A 0.6V, 13nW, 0.0012%/V Line Sensitivity PVT - Invariant Voltage Reference Without Using Resistors and Amplifiers

This paper presents a low-voltage, low-power PVT-invariant voltage reference with excellent line sensitivity for IoT and biomedical applications. By applying a bias current
$(I_{bias})$
in an NMOS-based composite pair and bias voltage
$(V_{bias})$
at the body of NMOS to get the temperature-compensated voltage reference over a wide temperature range. The proposed design implemented in a 180nm CMOS process gives an output of 141mV which is independent of process, voltage, and temperature. Without trimming, the process variation of the proposed design is 0.988%
$(\sigma \mu)$
, and the temperature coefficient of the proposed voltage reference is
$23\text{ppm}/\circ \mathrm{c}$
over a wide temperature range of
$-40^{o}\mathrm{C}$
to
$100^{o}\mathrm{C}$
. For a supply voltage ranging from 0.6V
$-2.1\mathbf{V}$
the line sensitivity of the reference is 0.0012%N. The simulated results show that the proposed voltage reference could operate on a minimum supply of 0.
$6\mathrm{V}$
. and the power supply rejection ratio at 1-Hz is -85dB. The area occupied by the total circuit is
$0.0085\text{mm}^{2}$
, while the total power consumption of the design is 13n W at the typical corner of
$27^{o}\mathrm{C}$
and 0.6V supply.