b) For correct operation as an ac amplifier a JFET must be correctly DC biased to establish an appropriate Q-point, i.e a positive voltage Vos between the drain and source terminals and a negative voltage VGs between the gate and drain terminals. Figure 2.1 shows a circuit that can achieve this requirement. Explain the role of each resistive element in this circuit.

1. Given:VS1: -1 voltsVS2: 24 voltsB=beta: 150RE: 330 ohmsRC: 750 ohmsVC: ? volts

18. A dc-dc converter is to be built with the following specifications: Allowed dc input voltage range: +8 V to +18 V +24 V Output average voltage: Output voltage ripple: ±0.06 V maximum at rated load 300 W, resistive ±250 mA maximum at rated load 100 kHz Rated load: Input current ripple: Switching frequency: Common ground between input and output. a. Draw a circuit which can perform this function. b. What is the necessary range of duty ratio for each switch? c. Find circuit part values (R, L, and C) which will meet the stated specifications.