Abstract

A Sub-1V, MOS-only Voltage Reference Circuit (VRC) has been proposed with the utmost of transistors working as subthreshold region for low-supply and low-power applications. A supply-insensitive current is passed to Active Load Circuit (ALC) for supply and temperature independence at the output reference voltage. It has four current mirrors connected in a closed loop configuration to generate a supply-independent current which is passed through the ALC resulting supply and temperature insensitive output reference voltage. The ALC has a combination of two subthreshold NMOS transistors having different threshold voltages. The presented VRC is simulated using standard 90 nm CMOS model for 0.25-1 V supply voltage range. The simulation result gives minimum operating voltage required as 0.25 V for which all transistors work in their respective region of operation. For the supply range of 0.25-1 V, the obtained mean voltage reference is 100.4 mV with the line regulation of 0.186 mV/V. The temperature coefficient (TC) of 51ppm/°C is achieved for a wide temperature range of -50 to 135°C with the given minimal operating supply voltage. The power dissipation for minimal supply voltage at room temperature is 33 nW. The proposed VRC exhibits a high PSRR of -52.5 dB at 100Hz and -29 dB at 1 MHz.

Highlights

  • The reference voltage generator circuits are the vital block of analog as well as the mixed analog System on Chip (SoC)

  • The proposed Sub-1V, subthreshold MOS-only Looped Current Mirror Voltage Reference (LCMVR) is implemented in 90 nm CMOS technology

  • From the results shown in Tab. 2, it is concluded that the proposed LCMVR has better performance in terms of PSRR, and LR than work reported in [21]

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Summary

Introduction

The reference voltage generator circuits are the vital block of analog as well as the mixed analog System on Chip (SoC). For the need of ultra-low-power and lowvoltage applications like portable multimedia devices and compact medical devices, the use of BJTs for conventional bandgap references is restricted as it cannot satisfy the demand of low-power, as well as compact area requirements of today’s need of technology as it has bulky size and higher bandgap voltage i.e. in the range of around 1.2 [1] This demand of low-voltage and low-power applications is fulfilled by a Sub-1V VRCs with most of the MOS transistors of the designed circuit operating in the subthreshold region. Another CMOS subthreshold VRC for low-voltage and low-power without resistor and BJT is presented in [21] It has used a bulk driven technique to generate the supply independent current where most of the transistors are working in the subthreshold region. They have high power supply noise effect at the output

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