Q1. (a) Explain briefly using figure(s) as necessary, what is meant by the term hysteresis (5 marks). Provide an example situation where it is beneficially used (5 marks). (b) (i) For the Schmitt trigger circuit shown in Figure Q1, the positive and negative supply voltages are +15V and -15V respectively, and VRef +6V. Find (1) the upper and lower trigger levels for the circuit (20 +20 marks), and (2) the amount of its hysteresis (10 marks). (ii) Sketch neatly and clearly the Vout versus Vin transfer characteristics for the above, marking all key values and providing all necessary labels. (20 marks) (10) (50) (20) (iii) Draw the output waveform that would result when the input is a 10V peak sine-wave. (20) (20 marks) Vin |Vcc+ 15 V Vout -15 V R2 = 10kQ R1 = 5k2 VRef 6 V Figure Q1