A diode has forward voltage drop of 1 V when conducting and Qrr = 10 μC . The input voltage is 10sin(100πt). R = 1 Ω. Calculate a) Diode conduction loss (1pt) b) Diode reverse recovery loss (1pt) c) Output power (resistor power) (1pt) d) Efficiency of the system (1pt), and e) Carefully sketch the labelled current iD. (1pt)
Image text
A diode has forward voltage drop of 1 V when conducting and Qrr = 10 μC . The input voltage is 10sin(100πt). R = 1 Ω. Calculate a) Diode conduction loss (1pt) b) Diode reverse recovery loss (1pt) c) Output power (resistor power) (1pt) d) Efficiency of the system (1pt), and e) Carefully sketch the labelled current iD. (1pt)
![Consider the full-wave diode rectifier circuit shown in the figure below. Assuming the input voltage is VAC = 170 sin(120πt) the conduction angle of the diode is 32∘, and the load resistance RL = 500 Ω, and the capacitor CS = 100 μF. We assume that all components are ideal and neglect the voltage drop across the diodes. {For the questions below, please only state the value. No need to include the units in your answers}. (a) Estimate the peak-to-peak ripple voltage in the output voltage VR. [2 marks] (b) The average voltage. [2 marks] (c) The RMS voltage. [2 marks] (d) The form factor. [2 marks] (e) If the ripple voltage across the load resistance RL must not exceed 1 V peak to-peak, calculate the value of smoothing capacitance required. You may assume that the capacitor provides current to the load for each complete cycle of the rectified voltage. [4 marks]](https://www.doubtrix.com/uploads/editor/0294629005gsMjwksRCG.jpg)
![(a) Assume that the MOSFET in Figure 3.1 is operating in saturation and is characterised by a threshold voltage, VT = 1 V. Assume that the parameter, K = 1 mA/V2 where the drain-source current in the MOSFET in saturation is given by the usual expression: iDS = K2(vGS−VT)2 Calculate the output voltage, vo, for the circuit shown in Figure 3.1 when vIN = 2.5 V, Vs = 10 V, and R = 1 kΩ. The correct solution should satisfy both conditions necessary for the device to operate in saturation. Figure 2.1 [10 marks] (b) For the circuit in Figure 2.1, calculate the small signal voltage gain of the circuit, Av, at the operating point defined by the numerical values of part (a). Assume the input and output voltages include small signal components, vin and vout respectively. VIN and Vout correspond to the constant DC components of the input and output voltage from part (a). vIN = VIN +vin vOUT = VOUT +vout Av = vout vin [10 marks] (c) Determine the small signal output impedance at the terminals labelled a and b for the circuit shown in Figure 3.1 and at the operating point defined by the numerical values of part (a). [10 marks]](https://www.doubtrix.com/uploads/editor/3475428305cJOidAHSIp.jpg)