Question

transistors, one and L and L 20 μ m, and 40 μ m os current mirror consists of three PMOS e diode connected and two used as current ts. All transistors have lv,1-06 v, k 100 μ A/V" outputsL0μ m but three different widths, namely, 10 μm. m. When the diode-connected transistor is a 100-HA source, how many different output available? Repeat with two of the transistors diode and the third used to provide current output. For le input-diode combination, give the values of the curents are output currents and of the Vso that results

Answer 1

If the transistor with w = 10 mu m is diode connected then I_2 = 100 times 20/10 = 200 mu A I_3 = 100 times 40/10 = 400 mu A If transistor with w = 20 mu m is connected rightarrow I_2 = 100 times 10/20 = 50 mu A I_3 = 100 times 40/20 = 200 mu A If transistor with w = 40 mu m is connected rightarrow I_2 = 100 times 10/40 = 25 mu A I_3 = 100 times 20/40 = 50 mu A if 2 transistors are diode - connected then they act as an equivalent transistor whose width is the sum of the width of each transistor rightarrow If w_eff = 10 + 20 rightarrow I_0 = 100 times 40/30 = 133 mu A if w_eff = 20 + 40 rightarrow I_0 = 100 times 10/60 = 16.7 mu A if w_eff = 40 + 10 rightarrow I_0 = 100 times 20/50 = 40 mu A