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A sample has a T1 of 0.8 seconds. The net magnetization from the sample set equal to zero and then allowed to recover towards its equilibrium value. After 1.0 seconds, what fraction of the equilibri
Describe the two spin echo methods (1.Hahn, 2. CPMG-Purcell et. al). Describe the role of p/2 and p pulses in each case and make a comparison and contrast. Give diagrams
A hydrogen sample is at equilibrium in a 1.5 Tesla magnetic field. A constant B1 field of 1.17x10-4 Tesla is applied along the +x'-axis for 50 microseconds. What is the direction of the net magnetiz
From the 1H NMR perspective, the human body is composed primarily of fat hydrogens and water hydrogens (H2O). The resonance frequency difference between the NMR signal from these two types of hydrog
the voltage v in a certain circuit is described by the differential equation 3v"+24v'+75V=0 a) determine the values of α and w0 b) what type of damping is exhibited by V(t)
Design a second-order banpass filter with center frequency f=10. The gain should be zero at t=0 and t= 8. Select poles at -a ±j10. Explain the influence of a on the frequency response.
A two stage counter has two input, M and N. (a) Design a counter assuming the outputs come directly from J-K flipflops. (b) Design the counter assuming a two-stage binary counter is used with the J-K
Consider a 1.5 MVA, 4.16 kV, 3φ. 60 Hz synchronous generator. When operating at full load and rated voltage at a power factor of 0.9 lag, WHAT is the stator current in phase b[magnitude & an
An analog repeater section consists of an amplifier with 15 dB noise figure, followed by a coaxial cable with a loss of 40 dB. Show a) the required gain of the amplifier b) The equivalent noise figur
desgin a BJT amplifier that is balanced in while having a single ended output. The differential gain is 20dB= 10 V/V, and CMRR is 40dB = 100 V/V. Beta is 100 and ro = 50kohm. use dual power supplies
A radio receiver has antenna noise temperature of 3000 K and equivalent noise temperature of 7000 K for its feeder and amplifier cascade. It requires Eb/No = 15 dB to provide Probability of error of
Given the following continuous-time system X(t)= [1 0] x(n) + [1]u(t-0.2) [1 1] [0] Determine the pulse-transfer function if a sampling period of Ts = 0.3 is used
To avoid reflections, an X-band waveguide section λg/4 in length is inserted between the two. Assume dominant mode propagation and that the match is at 10 GHz. a) Determine the required wave
A recent study has been carried out concerning radio propagation in railway tunnels. In this study, two railway tunnels of rectangular cross section are considered. Tunnel 1 has transverse dimension
Design an air-filled C-band (5-8 GHz) rectangular waveguide such that the center frequency of this band (f= 6 GHz) is at least 25% higher than the cutoff frequency of the TE10 mode and at least 25%
In addition, the distance between the components of the exciton is always such that there are intervening semiconductor atoms. Thus e in the Bohr formulation must also be replaced by Ks e0, where Ks
In a MOS cascode amplifier, the cascode transistor is required to raise the output resistance by a factor of 40. If the transistor is operated at Vov = 0.2 V, what must its Va be. If the process tec
Are these signals periodic, find their fundamental period T and their fundamental frequency, otherwise prove that they are non-periodic x(t)= 4 cos(12 t+400) + sin(16 t) x(t)=cos4t +3e-j12t x(t)= ej(
Two identical CS amplifiers are connected is cascade. First stage is fed with a source Vsig having a resistance Rsig = 100k Ohm. A load resistance Rl = 10k Ohm is connected to the drain of the secon
Find an application note or data sheet that describes a piece of hardware or software that performs Manchester encoding and decoding. Describe the method used for signal encoding, decoding, and cloc
Look up 8b/10b encoding and explain what purposes (NOTE: purposes is plural!) it serves. How would you implement an 8b/10b encoder
Choose a product or technology that uses base band digital communi- cations and find out what line code it uses. You may not choose RS-232 serial links or similar, or Ethernet because we talked abou
If I want to stream audio data over a digital data link how much channel capacity is required for stereo 16 bit audio sampled at 44kHz. How does this rate compare to common rates for MP3 formatted a
Create a non-inverting op amp circuit to obtain Vout = 12 V if R2 (RF) = 1100k-ohm and Vin =1V . Open up the attributes window of the op amp (click on the op amp symbol) and verify that VPOS = +15V
The probe band limited signal with fmax= 1Mhz was transmitted during the time T0=2 minutes. a) Find the maximum number of samples (N) that can be sent through the channel during T0 without losing of i