Patent ID: 6255887
Filing Date: 2001-07-03
Classification: G05F

Abstract:
A variable transconductance current mirror circuit comprising:a first field effect transistor having a gate, a source, and a drain;a second field effect transistor having a gate, a source, and a drain, the gate of the second transistor coupled to the gate of the first transistor;a current source coupled to the gates of the first and second transistors;a voltage supply coupled to the sources of the first and second transistors; anda first diode having an anode and a cathode, the anode of the first diode coupled to the gates of the first and second transistors, the cathode of the first diode coupled to the source of the first and second transistors, the first diode comprising a zener diode having a reverse breakdown voltage operable to prevent oxide breakdown of the first and second transistors.