Current source, reference voltage generator, method of defining

Details Current source, reference voltage generator, method of defining Current source, reference voltage generator, method of defining

1997-05-06

1999-08-10

Cunningham, Terry D.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

327543, G05F 316

Patent

active

059363924

ABSTRACT:
A PTAT current source comprising a first branch including a bipolar transistor structure connected in diode configuration, and first and second sub-branches coupled to the bipolar transistor structure, the first sub-branch including a p-channel MOSFET transistor connected in diode configuration and an n-channel MOSFET transistor which is not connected in diode configuration, and the second sub-branch including a p-channel MOSFET transistor not connected in diode configuration and an n-channel MOSFET transistor connected in diode configuration; and a second branch including a bipolar transistor structure connected in diode configuration, and third and fourth sub-branches coupled to the bipolar transistor structure, the third sub-branch including a p-channel MOSFET transistor connected in diode configuration and an n-channel MOSFET transistor which is not connected in diode configuration, and the fourth sub-branch including a p-channel MOSFET transistor not connected in diode configuration and an n-channel MOSFET transistor connected in diode configuration; whereby channel length modulation effects caused by MOSFET transistors in the first branch are cancelled by MOSFETS in the second branch.

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