# Category: microelectronics sedra and smith chapter 4

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#### 4.64 Provide two designs of shunt regulators utilizing the 1N5235 zener diode,which is specified as follows: V Z =6.8 V and r z = 5 for I Z = 20 mA; at I Z = 0.25 mA (nearer the knee), r z = 750 . For both designs, the supply voltage is nominally 9 V and varies by ±1 V. For the first design, assume that the availability of supply current is not a problem, and thus operate the diode at 20 mA. For the second design, assume that the current from the raw supply is limited, and therefore you are forced to operate the diode at 0.25 mA. For the purpose of these initial designs, assume no load. For each design find the value of R and the line regulation.

4.64 Provide two designs of shunt regulators utilizing the 1N5235 zener diode,which is specified as follows: V Z =6.8 V ...

#### 4.63 Design a 7.5-V zener regulator circuit using a 7.5-V zener specified at 10 mA. The zener has an incremental resistance r z = 30 and a knee current of 0.5 mA. The regulator operates from a 10-V supply and has a 1.5-k load. What is the value of R you have chosen?What is the regulator output voltage when the supply is 10% high? Is 10% low? What is the output voltage when both the supply is 10% high and the load is removed? What is the smallest possible load resistor that can be used while the zener operates at a current no lower than the knee current while the supply is 10% low? What is the load voltage in this case?

4.63 Design a 7.5-V zener regulator circuit using a 7.5-V zener specified at 10 mA. The zener has an incremental ...

#### 4.62 A9.1-Vzener diode exhibits its nominal voltage at a test current of 20 mA. At this current the incremental resistance is specified as 10 . Find V Z0 of the zener model. Find the zener voltage at a current of 10 mA and at 50 mA.

4.62 A9.1-Vzener diode exhibits its nominal voltage at a test current of 20 mA. At this current the incremental resistance ...