Patent US5789906A successfully refreshed from Google Patents.
US5789906A
Expired / Lapsed
US
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Reference voltage generating circuit and method
Assignee: Toshiba Corp
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Filing: 1997-04-08
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Granted: 1998-08-04
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Expires: 2017-04-08
Abstract
Abstract A reference voltage generating circuit generates a predetermined reference voltage being independent of the dispersion of manufacturing lots. The base and the collector of a transistor is connected to a first input terminal of an operational amplifier. A resistor is connected between a second input terminal and an output terminal of the operational amplifier. The output terminal outputs the reference voltage. A voltage independent of the current amplification factor of the transistor is supplied to the input terminal of the operational amplifier via the transistor. And, a current independent of the reference voltage is supplied to the second input terminal of the operational amplifier. Here, a current proportional to the current amplification factor of the transistor is supplied to the base and the collector of the transistor.
Inventors
- 👤 Yasuo Mizuide
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:36
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/30
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
107 words
A reference voltage generating circuit, comprising: an operational amplifier having a first input terminal, a second input terminal, and an output terminal for outputting a reference voltage; voltage supplying means having at least one first transistor, for supplying a voltage independent of a current amplification factor of the first transistor to the first input terminal of the operational amplifier via the first transistor; a resistor connected between the second input terminal and the output terminal of the operational amplifier; and first current supplying means for supplying a first predetermined current independent of the reference voltage to the second input terminal of the operational amplifier via the resistor.
Claim 2
Dependent Claim
107 words
A reference voltage generating circuit, comprising: an operational amplifier having a first input terminal, a second input terminal, and an output terminal for outputting a reference voltage; voltage supplying means having at least one first transistor, for supplying a voltage independent of a current amplification factor of the first transistor to the first input terminal of the operational amplifier via the first transistor; a resistor connected between the second input terminal and the output terminal of the operational amplifier; and first current supplying means for supplying a first predetermined current independent of the reference voltage to the second input terminal of the operational amplifier via the resistor.
Claim 3
Dependent Claim
39 words
The reference voltage generating circuit of claim 1, wherein an emitter of the first transistor is connected to ground, and a base and a collector thereof are connected in common to the first input terminal of the operational amplifier.
Claim 4
Dependent Claim
43 words
The reference voltage generating circuit of claim 2, wherein the voltage supplying means further comprises second current supplying means for supplying a current proportional to a current amplification factor of the first transistor to the base and the collector of the first transistor.
Claim 5
Dependent Claim
78 words
The reference voltage generating circuit of claim 3, wherein the second current supplying means includes a second transistor having a current amplification factor roughly equal to a current amplification factor of the first transistor and an emitter connected to the collector of the first transistor, thus the second current supplying means supplying the current proportional to the current amplification factor of the first transistor to the base and the collector of the first transistor via the second transistor.
Claim 6
Dependent Claim
63 words
The reference voltage generating circuit of claim 1, wherein the first current supplying means comprises a current mirror circuit connected to the resistor, the current mirror circuit being activated, when supplied with a second predetermined current, in such a way that the current supplied to the second input terminal of the operational amplifier via the resistor is equalized to the first predetermined current.
Claim 7
Dependent Claim
116 words
The reference voltage generating circuit of claim 5, wherein the current mirror circuit comprises a second transistor having a base and a collector connected to each other, and a third transistor having a base connected to the base of the third transistor, the second predetermined current being supplied to the collector of the second transistor in such a way that a current ratio (I2/IS2)/(I3/IS3) of the second and third transistors is set to a roughly constant value, where I2 is a collector current of the second transistor; I3 is a collector current of the third transistor; IS2 is a saturated emitter current of the second transistor; IS3 is a saturated emitter current of the third transistor.
Claim 8
Dependent Claim
136 words
A compactor circuit, comprising: an operational amplifier having a first input terminal, a second input terminal, and an output terminal for outputting a reference signal having a reference voltage; voltage supplying means having at least one transistor, for supplying a voltage independent of a current amplification factor of the transistor to the first input terminal of the operational amplifier via the transistor; a resistor connected between the second input terminal and the output terminal of the operational amplifier; current supplying means for supplying a predetermined current independent of the reference voltage to the second input terminal of the operational amplifier via the resistor; and a comparator for comparing an input signal with the reference signal in voltage level to output an output signal corresponding to a comparison result between the input signal and the reference signal.
Claim 9
Dependent Claim
136 words
A compactor circuit, comprising: an operational amplifier having a first input terminal, a second input terminal, and an output terminal for outputting a reference signal having a reference voltage; voltage supplying means having at least one transistor, for supplying a voltage independent of a current amplification factor of the transistor to the first input terminal of the operational amplifier via the transistor; a resistor connected between the second input terminal and the output terminal of the operational amplifier; current supplying means for supplying a predetermined current independent of the reference voltage to the second input terminal of the operational amplifier via the resistor; and a comparator for comparing an input signal with the reference signal in voltage level to output an output signal corresponding to a comparison result between the input signal and the reference signal.
Claim 10
Independent Claim
111 words
A method of generating a reference voltage by use of a circuit having an operational amplifier, a transistor having a base and a collector both connected to a first input terminal of the operation amplifier and an emitter connected to ground, and a resistor connected between a second input terminal and an output terminal of the operational amplifier, the method comprising the steps of: supplying a voltage independent of a current amplification factor of the transistor to the first input terminal of the operational amplifier via the transistor; and supplying a first predetermined current independent of the reference voltage to the second input terminal of the operational amplifier via the resistor.
Claim 11
Independent Claim
111 words
A method of generating a reference voltage by use of a circuit having an operational amplifier, a transistor having a base and a collector both connected to a first input terminal of the operation amplifier and an emitter connected to ground, and a resistor connected between a second input terminal and an output terminal of the operational amplifier, the method comprising the steps of: supplying a voltage independent of a current amplification factor of the transistor to the first input terminal of the operational amplifier via the transistor; and supplying a first predetermined current independent of the reference voltage to the second input terminal of the operational amplifier via the resistor.
Claim 12
Dependent Claim
42 words
The method of generating a reference voltage of claim 8, wherein the current supplying step comprises the step of supplying a current proportional to the current amplification factor of the first transistor to the base and the collector of the first transistor.
Claim 13
Dependent Claim
77 words
The method of generating a reference voltage of claim 8, wherein the current supplying step further comprises the steps of: connecting a current mirror circuit to the second input terminal of the operational amplifier; and supplying a second predetermined current to the current mirror circuit, to activate the current mirror circuit in such a way that current supplied to the second input terminal of the operational amplifier via the resistor is equalized to the first predetermined current.
Claim 14
Dependent Claim
137 words
The method of generating a reference voltage of claim 10, wherein the second predetermined current supplying step comprises the step of supplying the second predetermined current to the current mirror circuit having a first transistor having a base and a collector connected in common and a second transistor having a base connected to the base of the first transistor, in such a way that the second predetermined current is supplied to the collector of the first transistor so that a current ratio (I1/IS1)/(I2/IS2) of the first and the second transistors is set to a roughly constant value, where I1 is a collector current of the first transistor; I3 is a collector current of the second transistor; IS1 is a saturated emitter current of the first transistor; and IS2 is a saturated emitter current of the second transistor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-08-03 | 2002-02-02 | 2002-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-03 | 2006-02-02 | 2006-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-03 | 2010-02-02 | 2010-08-04 | $7700.00 | Window Closed / Lapsed |