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A CMOS output driver circuit on an IC is connected to an external transmission line. The NMOS and PMOS transistors have gate oxide thickness d = 2.0 nm and channel length L = 0.25 mum. The power rail is VDO = 1.0 V. The widths wn and wp of the NMOS and PMOS, respectively, are discussed below. Assume the transistors obey the ideal MOSFET equations. For NMOS1 and PMOS1 the threshold voltages are VT= +/- 0.3 V, respectively. The effective mobilities are mun = 250 cm2/Vs and mu P = 125 cm2/Vs, respectively. The transmission line has characteristic impedance Zo = 50 ohms and is 10 cm long. The far end is terminated with resistance RL = 50 Ohms. The transmission line has capacitance per unit length C = 100 pF/m. The end of the load resistor is held not at ground but at a DC value of VDD/2 = 0.5 V. The inputs A and B to NMOS1 and PMOS1 can be controlled separately. Explain what logic level should be applied to A and B to force the output node Vout: into a "high-Z" state where the transistors neither drive nor significantly load the transmission line. The specification on the output driver is that the output voltage should be within 0.1 V of the rails when the output logic level is high or low. What is the minimum corresponding current that the driver must be able to source and sink? Assume wn = 10 mum and wp = 20mum. Calculate the maximum lDsat for NMOS1 and PMOS1 given the rails of 0 and VDO. Sketch the l-V curves 1Dn and lDP for the two transistors vs. the output voltage Vout, for the cases A = B = 0 and A = B = VDD. Show the corresponding lDsat values and the current level you found in part
(b) above. Calculate the minimum required widths of the transistors wn and wp in order to ensure that the output voltage Vout swings to within +/- 0.1 V of the power rails when the A & B are simultaneously driven to 0 or VDO- Find the required widths to +/- 10% accuracy. (To simplify the calculations, you can approximate the transistors as appropriately-valued resistors when Vout is near the power rails.)
The voltage and current at the terminals of the circuit element are zero for t 0 they are v = 90-90e^(-1000t) V i = 50e^(-1000t) mA A) Find the maximum value of the power delivered to the circuit B)
Line A extends from (2,2, 0) to (-2, 2, 0) and Line B extends from (2, -2, 0) to (-2, -2, 0). Each has a linear charge density l = 1 nC / m. You want to calculate the magnitude and direction of the electric field due to the two line charges for al..
What kind of transistor has higher voltage gain, BJT or FET and why What kind of transistor has better noise response BJT or FET and why How about frequency response high frequency, FET or BJT Low frequency response, FET or BJT
A current source of 12 cos 2000t A, a 200-ohm resistor, and a 0.2-H inductor are in parallel. Assume steady-state conditions exist. At t = 1 ms, find the power being absorbed by the (a) resistor; (b) inductor; (c) sinusoidal source.
A sample of radiocactive material undergoes decay such that the number of atoms N(t) remaining in the unstable state at time t is related to the number No at t = 0 by the relation N(t) = No exp(t\tau)
Design an interface for a ±24 V, 500 mA geared DC motor. The time constant of the motor is 10 ms. Include software to adjust the delivered power from 0 to 100%.
An adiabatic piston cylinder contains 1 kg of R-134a. Initially the conditions inside the piston are 200 kPa and 0 degrees C. An electric heater inside the device runs with constant voltage of 110 V and a constant 0.1A of current for one hour
A certain 11 V dry-cell battery, completely discharged, requires a current of 100 mA for 1.2 hr to completely recharge. What is the energy storage capacity of the battery, assuming the voltage does not depend on its charge status?
average velocity of v meters/second. If the concentration of free electrons is 10^{29} electrons per cubic meter and if they are uniformly dispersed throughout the wire, then what is the average velocity of an electron
Digitizing an Audio Signal, PAM, ADC, An audio signal has a bandwidth that extends from 100 Hz to 10 kHz. The signal is sampled to create a PAM signal and then digitized by an analog to digital converter (ADC) that has 8 bits.
Which one of the following statements is correct?
A square wave has a max value of 22 volts, a min value of -46 volts, and a frequency of 44 Hz. Note that it is not centered around the t-axis. what is its rms voltage?
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