EE2B1 Revision Points What should you be expected to do in a typical exam question ? Understanding of basic principles. Ability to perform simple circuit.

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EE2B1 Revision Points What should you be expected to do in a typical exam question ? Understanding of basic principles. Ability to perform simple circuit analysis and/or design. Applying skills to unfamiliar problems.

Content Operational Amplifiers Non-ideal behaviour Slew rate, Bandwidth, Input/Output Impedance etc. Non-linear applications Comparator, Schmitt Trigger, Precision Rectifier Transistor Amplifiers Design/Analysis of: Common-emitter amplifier Differential amplifier Basics of multi-stage amplifiers

Past papers EE2B1 papers from 2002 onwards Pre-2002, very different syllabus. Much of 2B1 material used to be covered in 1 st year Small format change from 2003 onwards: 2002: Four compulsory questions 2003 onwards: Six questions, of which four must be answered (two from each section)

Typical Exam Question Figure 1. (a)The circuit in figure 1 shows an inverting Schmitt trigger using power supplies of ±5 V. i.Estimate the magnitude of the saturation levels of the op-amp. ii.Calculate the value of the resistor, R1, in order to give switching thresholds of ±2 V.

i.Estimate the magnitude of the saturation levels of the op-amp. ii.Calculate the value of the resistor, R1, in order to give switching thresholds of ±2 V.

(b)The circuit in figure 2 shows a precision rectifier using ±5 V power supplies again. The slew rate of the op-amp is 0.5 V/µs Sketch the expected waveforms for the op-amp output (V OUT ) and the load voltage (V L ) for: i.V IN is a square wave of 1V pk-pk amplitude and a frequency of 50 Hz. ii.V IN is a square wave of 1V pk-pk amplitude and a frequency of 5 kHz. Figure 2.

SR = 0.5 V/µs i.V IN is a square wave of 1V pk-pk amplitude and a frequency of 50 Hz. ii.V IN is a square wave of 1V pk-pk amplitude and a frequency of 5 kHz.

(c) Design a differential amplifier circuit using transistors with a current gain of 200 to the following specification: Input impedance = 10 kΩ Voltage gain = 50 Power supplies = ±12V and 0V Use a single resistor to bias the differential pair. What is the maximum output voltage swing your design can produce?