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Consider the following current mirror combination, where all transistors have the same kn'(W/L) =...

Consider the following current mirror combination, where all transistors have the same kn'(W/L) = kp'(W/L) =

2mA/V2, and VTN = 1V, VTP = -1V. It is also given that VDD1 = 10V, VDD2 = 8V. Remember that for saturation the drain current is given by ID = ½ kn'(W/L) (VGS – VTN)2 for NMOS and ID = ½ kp'(W/L) (VGS – VTP)2 for PMOS. You can ignore the channel modulation for all transistors.

  1. Find the value of R so that Io=1mA.
  2. Are transistors Q1, Q2, Q3 in saturation?
  3. What is the range of Vo so that Q4 is in saturation?
  4.

    Assume that a resistor 1K is connected to the output node (at Vo) as the load (i.e. one terminal of the resistor is connected to the output node, and the other to the ground). Will the particular current mirror support this load?
  5. (e) Assume that a resistor 1K in series to a constant voltage source Vx are connected to the output node (at Vo) as the load (i.e. one terminal of the resistor is connected to the output node and the other to the voltage course. The other voltage source terminal is connected to the ground). What is the allowable voltage range for Vx?

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Answer #1

iven that REF 12 艮 a) Qlh n Scrtavation on ts gate and drain connected as b) -Ave -tioundistovs , , 3 as in Saturation 9 As艮oY . to be in Saturation, V 2 V- V TN 7» Im s also in saturation for to b n tion be tou Conditionmust be nCatur VISd) 1k is connected at o너 Put -Hence dap acyoss nests toy i e vo) outou but fo 14 to be in Satuotion must turti tiods not be S

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