Question

By using Table 2, a) Find Ipo, VGG and Vpsdo such that the Q-point is in the middle of the saturation region. b) Find the mid-band voltage gain (vo/Vin) of the FET amplifier. c) Sketch the gain (vo/Vin) in dB versus frequency. Clearly label all break points. Note 1: Please show the solution step by step. Note 2: The values of all results must be four digits after the point. VOD M Vo CL M. Vin 14101 VGG Figure 2. Table 2 21 12 Last Digit of Student No VD (v) CL (PF) VIL (v) -0.4 -0.5 0 175 0.5 VDD (v) 6 8 10 12 2 kni kn2 (HA/V2) (MA/V2) 950 225 1050 275 1150 1250 1 0.6 (v) 0.018 0.016 0.014 0.012 (V) 0.019 0.017 0.015 0.013 4 2 -0.6 0.7 6 3 325 -0.7 0.8 8 4 14 375 1350 -0.8 0.9 0.010 0.011 10

For digit 4

Answer 1

Pao Ans) VOD + ML Vo Ť Cr Mo IC Vin VGG Considering, VoD = 14V; Knj = 375 MA/V2; Kn2 = 1350 mA /v2 VEL=-0.8V; VID = 0.4V ; , = 0.0100;' ^2 = 0.017' GL = 10pF DC Analysis: e voo → are DI + ♡ GI M₂ VDSL Capacitors shorted, Xcoverite Ś source is replaced by its internal resistance. IL → AC Dz, si ID + MD G2 VoSD 52 At the middle of saturation region VDs,= Voo = 16 = 7V VGG TIT TIT VOSL= VoSD = 7V Io = Kn Cvas - V+)*(1+Vos) ( From fig IL= ID) 2

Pg@ from fig, Vasi VG. - VSI = 0 =) Vası = OV VGS2 = VG2 - VS2 = VGG - 07 Vas2 = UGG Kini (Vaisi - Vti) *(1+, Vos.) - į Kina (VGSD - Lute) (it de Voso) | (87521876) 60-6-0,3)”C 1+ Co-010)(7)) 1350x35-6) (VGA-0,91) C1+0.01167 (7) (300) C1.07) = (2389:6) CUGG -0.4)? (VGG - 0.9) >= 0.1343 UGG = 0.3664+ 0.9 AVGG = 102664V (:[0- Kn C Vas - V+)*(1+2 Vos) ; ILIA) Ipsi = Ioso = $(375x10-6) (0.8) ? (..07) 0.1284 x 10-3 Iosu = Ipsp= 0.1284 mA vo ' b Vad + VOL CL in legno Vin Vg50 TUT TT TUT TUTTI .. Above figure in the small signal equivalent circuit: ( Vgsh=0; gm Vgst = 0

Pg® gm. » L. 2 kng IDL = Jac 20375*166) 60-1280x103) - gm L=0.3103m s. 778.816 Ka HOL = X, ID, (CMO) (0.1284x 1037 gmo 2kna IDD = 2C1350810-6) (0.1284x103) gmp = 0.588 ms 708.014ka 21 ~ ropa 72 Ipo Co.ow) C0.1284x10-3) gain is: C, will be opened at mid band and the mid band voltage gain Ve [- gmp ( rooll You)] : V = [-0.588x 10-3 ((708:014) (778-816) ) x 10 Vin 3 (708.014) + (778.816) = [-0.588x10-3 (370.864) x103] mid band voltage gain Vo Vin - 218.068N © C → Cut off frequency fár 275 R Ci where R = (Yoo // YOL) - 370-864 K 2 (708.014 |(778.816) 370.86 ukr

Pg 9 - fel- 2(70) (370.864 x 103) Crox 10'2) "fon = 42914.63 HZ fch 42.91463 KHZ 46.77 dB → la ulind B = 20 log laul = 20 log C218.06) 46.77 dB . Aulin dB + Plot of gain (we don) in de Vo frequency fá NO vin indB 46.77 - 20dB / decade fone 42.91463KHZ (CH²)