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COLORADO STATE UNIVERSITY ECE 332: ELECTRONIC PRINCIPLES II HOMEWORK 6 1. Sketch the p-channel counterpart of the current-source circuit in the figure shown below. Note that the circuit should more appropriately be called a current sink, the corresponding PMOS circuit is a current source. Let ππ·π· = 1.8 π, |ππ‘ | = 0.5 π, π1 and π2 be matched, and ππ πΆππ₯ = 100ππ΄/π 2 . Find the device π/πΏ ratios and the value of the resistor that sets the value of πΌπ πΈπΉ so that a nominally 80ππ΄ output current is obtained. The current source is required to operate for ππ as high as 1.6V. Neglect channel-length modulation. 2. For the current-steering circuit shown in the figure below, find πΌπ in terms of πΌπ πΈπΉ and device π/πΏ ratios of four transistors. Page 1 of 2 3. The current-steering circuit shown in the figure below is fabricated in a CMOS technology for which ππ πΆππ₯ = 200ππ΄/π 2 , ππ πΆππ₯ = 80ππ΄/π 2 , ππ‘π = 0.6 π, ππ‘π = β0.6 π, πβ²π΄π = 10 π/ππ, |πβ²π΄π | = 12 π/ππ. If all devices have πΏ = 0.8ππ, design the circuit so that πΌπ πΈπΉ = 20 ππ΄, πΌ2 = 100 ππ΄, πΌ3 = πΌ4 = 20 ππ΄, and πΌ5 = 50 ππ΄. Use the minimum possible device widths needed to achieve proper operation of the current source π2 for voltages at its drain as high as +1.3V and proper operation of the current sink π5 with voltages at its drain as low as 1.3V. Specify the widths of all devices and the value R. Find the output resistance of the current source π2 and the output resistance of the current sink π5 . Page 2 of 2