5.6 Exercises

Analysis Problems

1. A telephony system has a frequency range from 200 Hz to 3.5 kHz. Determine the minimum acceptable PWM frequency.
2. A background music and paging system has a frequency range from 50 Hz to 10 kHz. Determine the minimum acceptable PWM frequency.
3. Determine the maximum rate of change of input voltage for a driver circuit capable of producing 50 mA with a load consisting of a 1.5 nF gate capacitance.
4. Determine the maximum rate of change of input voltage for a driver circuit capable of producing 60 mA with a load consisting of a 3.5 nF gate capacitance.
5. A power E-MOSFET has an 𝑟_{𝐷𝑆(𝑜𝑛)} of 0.012 Ω and switches a 100 volt source to an 8 Ω load. Determine the maximum load current and 𝑉_𝐷𝑆 .
6. Four power E-MOSFETs drive a 4 Ω load via a full bridge network. If each device has an 𝑟_{𝐷𝑆(𝑜𝑛)} of 0.02 Ω and they switch ± 75 volt sources to the load, determine the load current and 𝑉_𝐷𝑆 of the devices.