Title :
Precision, temperature and supply independent CMOS current source with no external components
Author_Institution :
Medtronic Inc., Tempe, AZ, USA
fDate :
12/5/2002 12:00:00 AM
Abstract :
A precision, CMOS current generation circuit, using no external components, which is independent of temperature and supply voltage, is described. The only process parameter which affects it is the oxide thickness, which, typically, varies less than +/-10%. The operation utilises charging an on-chip capacitor within a clock defined time period by a feedback controlled current to a reference voltage. The clocking noise is effectively isolated from the output by three orders of magnitude.
Keywords :
CMOS analogue integrated circuits; circuit simulation; constant current sources; integrated circuit design; clock defined time period; clocking noise isolation; constant current source; feedback controlled current; on-chip capacitor charging; oxide thickness; precision CMOS current source; process parameter; reference voltage; supply voltage independence; temperature independence;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20020762
