Analog Circuit Design Exercises: MOS Transistors, Current Mirrors, Noise, and ADC, Assignments of Digital & Analog Electronics

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Q1: Find the voltage gain at very low and very high frequencies for the

following circuit. Neglect all MOS internal capacitances. λ≠

Q2: Find V b to achieve 1:1 ratio of the current mirror λ = 0 Assuming I REF = 1mA, (W/L)1 = (W/L)2 = 10/0.5, (W/L)3 = 40/0. Assume V thn = 0.4 V, μ n Cox = 200 μA/V 2 , and V DD = 3V. Assume Vds1 = Vds2. Vdd M 1 M 2

M 3

IREF vb

Q

A 12-bit SAR ADC is being used in a digital audio application. The ADC has a full- scale input voltage range of 0-3.3V. The audio signal being sampled has a maximum frequency of 20 kHz. Calculate the minimum sampling rate the ADC must use to accurately digitize the audio signal. Determine the quantization error in volts. If the ADC operates with an SNR of 72 dB, calculate its ENOB.

Q5. 𝑫𝒆𝒔𝒊𝒈𝒏 𝒂 𝒅𝒊𝒇𝒇𝒆𝒓𝒆𝒏𝒕𝒊𝒂𝒍 𝟓𝑻 𝑶𝑻𝑨.

𝐴𝑠𝑠𝑢𝑚𝑒: μ𝑛𝐶𝑜𝑥 = 300μ𝐴 𝑉 2 and μ𝑝𝐶𝑜𝑥 = 60 μ𝐴 𝑉 2 𝑉𝑡ℎ𝑛 = 0 .5𝑉 𝑎𝑛𝑑 𝑉𝑡ℎ𝑝 = − 0 .45𝑉