Field effect transistor current source

Details Field effect transistor current source Field effect transistor current source

G - Physics

05

F

328/186, 323/4

G05F 3/28 (2006.01) G05F 3/26 (2006.01)

Patent

CA 1252835

- 22 - A FIELD EFFECT TRANSISTOR CURRENT SOURCE Abstract A field effect transistor circuit generates a reference current (IR) that can obtain a desired temperature coefficient. The circuit is self-compensatory with respect to process variations, in that a "slow" process will produce a higher than normal current, while a "fast" process will give a lower one. This results in a tight spread of slew-rate, gain, gain-bandwidth, etc. in op-amps, comparators, and other linear circuits. A simple adjustment in the circuit allows the temperature coefficient to be made positive or negative if so desired. An illustrative circuit is shown for CMOS technology, but can be applied to other field effect technologies.

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