Question

Check point 5: Calculate all voltage drops and currents in this circuit, complete with arrows for current direction and polarity markings for voltage polarity. Then, calculate the overall voltage gain of this amplifier circuit (AV), both as a ratio and as a figure in units of decibels (dB). Find the output voltage and overall voltage gain if R2 changed to 27k12. 22 ko 47 k22 Ri Vout ? Vin = +3.2 volts

Answer 1

Sol: Given circuit: VRY + 22kw VR + 47 kn It I Iz R2 77 R . - Vout? - 3.2V 3.2V TV Vin for a Non-Inverting amplifier : Vout= (1 + R2 ) Vin R 1 > using virtual ground Vp=VC Vin kel Equation at investing amplifier; Vin + Vin-Yout to 476 24K Vout= (1+226) Vin 47K Vout = (1-46) vin Vout = (1046) (3-2) = 4.69 V Ils Vin - 32 = 0.06 476 476 Iz = inou 3.2-4.69 Iz = Vin-Vout 22k -0.06mA. = 22k

Ver = Vin = 3:20 V. - Vor= 3.2-4.6 = -1.4 V Voltage gains It R2 = 1-46 in dB = 20log (1.4+) = 3.287 dB. → Find the output voltage and overall Voltage gain if Ra Changed to 27 km yout = {lt ei ) Vin gains (1 + R2 ) = 1+27% = 1.57 47K in dB = 2010g (1:57) - 3.94dB Igoun= 1:57 (08) 3.94 dB) lp Voltage = (1.50) Vin = 1:57(3-2) = 5.024 Olp Voltage: 5.024V