Prelab 6, Exercise 1: DC Biasing *_________________________________________________________________________ * * Supplies *_________________________________________________________________________ * Vcc cc 0 +12 Vee ee 0 -12 *_________________________________________________________________________ * * Differential Pair *_________________________________________________________________________ * R1 cc cQ1 2.7k R2 p1 cQ2 2.2k Rp1 cc p1 733.67 * Uncomment the following two lines if you want to sweep Rp1 *.param res = 733.67 * Rp1 cc p1 res Q1 cQ1 bQ1 cQ4 n3904 Q2 cQ2 bQ2 cQ4 n3904 *_________________________________________________________________________ * * Tail Current Source *_________________________________________________________________________ * Q4 cQ4 d1 eQ4 n3904 R3 eQ4 ee 1.5k *_________________________________________________________________________ * * Common Emitter Second Stage *_________________________________________________________________________ * Q3 out cQ2 cc n3906 Q5 out d1 eQ5 n3904 R4 eQ5 ee 910 *Rl out 0 100k *C4 cQ2 out ??? *_________________________________________________________________________ * * Bias Reference Source *_________________________________________________________________________ * Vd1 d1 ee 1.4 *R5 cc d1 4.7k *D1 d1 d2 n4148 *D2 d2 ee n4148 *_________________________________________________________________________ * * Input Circuit *_________________________________________________________________________ * R6 0 bQ1 47 R7 0 bQ2 47 * Items #3, #4, #5 *Vs ins 0 AC 1 *Rs ins in+ 50 * Items #3, #4 Open Loop Gain & BW *R6 0 bQ1 47 *R7 in+ bQ2 47 * Item #5 AC response with Feedback *R6 in- bQ1 47 *R7 in+ bQ2 47 * Nerd Bonus Common Mode Gain *R6 in+ bQ1 47 *R7 in+ bQ2 47 *_________________________________________________________________________ * * Feedback Loop, item #5 : Set Rg for gains of 1, 10, and 1000 *_________________________________________________________________________ * *Rg in- cc1 ??? *C1 cc1 0 1000uF *Rf in- out 100k *_________________________________________________________________________ * * Device models *_________________________________________________________________________ * .model n4148 d (is=1E-12) .model n3904 npn (Bf=100 Is=0.29E-14 Va=100 Tf=0.6n Cje=4pF Cjc=3.6pF) .model n3906 pnp (Bf= 50 Is=0.29E-14 Va= 50 Tf=0.6n Cje=6pF Cjc=6.7pF) *_________________________________________________________________________ * * Analysis *_________________________________________________________________________ * * Uncomment the following two lines to sweep Rp1 *.DC res 733 734 .01 *.print dc V(out) .op *.AC DEC 10 1 100MEG *.option post .end