Reference voltage generating device and generating method of the same
First Claim
1. A reference voltage generating device, comprising:
- an operational amplifier having an enable terminal; and
an intermittent operating means, provided at said enable terminal, for operating said operational amplifier intermittently only during a prescribed time interval.
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Accused Products
Abstract
A reference voltage generating device and method enables dissipation current to be reduced at the time of normal operation. An oscillator outputs a voltage of a low level intermittently during a prescribed time interval. An operational amplifier operates only when an output voltage of the oscillator is a low level. When the output voltage of the oscillator is a high level, a reference voltage “VREF” becomes a floating state so that a level is maintained by compensating the capacity of a capacitor C1. The reference voltage “VREF,” whose electric charge leaks due to a leak at the junction of a transistor, is maintained while operating the operational amplifier during a time interval T in a time period 10 T.
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Citations
8 Claims
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1. A reference voltage generating device, comprising:
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an operational amplifier having an enable terminal; and
an intermittent operating means, provided at said enable terminal, for operating said operational amplifier intermittently only during a prescribed time interval. - View Dependent Claims (2)
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3. A reference voltage generating device, comprising:
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an operational amplifier which has an enable terminal;
two resistors for determining a feedback voltage which is supplied to said operational amplifier;
a transistor for deciding whether or not a route of said feedback voltage to be disconnected occurs;
a capacitor for stabilizing a reference voltage which is an output voltage of said operational amplifier; and
an intermittent operating means for providing a drive voltage in order to operate said operational amplifier intermittently, wherein said intermittent operating means is provided at said enable terminal of said operational amplifier. - View Dependent Claims (4)
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5. A reference voltage generating method that comprises an operational amplifier having an enable terminal, said method comprising the step of:
operating said operational amplifier intermittently only during a prescribed time interval by means of an intermittent operating means, wherein said intermittent operating means is provided at said enable terminal.
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6. A reference voltage generating method that comprises an operational amplifier having an enable terminal, said method comprising the step of:
operating said operational amplifier intermittently only during a prescribed time interval by means of an oscillator, wherein said intermittent operating means is provided at said enable terminal.
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7. A reference voltage generating method that comprises an operational amplifier which has an enable terminal, two resistors for determining a feedback voltage which is supplied to said operational amplifier, a transistor for deciding whether or not a route of said feedback voltage to be disconnected occurs, and a capacitor for stabilizing a reference voltage which is an output voltage of said operational amplifier, said method comprising the step of:
providing a drive voltage in order to operate said operational amplifier intermittently by an intermittent operating means provided at an enable terminal of said operational amplifier.
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8. A reference voltage generating method that comprises an operational amplifier which has an enable terminal, two resistors for determining a feedback voltage which is supplied to said operational amplifier, a transistor for deciding whether or not a route of said feedback voltage to be disconnected occurs, and a capacitor for stabilizing a reference voltage which is an output voltage of said operational amplifier, said method comprising the step of:
providing a drive voltage in order to operate said operational amplifier intermittently by an oscillator provided at an enable terminal of said operational amplifier.
Specification