a) Draw and describe the functional block diagram of IC 555.
b) describe the functioning of 555 in Monostable configuration.
a) describe how astable mode of 555 can be modified to get a square wave generator.
b) Design a 555 based square wave generator to produce a symmetrical square wave of 1 KHz. If VCC = 12V. Draw the voltage across timing capacitor and the output.
a) Describe the 555 timer
i) Monostable multivibrator application in Pulse Width Modulation.
ii) Astable multivibrator application in FSK generator.
b) A 555 timer is configured to run in astable mode with R1 = 20K and R2 = 8K and C = 0.1uf. Determine the output frequency and duty cycle.
a) Design an astable multivibrator using 555 timer to produce a square wave of 2 KHz frequency and 70% duty cycle. Draw the circuit with all component values.
b) describe how a PLL is used as a frequency multiplier.
a) describe the role of the basic building blocks of PLL.
b) Determine the DC control voltage vc at lock if signal frequency fs = 10 KHz, VCO free running frequency is 10.66 KHz and the voltage to frequency transfer coefficient of VCO is 6600 Hz/V.
a) Draw the schematic circuit diagram of the following and describe their working.
i) Analog phase detector.
Derive necessary expressions.
b) What is their role in PLL? describe.
a) Describe how frequency division and multiplication can be achieved using a Phase Locked Loop.
b) Draw the circuit of a PLL AM detector and describe its operation.