Super-PTAT current source

Details Super-PTAT current source Super-PTAT current source

2006-07-11

2006-07-11

Zweizig, Jeffrey (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

C327S513000

Reexamination Certificate

active

07075360

ABSTRACT:
A super-PTAT current source receives a PTAT reference voltage as input. The PTAT reference voltage is combined with the gate-to-source voltage difference of two unequal-area input transistors and the combined voltage is imposed on a high negative temperature coefficient resistor to produce an output current that is super-PTAT. A current source supplies a bias current to the super-PTAT current source whereby excess current provided by the current source is consumed by closed loop adjustments. The super-PTAT current source generates a super-PTAT current having a constant slope, excellent stability and very good linearity. In one embodiment, the super-PTAT output current is mixed with a sub-PTAT current in a preselected ratio to generate output currents having exactly the desired temperature coefficient.

REFERENCES:
patent: 4176308 (1979-11-01), Dobkin et al.
patent: 4249122 (1981-02-01), Widlar
patent: 4350904 (1982-09-01), Cordell
patent: 4447784 (1984-05-01), Dobkin
patent: 4604568 (1986-08-01), Prieto
patent: 5543746 (1996-08-01), Kuo
patent: 5604467 (1997-02-01), Matthews
patent: 6181191 (2001-01-01), Paschal
patent: 6265857 (2001-07-01), Demsky et al.

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