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Procedures (calculated) V8 = 4.082V (calculated) VE = 3.382 Part 1. Low-Frequency Response Calculations (calculated) Ve= 14V a. Using the specifications data for the transistor record values (calculated) le = 1.537mA (specified) Cbe 10pF (specified) Cbc = 3pF Using the value of le calculate the transistor dynamic resistance. (specified) Coe 8pF Enter values of typical wiring capacitance (calculated) re= 16.916V (approximated) Cw1= 9pF (approximated) Cw0 = 10pF b. Using a characteristics curve tracer, beta measuring instru- ment, or value obtained from previous use in the lab, obtain the value of transistor beta. (Measured) B = 145.7 c. Calculate values of DC bias voltage and current for the circuit of Fig. 4.1
b Measure and record signals for undistorted operation. d. Calculate the magnitude of amplifier midband gain (under (Measured) Vsig = 20mV load) Av, mid = Rc ||RL llre (Measured) V. = 1.4V Av.mid = 83.149 e. Calculate lower cutoff frequencies due to coupling capacitors and due to bypass capacity. (calculated) fl.1=8.47Hz (calculated) fL.2 = 26.1Hz (calculated) fue = 104.5Hz Part 2. Low Frequency Response Measurements Construct the network of Fig. 41. Record actual resistor values in space provided in Fig. 4.1. if desired. Adjust Vcc= 20 V. Apply an input AC signal, Vsig = 20 mV, peak at a frequency of t= 5 kHz. Observe the output voltage using a scope. If V. shows dis- tortion, reduce Vsig until the output is undistorted.
Calculate the circuit's mid-frequency voltage gain. TABLE 4.1- low frequency response f 50-Hz 100-Hz 200Hz 400Hz 600Hz 800Hz 1-kHz 2-kHz Av.mid = 83.33 V Part 3. High Frequency Response Calculations 3-kHz 5-kHz 10-kHz a. Using the equations provided in the Resume of Theory cal- culate upper cutoff frequencies and record below. Vo (Calculated) fh1 = Hz (Calculated) fHoa Hz b. Applying an input which provides non-distorted output volt- age complete Table 4.3 measuring the resulting output volt- age over a range of high frequency values. Calculate the amplifier voltage gain for each frequency and complete (measured) Vi= 4.0448 V
Table 4.2. f 900kHz 1-MHz 2-MHZ TABLE 4.2 V. f 50-Hz 100-Hz 200Hz 400Hz 600Hz 800Hz 1-kHz 2-kHz Av Calculate the amplifier voltage gain (in dB units) and complete Table 4.4 f 3-kHz 5-kHz 10-kHz Av TABLE 4.3 f 10kHz 50kHz 100kHz 300kHz 500kHz 600kHz 700kHz Vo
Table 4.4 f 10kHz 50kHz 100kHz 300kHz 500kHz 600kHz 700kHz dB f 900kHz 1-MHz 2-MHZ dB