Temperature Compensated Current Reference Controlled by Feedback
Zhaoji Li · Dianzi qijian · 2007
A non-bistable bootstrap current reference is presented.The novel reference current is determined by feedback,and also temperature compensation is realized.Compared with traditional bootstrap current reference,the novel one avoids bistable state and could be started up fast with good temperature compensation.Using UMC 0.6 μm BCD technology,2 μA reference current has been designed.Its start-up time is 1 μs under the power slope of 5 V/μs,and its TCF is 105×10-6/℃(105PPm/℃) in the temperature rang of-25~70℃.It is suitable to set the gain of core current mirror to 10 by discussing the influence of circuit parameter on performance.