Reference voltage generator
First Claim
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1. A reference voltage generator, comprising:
- an electrostatic discharge (ESD) resistor;
a first branch coupled to the ESD resistor and including a first capacitor;
a second branch coupled to the ESD resistor and including a second capacitor, wherein the first and second capacitors are coupled in parallel;
a first switch configured to control a first charge transfer path leading to the first branch; and
a second switch configured to control a second charge transfer path leading to the second branch,wherein the first switch is controlled by a first clock signal and the second switch is controlled by a second clock signal,wherein at least one of frequency and duty ratio of the first clock signal is changed for tuning a resistance value of the ESD resistor.
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Abstract
A reference voltage generator including an electrostatic discharge (ESD) resistor, a first branch coupled to the ESD resistor and including a first capacitor, a second branch coupled to the ESD resistor and including a second capacitor, wherein the first and second capacitors are coupled in parallel, a first switch configured to control a first charge transfer path leading to the first branch, and a second switch configured to control a second charge transfer path leading to the second branch.
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Citations
18 Claims
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1. A reference voltage generator, comprising:
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an electrostatic discharge (ESD) resistor; a first branch coupled to the ESD resistor and including a first capacitor; a second branch coupled to the ESD resistor and including a second capacitor, wherein the first and second capacitors are coupled in parallel; a first switch configured to control a first charge transfer path leading to the first branch; and a second switch configured to control a second charge transfer path leading to the second branch, wherein the first switch is controlled by a first clock signal and the second switch is controlled by a second clock signal, wherein at least one of frequency and duty ratio of the first clock signal is changed for tuning a resistance value of the ESD resistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A reference voltage generator, comprising:
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an electrostatic discharge (ESD) resistor; a first switch configured to control a charge transfer path leading from the ESD resistor; a second switch connected to the first switch in series; a first capacitor provided between the first switch and the second switch and coupled in parallel to the first switch and the second switch; and a second capacitor coupled to the first capacitor in parallel, wherein the first switch is controlled by a first clock signal and the second switch is controlled by a second clock signal, wherein at least one of frequency and duty ratio of the first clock signal is changed for tuning a resistance value of the ESD resistor. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A reference voltage generator, comprising:
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a first resistor having a first terminal connected to a power voltage; a first switch connected to a second terminal of the first resistor; a second switch connected in series to the first switch; a first capacitor having a first terminal connected between the first and second switches and a second terminal connected to a ground voltage; a second capacitor having a first terminal connected to the second switch and a second terminal connected to an input of an operational amplifier, wherein the first and second switches are controlled by first and second clock signals, respectively; a third switch connected to the first terminal of the first resistor and the first terminal of the second capacitor, wherein the third switch is controlled by a third clock signal; and a fourth switch connected to the second terminal of the second capacitor, wherein the fourth switch is controlled by the first clock signal. - View Dependent Claims (17, 18)
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Specification