Determiner rel Rids Acm and CMRR in dB if Ad 100 VV Assume

Determiner r_el, R_ids A_cm, and CMRR in dB if A_d = -100 V/V. Assume beta = 100 and the collector resistances are accurate to within plusminus 1%. (a) r_el (b) R_id = (c) A_cm = (d) CMRR (dB) =

Solution

a) re1 = 10//10

= 5k ohm

b) Rid =150//150 = 75 ohm

c) CMRR = 20 log(Ad/Ac)

V0 = vd*Ad + vc*Ac

Vo = 15/2 = 7.5 V

Ic = 0.001/( 1+ 2/100)

= 0.0098 mA

vc= 5 V

Ac = -50

cmrr = 2