Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1996-10-30
1999-06-08
Cunningham, Terry D.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327540, 327543, 327545, 327539, 327315, G05F 110
Patent
active
059107499
ABSTRACT:
A bipolar or MOS current reference circuit is provided, which generates a reference current having no temperature dependence and which is able to be operated by a single battery having a supply voltage of approximately 1 V. This circuit includes a first transistor having an emitter or source and a base or gate connected through a resistor, a first current mirror subcircuit generating a first mirror current of an input current flowing through the resistor, and a second current mirror subcircuit generating a second current of the input current flowing through the resistor. The first mirror current has a negative temperature coefficient. The second mirror current has a positive temperature coefficient. The first and second mirror currents are added to generate a sum current having no temperature dependence, which is derived as a reference current. The sum current is supplied to the first transistor to thereby drive the first transistor. The first current mirror subcircuit may be a simple current mirror subcircuit. The second current mirror subcircuit may be a Widlar or Nagata current mirror subcircuit.
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H. Hatada et al., "Reference Current Generator for 3.3V System", Proceedings of the 1994 IEICE Spring Conference, No. C-663, p. 231.
Cunningham Terry D.
NEC Corporation
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