Operational Amplifier / Digital to Analog Converter (DAC) Solved Problem | Quiz # 533

In this video, for the given 3-bit DAC, the input impedance seen through the reference voltage source and the total current in the circuit is calculated when the digital input is 110.

Here is the detail of the Quiz.

Question :
A 3-bit DAC is implemented using ideal op-amp and switches as shown in the figure. Each of the switches gets closed when its corresponding digital input is at logic 1. For a digital input of 110, the resistance Rin seen from the reference source and the current 𝑰, are

A) 𝑹_𝒊𝒏=𝟐𝒌Ω and I = 3 mA
B) 𝑹_𝒊𝒏=𝟏𝟐𝒌Ω and I = 0.5 mA
C) 𝑹_𝒊𝒏 =∞ and I = 1 mA
D) 𝑹_𝒊𝒏 =∞ and I = 3mA

Subject: Analog Electronics / Digital Electronics
Topic: Operational Amplifier / Digital to Analog Converter

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