EP0601540A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Reference voltage generator of a band-gap regulator type used in CMOS transistor circuit
Assignee: NEC Corp
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Filing: 1993-12-07
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Granted: —
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Expires: 2013-12-07
Abstract
Abstract A reference voltage generator of the so-called band-gap regulator type is disclosed, which includes a pair of bipolar transistors, a resistor circuit coupled to the bipolar transistors to make them operative in different current densities from each other to thereby produce a voltage relative to a difference in base-emitter voltage between the transistors, and an operational amplifier coupled to receive the voltage to control a current flowing through the resistor circuit, and further includes a level shifter inserted between the resistor circuit and the operational amplifier to receive and shift the voltage from the resistor circuit, the level shifter thereby shifting the voltage to produce a level-shifted voltage and the operational amplifier receiving the level-shifted voltage.
Inventors
- 👤 Shin-Ichi C/O Nec Corporation Koazechi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 14:38
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/30; G05F3/26; G05F3/267
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
98 words
A reference voltage generator comprising first and second bipolar transistors, a resistor circuit coupled to said first and second bipolar transistors to make said first and second bipolar transistors operative in different current densities from each other to thereby produce a predetermined voltage relative to a difference in base-emitter voltages between said first and second bipolar transistors, a level shift circuit receiving and shifting said predetermined voltage to produce a level-shifted voltage, and an operational amplifier composed of field effect transistors and receiving said level-shifted voltage to control a current flowing through said resistor circuit in response thereto.
Claim 2
Dependent Claim
69 words
The generator as claimed in claim 1, wherein said resistor circuit includes a first resistor connected between an emitter of said first bipolar transistor and a reference potential line and second and third resistors connected in series between an emitter of said second bipolar transistor, each of said first and second bipolar transistors having a base supplied with a voltage relative to an output voltage of said operational amplifier.
Claim 3
Dependent Claim
84 words
The generator as claimed in claim 2, wherein said level shift circuit includes a first input node connected to the emitter of said first bipolar transistor, a second input node connected to a connection point of said second and third resistors, a first output node connected to a first input terminal of said operational amplifier and a second output node connected to a second input terminal of said operational amplifier, and a reference voltage is derived from an output terminal of said operational amplifier.
Claim 4
Dependent Claim
124 words
The generator as claimed in claim 3, wherein said level shifter further includes a first field effect transistor connected between the first input terminal of said operational amplifier and said reference potential line and having a gate connected to said first input node, a second field effect transistor connected between the second input terminal of said operational amplifier and said reference potential line and having a gate connected to said second input node, a third field effect transistor connected between said first input terminal and a power supply line and having a gate supplied with a bias voltage, and a fourth field effect transistor connected between said second input terminal and said power supply line and having a gate supplied with said bias voltage.
Claim 5
Dependent Claim
69 words
The generator as claimed in claim 2, further comprising first and second field effect transistors each having a gate supplied with a voltage relative to an output voltage of said operational amplifier, said resistor circuit including a first resistor connected between said first field effect transistor and said first bipolar transistor and second third resistors connected in series between said second field effect transistor and said second bipolar transistor.
Claim 6
Dependent Claim
28 words
The generator as claimed in claim 5, wherein each of said first and second bipolar transistors has a base and a collector connected to a reference potential line.
Claim 7
Dependent Claim
27 words
The generator as claimed in claim 6, wherein a reference voltage is derived from a connection point of said second field effect transistor and said third resistor.
Claim 8
Dependent Claim
83 words
The generator as claimed in claim 7, wherein said operational amplifier has first and second input terminals and said level shifter includes a third field effect transistor connected between said first input terminal and said reference potential line and having a gate connected to an emitter of said first bipolar transistor and a fourth field effect transistor connected between said second input terminal and said reference potential line and having a gate connected to a connection point of said second and third resistors.
Claim 9
Dependent Claim
188 words
A reference voltage generator comprising first and second power lines, a first bipolar transistor having a collector connected to said first power line, an emitter and a base, a second bipolar transistor having a collector connected to said first power line, an emitter and a base, a first resistor connected between the emitter of said first bipolar transistor and said second power line, second and third resistors connected in series between the emitter of said second bipolar transistor and said second power line, an operational amplifier having a first input terminal, a second input terminal and an output terminal, means for connecting the output terminal of said operational amplifier to the bases of said first and second bipolar transistors, a first field effect transistor connected between the first input terminal of said operational amplifier and said second power line and having a gate connected to the emitter of said first bipolar transistor, and a second field effect transistor connected between the second input terminal of said operational amplifier and said second power line and having a gate connected to a connection point of said second and third resistors.
Claim 10
Dependent Claim
53 words
The generator as claimed in claim 9, wherein said connecting means includes fourth and fifth resistors connected in series between the output terminal of said operational amplifier and said second power line, the bases of said first and second bipolar transistors being connected to a connection point of said fourth and fifth resistors.
Claim 11
Dependent Claim
48 words
The generator as claimed in claim 9, further comprising a first current source connected between the first input terminal of said operational amplifier and said first power line and a second current source connected between the second input terminal of said operational amplifier and said first power line.
Claim 12
Dependent Claim
218 words
A reference voltage generator comprising first and second power lines, a first field effect transistor connected between said first power line and a first node, a second field effect transistor connected between said first power line and a second node, a first bipolar transistor having a base and a collector connected to said second power line and an emitter, a second bipolar transistor having a base and a collector connected to said second power line and an emitter, a first resistor connected between said first node and the emitter of said first bipolar transistor, second and third resistors connected in series between said second node and the emitter of said second bipolar transistor, an operational amplifier having a first input terminal, a second input terminal and an output terminal, means for connecting the output terminal of said operational amplifier to gates of said first and second field effect transistors, a third field effect transistor connected between the first input terminal of said operational amplifier and said second power line and having a gate connected to the emitter of said first bipolar transistor, and a fourth field effect transistor connected between the second input terminal of said operational amplifier and said second power line and having a gate connected to a connection point of said second and third resistors.
Claim 13
Dependent Claim
48 words
The generator as claimed in claim 12, further comprising a first current source connected between the first input terminal of said operational amplifier and said first power line and a second current source connected between the second input terminal of said operational amplifier and said first power line.
References Cited (Backward Citations)
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