The performance of PTAT and CTAT voltage generation circuits can be optimized using IC as design parameter which gives the sizing factor for MOSFETs. a resistor supply). However, this type of reference is unsuitable for sub-nA current generation as it requires an extremely large resistor of 1GΩ or more. 1. To minimize production cost, it uses no BJTs, external components or trimming procedures. I1 has to come from somewhere (e.g. Basic and advanced current references Afshin Haft-Baradaran University of Toronto E-mail: afshinhf@eecg.utoronto.ca Abstract: Two main reasons for variation of current output of current source are temperature depen-dency and process dependency of output current. A simple modification to the existing circuit was proposed to enhance the loop-gain by Abstract— In this paper, supply, process & temperature compensated, low voltage current reference for CMOS integrated circuits is presented. November 27, 2002; All rights reserved Page 6 of 15 FIGURE 5. The role of complimentary to absolute temperature (CTAT) circuit in current mode bandgap has been described. Therefore in current references we try to com- pensate these two major factors. I1 can be PTAT, CTAT or constant. Applying Eq.
Handout #20: EE214 Fall 2002 Voltage References and Biasing ©1993 Thomas H. Lee; rev. Further, a start-up circuit is needed to prevent the circuit from becoming Suhas Vishwasrao Shinde . 2. The TC for CTAT voltage which remains constant, can be computed analytically using continuous interpolation equation of drain current. It uses the fact that MOS transistor VGS will drop with temperature. When two MOS transistors (M1 and M2) share the same gate voltage (VG), both have the same pinch-ofi voltage (VP).
We will flrst review a couple of general expressions that will be used later on. 1(a)).
To first order. Loop-gain problems with the existing self-bias MOS-based CTAT generator were discussed. This circuit is designed in Intel-22nm process and evaluated by computer simulations. See below for a simple way to do this. PVT Insensitive Reference Current Generation . PTAT Voltage Generator based on an MOS Voltage Divider ... current in such a way that the inversion level remains constant over temperature. I2 will still be CTAT. Many conventional current reference circuits are variations of the β-multiplier current reference (Fig.
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