Temperature and supply independent CMOS current source

Details Temperature and supply independent CMOS current source Temperature and supply independent CMOS current source

2011-05-17

2011-05-17

Hiltunen, Thomas J (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

External effect

Temperature

C327S539000

Reexamination Certificate

active

07944271

ABSTRACT:
An improved current source may provide an improvement over a typical ΔVgs-type current source. The improved current source may comprise two branches. A first branch may be configured to generate a PTC (proportional to absolute temperature) current based on a ΔVgsdeveloped across a resistor. A second branch may be configured to generate an NTC (inversely proportional to absolute temperature) current. The PTC current and NTC current may be combined to obtain a third current having a magnitude that is the sum of the respective magnitudes of the PTC current and the NTC current, and a temperature coefficient that is a combination of the respective temperature coefficients of the PTC current and NTC current. The current source may be configured to generate the NTC current and PTC current to be substantially insensitive to variations in the supply voltage.

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