A Widlar current source is a modification of the basic two-transistor current mirror that incorporates an emitter degeneration resistor for only the output transistor, enabling the current source to generate low currents using only moderate resistor values.[1][2][3]
The Widlar circuit may be used with bipolar transistors, MOS transistors, and even vacuum tubes. An example application is the 741 operational amplifier,[4] and Widlar used the circuit as a part in many designs.[5]
This circuit is named after its inventor, Bob Widlar, and was patented in 1967.[6][7]
^PR Gray, PJ Hurst, SH Lewis & RG Meyer (2001). Analysis and design of analog integrated circuits (4th ed.). John Wiley and Sons. pp. §4.4.1.1 pp. 299–303. ISBN 0-471-32168-0.{{cite book}}: CS1 maint: multiple names: authors list (link)
^AS Sedra & KC Smith (2004). Microelectronic circuits (5th ed.). Oxford University Press. Example 6.14, pp. 654–655. ISBN 0-19-514251-9.
^MH Rashid (1999). Microelectronic circuits: analysis and design. PWS Publishing Co. pp. 661–665. ISBN 0-534-95174-0.
^AS Sedra & KC Smith (2004). §9.4.2, p. 899 (5th ed.). ISBN 0-19-514251-9.
^See, for example, Figure 2 in IC voltage regulators.
^RJ Widlar: US Patent Number 03320439; Filed May 26, 1965; Granted May 16, 1967: Low-value current source for integrated circuits
^See Widlar: Some circuit design techniques for linear integrated circuits and Design techniques for monolithic operational amplifiers
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filed a patent in 1963 and published this circuit concept in 1964. Bob Widlar, Paul Brokaw and others followed up with other commercially-successful versions...
their functioning. People who have specialized in this field include Bob Widlar, Bob Pease, Hans Camenzind, George Erdi, Jim Williams, and Barrie Gilbert...
transistors. Widlar used this same trick in μA702 and μA709 The base drive for input transistors Q1/Q2 is the input bias current and must be sourced externally...
Robert Widlar to design analog operational amplifiers using Fairchild's process. Since Fairchild's processes were optimized for digital circuits, Widlar collaborated...
company's spin-off, National Semiconductor, with Charles E. Sporck and Bob Widlar.: 259 At National Semiconductor they made the-then bold move of assembling...
This method is common in monolithic temperature sensors.[citation needed] Widlar, R.J. (January 1967). "An exact expression for the thermal variation of...
control, radar Uncas A. Whitaker Founder of AMP Inc. and philanthropist Bob Widlar Integrated circuits Niklaus Wirth Computer programming languages Steve Wozniak...
front end. There is no physical 2.495 V source: the actual internal reference is provided by a 1.2 V Widlar bandgap (transistors T3, T4, T5), driven...
transistor-transistor logic (TTL) ICs, which became a commercial success. Bob Widlar from Fairchild made a similar breakthrough in 1964–1965 in analog ICs (operational...
converter – Current (electricity) – Current density – Current division – Currentsource inverter – Currentsource – Current transformer – Current-to-voltage...
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