MIXED SIGNAL CIRCUIT DESIGN

PART A  

                              Answer any two full questions, each carries 15 marks. Marks

• a) Derive the voltage gain and output impedance of source follower. (8)       b) Draw and explain folded cascode configuration and list out its advantages.             (7)
• a) Explain the working and derive the output impedance of a simple MOS current (7) mirror.
  1. Derive the output impedance of differential amplifier with MOS current source (8) load.
• a) What is the effect of source degeneration resistor in a common source amplifier? (5)
  1. Derive the output impedance of MOS telescopic cascode differential amplifier. (10)
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PART B  

Answer any two full questions, each carries 15 marks.

• a) What is miller compensation ? How it is  implemented in a 2-stage op-amp?                (10)
  1. Derive the expression for the gain of a 2-stage op-amp. (5)
• a) Quantitatively explain the working of a supply independent reference circuit. (8)       b) Draw the block diagram of a charge pump PLL and explain the functions of each       (7) block.
• a) With neat circuit diagram, explain two stage open loop comparator circuit. (8)       b) What is the principle behind band gap reference in analog integrated circuits?       (7)

PART C  

Answer any two full questions, each carries 20 marks.

• a) Quantitatively explain charge injection and clock-feedthrough in MOS switch. (10) b) Draw the circuit diagram and explain the working of a Switched Capacitor (10) (SC)integrator.

8 a) What are the specifications of a DAC? Explain any four in detail. (10)     b) Draw the circuit diagram of a pipeline ADC and explain its operation. (10) 9 a) With neat diagram,  explain the working of a sample and hold circuit.            (10)     b) Draw the circuit diagram of a R-2R DAC and explain its operation.   (10) ****