Determine the current through the diode, when the switch is in position 1, 2& 3. Assuming op-amps initially nulled.

Question

Determine the current through the diode, when the switch is in position 1, 2& 3. Assuming op-amps initially nulled.

asked Jan 15 in Linear Integrated Circuits by Julian (37.1k points)

Determine the current through the diode, when the switch is in position 1, 2& 3. Assuming op-amps initially nulled.

(a) Io (LED) =4.01mA; Io (Zener) =4.01mA; Io (rectifier) =8.33mA

(b) Io (LED) =25mA; Io (Zener) =4.01mA; Io (rectifier) =4.01mA

(c) Io (LED) =16.67mA; Io (Zener) =16.66mA; Io (rectifier) =4.01mA

(d) Io (LED) =8.33mA; Io (Zener) =8.33mA; Io (rectifier) =8.33mA

The question was asked in an internship interview.

Question is from Voltage to Current Converter with Floating and Grounded Load topic in section Operational Amplifier Applications of Linear Integrated Circuits

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Chris · Answer 1 · 2024-03-16T08:29:13+0000

The accurate choice is (d) Io (LED) =8.33mA; Io (Zener) =8.33mA; Io (rectifier) =8.33mA

Let me simplify it: All the diodes are connected one after another in the feedback path. Therefore, current through the diode remains same. Io =Vin/R1 =1.5/180 =8.33mA.

Determine the current through the diode, when the switch is in position 1, 2& 3. Assuming op-amps initially nulled.

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