Question

R, Figure P7.49 .50 Figure P7.50 shows a current source realized using a current mirror with two matched transistors Q, and o, . Two equal resistances R, are inserted in the source leads to increase the output resistance of the current source. If Q, is operating at gm 1 mA/V and has VA-= 10 V, and if the maximum allowed de voltage drop across R, is 0.3 V, what is the maximum avail- able output resistance of the current source? Assume that the voltage at the common-gate node is approximately constant. 100 μΑ Rout 0i 0: nA/V and R, mA/V and g a Nortorn d a source oaded in a ere i, is the by a factor Figure P7.50 7.51 In the common-gate amplifier circuit of Fig. P7.51,Q, and Q, are matched. kr(w/L).-弋(wyL, 4 mA/V2, and change? all transistors have |V,I 0.8 V and |V,l 20 V. The signal as a current V is a small sinusoidal signal with no de component. (a) Neglecting the effect of V,, find the de drain current of e in Fig. P7.49, and the required value of VaiAS sistance of 500 (b) Find the values of gni and r, for all transistors. V. Design for (e) Find the value of R, (d) Find the value of R difficult- very challenging, D - design problem

Answer 1

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