Loading...

A new low voltage precision CMOS current reference with no external components

Dehghani, R ; Sharif University of Technology | 2003

243 Viewed
  1. Type of Document: Article
  2. DOI: 10.1109/TCSII.2003.820239
  3. Publisher: 2003
  4. Abstract:
  5. A novel current reference with low temperature and supply sensitivity and without any external component has been developed in a 0.25 μm mixed-mode process. The circuit is based on a bandgap reference (BGR) voltage and a CMOS circuit similar to a beta multiplier. An NMOS transistor in triode region has been used in place of a resistor in conventional beta multiplier to achieve a current which has a negative temperature coefficient and only oxide thickness dependent. The BGR voltage has a positive temperature coefficient to cancel the negative temperature coefficient of the beta multiplier. The simulation results using Bsim3v3 model show max-to-min fluctuation of less than 1 % over a temperature range of -20°C to +100°C and a supply voltage range of 1.4 V to 3 V with ±30% tolerance for all of the used on-chip resistors. The maximum current variation is slightly less than the oxide thickness variation in the process corners
  6. Keywords:
  7. Low voltage ; Fluctuations ; Temperature dependence ; Temperature sensors ; Capacitors ; MOSFETs ; Resistors ; Circuits ; Photonic band gap ; Operational amplifiers
  8. Source: IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing ; Volume 50, Issue 12 , 2003 , Pages 928-932 ; 10577130 (ISSN)
  9. URL: https://ieeexplore.ieee.org/document/1255676