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EP0104752A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

A bias voltage supply circuit

Assignee: Toshiba Corp
•
Filing: 1983-08-19
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Granted: —
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Expires: 2003-08-19
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Abstract

Abstract A bias voltage supply circuit having a relatively stable constant voltage during load current fluctuations and driven by a relatively low DC power supply voltage, includes a DC power supply terminal (10), a DC current source (16), a first transistor (26) connected at its collector to the DC power supply terminal via the DC current source, a first resistor (20) connected between the emitter of the first transistor and a reference potential terminal (14), a second transistor (28) connected by its collector-emitter circuit in parallel with the series circuit of the DC current source and the first transistor, the base of the second transistor being connected to the collector of the first transistor, a second resistor (30) connected in parallel with the collector-base circuit of the first transistor and an output terminal (22) connected to the base of the first transistor.

Inventors

  • 👤 Hisao C/O Patent Division Kuwahara

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-31 18:18
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/30; H03F1/302; G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/22

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 128 words
A bias voltage supply circuit comprising: a DC power supply terminal (10); a DC current source (16); a first transistor (26) connected at its collector to said DC power supply terminal via said DC current source; a resistor (20) connected between the emitter of said first transistor and a reference potential terminal (14); a second transistor (28) connected by its collector- emitter circuit in parallel with the series circuit of said DC current source and said first transistor, the base of said second transistor being connected to the collector of said first transistor; and an output terminal (22) connected to the base of said first transistor, characterised in that the circuit further comprises: a second resistor (30) connected in parallel with the collector-base circuit of said first transistor.
Claim 2
Dependent Claim 128 words
A bias voltage supply circuit comprising: a DC power supply terminal (10); a DC current source (16); a first transistor (26) connected at its collector to said DC power supply terminal via said DC current source; a resistor (20) connected between the emitter of said first transistor and a reference potential terminal (14); a second transistor (28) connected by its collector- emitter circuit in parallel with the series circuit of said DC current source and said first transistor, the base of said second transistor being connected to the collector of said first transistor; and an output terminal (22) connected to the base of said first transistor, characterised in that the circuit further comprises: a second resistor (30) connected in parallel with the collector-base circuit of said first transistor.
Claim 3
Dependent Claim 71 words
A bias voltage supply circuit according to claim 1, characterised in that the resistance (R2) of said second resistor (30) is given by the equation: where Vt = thermal voltage = kT/q, k = Boltzman's constant, T = absolute temperature, q = electron charge, Iout = output current at said output terminal (22), I1 = current supplied from said DC current source (16), R1 = resistance of said first resistor (20).

References Cited (Backward Citations)

US3660694A Cited
US4057789A Cited
US3939434A Cited

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