Reference voltage generation circuit for comparator
First Claim
1. A reference voltage generation circuit for a comparator having an operational amplifier connected between a power supply voltage and a ground voltage, an inverting terminal of the operational amplifier receives an input voltage and a non-inverting terminal of which receives a reference voltage, comprising:
- a first sample/hold unit for sampling and holding a periodic output voltage in accordance with a first clock signal;
a second sample/hold unit for sampling and holding an output voltage from said first sample/hold unit in accordance with a second clock signal;
a non-linear unit for outputting a non-linear voltage having a sawtooth-shaped transfer characteristic in accordance with an output voltage from said second sample/hold unit; and
an addition unit for adding the non-linear voltage signal from said non-linear unit and an externally applied voltage and outputting the periodic output voltage to said first sample/hold unit and as the reference voltage to the operational amplifier of the comparator.
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Accused Products
Abstract
A reference voltage generation circuit which is capable of generating a reference voltage having multiple steps by using a periodic response characteristic of a chaotic circuit. The circuit includes a first sample/hold unit for sampling and holding a periodic output voltage V3 in accordance with a first clock signal CLK1 from an externally connected clock signal generation unit, a second sample/hold unit for sampling and holding an output voltage V3'"'"' from the first sample/hold unit in accordance with a second clock signal CLK2 from the externally connected clock signal generation unit, a non-linear unit for receiving voltage V4 from the second sample/hold unit and outputting a non-linear voltage V2 signal having a sawtooth-shaped transfer characteristic, and an addition unit for adding the non-linear voltage signal V2 from the non-linear unit and an externally applied voltage signal V1 and outputting the periodic output voltage V3.
12 Citations
18 Claims
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1. A reference voltage generation circuit for a comparator having an operational amplifier connected between a power supply voltage and a ground voltage, an inverting terminal of the operational amplifier receives an input voltage and a non-inverting terminal of which receives a reference voltage, comprising:
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a first sample/hold unit for sampling and holding a periodic output voltage in accordance with a first clock signal; a second sample/hold unit for sampling and holding an output voltage from said first sample/hold unit in accordance with a second clock signal; a non-linear unit for outputting a non-linear voltage having a sawtooth-shaped transfer characteristic in accordance with an output voltage from said second sample/hold unit; and an addition unit for adding the non-linear voltage signal from said non-linear unit and an externally applied voltage and outputting the periodic output voltage to said first sample/hold unit and as the reference voltage to the operational amplifier of the comparator. - View Dependent Claims (2, 3, 4)
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5. A reference voltage generating circuit, comprising:
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a signal generating unit responsive to an input voltage to generate a non-linear signal, said signal generating unit combining the non-linear signal with an externally applied voltage to provide a reference voltage; and a sample and hold circuit coupled to said signal generating unit for receiving the reference voltage, said sample and hold circuit responsive to two different clock signals, which do not overlap with each other, for providing the input voltage to said signal generating unit. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification