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  4. Vol 3, Issue 1, 2020

A novel voltage reference circuit without amplifier

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DOI: 10.23977/jeeem.2020.030101 | Downloads: 67 | Views: 4896

Author(s)

Zhen Zhang 1

Affiliation(s)

1 Department of Electronic Engineering, Jinan University, Guangzhou 510632, P. R. China

Corresponding Author

Zhen Zhang

ABSTRACT

A novel voltage reference circuit without amplifier is proposed in this paper. In this circuit, the difference between the two NMOS transistors operating in the sub-threshold region is applied to the resistor, thereby generating current with positive temperature coefficient, which is mirrored to the output circuit to generate voltage with positive temperature coefficient. The gate-source voltage of the NMOS operating in the sub-threshold region is added to the voltage with positive temperature coefficient, and finally reference voltage is generated that does not change with temperature, voltage and process. Compared with the traditional voltage reference circuit, the circuit is simplified by using negative feedback structure instead of amplifiers. This design is simulated based on 180 nm process and Cadence simulator. When the power supply voltage (VDD) is between 1.3 V and 2.5 V and the temperature (T) is between -80 °C and 90 °C, in the most ideal case, the temperature coefficient (TC) is 8.6 ppm/°C, the power supply rejection ratio (PSRR) is -32 dB both at 100 Hz and 10 kHz. In the typical VDD of 1.8 V, the reference voltage (VREF) is 684 mV, which can be applied to on-chip digital isolators, transceivers and temperature sensors, etc.

KEYWORDS

voltage reference; sub-threshold; negative feedback; temperature coefficient

CITE THIS PAPER

Zhen Zhang. A novel voltage reference circuit without amplifier. Journal of Electrotechnology, Electrical Engineering and Management (2020) Vol. 3: 1-7. DOI: http://dx.doi.org/10.23977/jeeem.2020.030101.

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