Question

A diode circuit shown below is to be used as switching circuit. The output of the circuit is read as logic high or logic low. Let the reference voltage is 1.1 V. If $V_{out}$ is above this reference voltage, the output is logic high else output is logic low.

Taking the cut in voltage of each diode to be 0.7 V, then the minimum value of input voltage for which the output will be logic high is ____ V.

• A. 0.4

Answer 1

The correct option is A 0.4
$V_0=V_{in}+V_{D1}$

$1.1=V_{in}+0.7$

$V_{in}=0.4V$