Fig. 7
From: A current-mode system to self-measure temperature on implantable optoelectronics
Block diagram of (a) the developed sensor interface connected to LED in H-bridge structure. The SF, SR and ST switches are controlled to have the LED in forward bias (ON), reverse bias (OFF) and temperature sensing, respectively. b Equivalent circuit of CCII consisting of a voltage buffer and a current-controlled current source; the circuit diagram of the sensor interface including, c biasing circuit; d CCII; and e TIA