Temperature Sensor Analog Front-End Based on CFOA

In this paper, a current-mode temperature sensor analog front-end (AFE) using one block is proposed. The proposed temperature sensor AFE is implemented based on the current feedback operational amplifier (CFOA). The CFOA supply voltage is
$\pm 0.6$
V. The CFOA conveys the input current, which is the LED reverse current, with a current offset equal to 3
$\text{nA}$
. The CFOA is loaded with a grounded resistor that provides resistance equal to 250
$\mathrm{k}\Omega$
, and it has been achieved and designed using a pseudo-resistor. The proposed CFOA is examined and tested using LTspice based on 90 nm CMOS technology with a supply voltage of
$\pm 0.6$
V. The circuit provides a gain equal to 250
$\times 10^{3}\mathrm{V}/\mathrm{A}$
. The power consumption of the proposed temperature sensor AFE is 129.03
$\mu \mathrm{W}$
.