Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1993-02-05
1996-01-09
Wong, Peter S.
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
323313, G05F 308
Patent
active
054831504
ABSTRACT:
A bias voltage source (20) produces a variable bias voltage (VBREF) which regulates the bias currents in an array (30) of transistor current switch cells (34,36) in an digital-to-analog converter (DAC). The bias voltage (VBREF) is applied to the bases of the regulating transistors (Q8') in the cells (34,36) to regulate the bias currents in their respective main transistors (Q6',Q7') to values proportional to the main bias current (IBIAS). Each main transistor (Q6,Q6',Q7,Q7') and regulating transistor (Q8,Q8') is provided with a compensating transistor (Q10,Q10')(Q11,-Q11') which sinks the emitter-base current thereof and cancels deviation of the actual current gain from the design current gain. Another compensating transistor (Q9,Q9') is connected to each regulating transistor (Q8,Q8') to cancel the effect of base-emitter voltage variation with temperature.
REFERENCES:
patent: 4393370 (1983-07-01), Hareyama
patent: 4771227 (1988-09-01), Nelson
patent: 4952867 (1990-08-01), Anderson et al.
patent: 5070332 (1991-12-01), Kaller et al.
"Bipolar and MOS Analog Integrated Circuit Design", by A. B. Grebene, J. Wiley & Sons, 1984, Chapter 14 entitled, "Data Conversion Circuits: Digital-to-Analog Conversion", pp. 753-824.
Birdsall Dwight D.
Elliott Phillip L.
Linder Lloyd F.
Tran Kelvin T.
Berhane Adolf D.
Denson-Low Wanda K.
Grunebach Georgann S.
Hughes Aircraft Company
Wong Peter S.
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