparison of the two voltages is used to set the output impedance value, and wherein changing the output impedance value comprises tuning the output of the variable resistance circuit using a delay circuit. - View Dependent Claims (2)
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3. An apparatus, comprising:
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a reference voltage circuit having a first output; and a variable resistance circuit coupled to the first output of the reference voltage circuit, the variable resistance circuit to adjust an output load of the reference voltage circuit, wherein the variable resistance circuit comprises; a voltage detection circuit to compare a voltage from the reference voltage circuit to an external reference voltage; a delay circuit coupled to an output of the voltage detection circuit, the delay circuit to tune an output of the variable resistance circuit; and a variable resistor circuit comprising a plurality of resistance values coupled to an output of the delay circuit. - View Dependent Claims (4, 5, 6, 7)
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8. An apparatus, comprising:
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a reference voltage circuit having a first output; and a variable resistance circuit coupled to the first output of the reference voltage circuit, the variable resistance circuit to adjust an output load of the reference voltage circuit, wherein the variable resistance circuit comprises; a voltage detection circuit to compare a voltage from the reference voltage circuit to an external reference voltage; a delay circuit coupled to an output of the voltage detection circuit, the delay circuit to tune an output of the variable resistance circuit; and a digital-control switch coupled to an output of the delay circuit. - View Dependent Claims (9, 10)
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11. An apparatus, comprising:
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means for adjusting an output load of a reference voltage circuit to achieve a predetermined level of power supply rejection for the reference voltage circuit; and means for detecting when an output of the reference voltage circuit reaches a predetermined voltage level, wherein the means for adjusting comprises; means for comparing a voltage from the reference voltage circuit to an external reference voltage; and means for tuning an output of the means for adjusting the output load of the reference voltage circuit. - View Dependent Claims (12, 13)
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Specification