Question

ONLY NEED HELP WITH III and IV PLEASE

(e) A second stage, shown in Figure 3, is cascaded directly after the output of the circuit in Figure 1 R4 Figure 3 (i) Show that the combined response of the complete circuit is given by: (4 marks) (ii) The two cascaded stages form a bandpass filter, which only amplifies a specific range of frequencies. This range of frequencies is known as the passband. Using the values chosen in (a) for Figure 1 and given that R31kQ, design the new cascaded amplifier to produce a passband gain of 40dB (for combined response) and a cut-off (-3dB) frequency of 100kHz for new cascaded stage (4 marks) Page 2 of 3 (ii) Sketch the new Bode magnitude plot for the combined response of the circuit for the (5 marks) same range of 10o to 1010 Hz. (iv) What is the rms magnitude of the output voltage vx if v, = 102 sin (2m mV when i. f 0.1kHz ii. f 1kHz (6 marks) iii. f=1MHz R2 R1 C1 Figure 1

Answer 1

SC Vi 0 VoCs) ViCs) Sc v. (s Vi (s)

Lose plot Sppe charge/ Pinal S CR2 CR Vo Vi