Question

Power supply voltage for the photodiode	Resistor value (Vsensor) = 120 V	Output voltages over black (Vsensor)	Output voltage over white (Vsensor)
1 V	3 KΩ	33 mV	120 mV

b. Amplifier subcircuit. Vsensor has to be amplified to obtain the specified sensor output of 3.3 V when the photodiode is over the white background. Calculate the gain required to achieve this. Explain whether this requires an inverting or non-inverting amplifier. Calculate the resistor values to achieve this gain. Explain your working.

Complete the following table.

Table 3 Required amplifier, gain and resistance

Inverting or non-inverting amplifier	Required amplifier gain	Resistor values to achieve this gain

Answer 1