Operation and modeling of the MOS transistor
Operation and modeling of the MOS transistor
Fundamentals of modern VLSI devices
Fundamentals of modern VLSI devices
Design of Analog CMOS Integrated Circuits
Design of Analog CMOS Integrated Circuits
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A novel current reference based on subthreshold MOSFETs with high power supply rejection ratio (PSRR) is presented. The proposed circuit takes full advantages of the I-V transconductance characteristics of MOSFET operating in the subthreshold region and the enhancement pre-regulator with the high gain negative feedback loop for the current reference core circuit. The proposed circuit, designed with the SMIC 0.18@mm standard CMOS logic process technology, exhibits a stable current of about 1.701@mA with much low temperature coefficient of 2.5x10^-^4@mA/^oC in the temperature range of -40 to 150^oC at 1.5V supply voltage, and also achieves a best PSRR over a broad frequency. The PSRR is about -126dB at dc frequency and remains -92dB at the frequency higher 1MHz. The proposed circuit operates stably at the supply voltage higher 1.2V and has good process compatibility.