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Electronics for Recording
1 - You seek to engineer a data storage system for a neural signal recorder. How big of a disk will you need for recording 1 hour of data if the system has a 12-bit A/D converter, 100 electrodes, and a sampling rate of 24 kHz?
You would also like to transmit this data wirelessly to a base station for storage. How much bandwidth would you need to design into your wireless?
2 - A small rural hospital would like to purchase an electroencephalograph but cannot afford to build a shielded room in which to measure patients' EEGs. A clinical engineer has determined that there can be common-mode noise on their patients with amplitudes as large as 100 mV. What must the minimum common mode rejection ratio (CMRR) of their electroencephalograph be so that an EEG signal of 25 mV amplitude has no more than 1% common-mode noise?
3 -Consider that you are performing a neural recording (EEG or Microelectrode) in two subjects. During your experiments with both subjects you find that your recordings are contaminated with noise. In subject 1, you determine that the noise is coming from the environment and is affecting all of the electrodes. In subject 2, you determine that the noise is coming from the muscles related to eye blinks and only affecting a subset of your electrodes.
Describe two ways that you would engineer your referencing system for minimizing the noise contamination in these two scenarios. What are the strengths and weaknesses of each approach?
Build a series circuit consisting of a 130 V 60 Hz ac source, a 5 ohm resistor, a 53.05 mH inductor, and a 0.33156 mF capacitor. a) Draw the ac circuit diagram b) Sove for the phasor current and phasor voltages across each component.
A certain load takes 10kW at 0.5pf lagging when connected to a 230V, 60Hz source. The supply company charges a penalty when the power factor fall below 0.8. What size of capacitor must be used in order to avoid penalty
A 50 (ohm) lossless transmission line is terminated in a load with impedance Z= (30-j50) ohm. the wavelength is 8cm. Determine: (a) reflection coefficient (solved: 0.1 - j0.56 or 0.56 angle -79.9)
A circular coil of 200 turns of radius a=60mm, total resistance R=2 ohm, and no self inductance is rotated about a vertical diameter with uniform angular velocity =200 rad/s in a horizontal magnetic flux B of 0.25 Tesla.
What is the equivalent admittance of the circuit for Z1 = 12, Z2 = 5 - j7, Z3 = 4 + j36 and Z4 = j10 (all in ohms) Note: Z1 and Z3 are in parallel connected to Z2 + Z4 in series, equal Zt || to Z1||Z3
Assume a binary PCM system in which the system ratio of the bit energy to the one-sided noise density at the receiver input is 10 dB. Assume that the probability of error for any value of the independent variable off the scale can be approximated ..
A transmission line with characteristic impedance Z0= 60 ohms is connected to a load impedance ZL= 40-j20 ohms. The wavelength is 8 cm. A. Calculate the load reflection coefficient. B. Calculate the voltage standing wave ratio C.
(a) a circuit in which one fuse will be damaged and other three not, after making all connections as per you schematic and connecting power supply (b) a circuit in which two fuses will be damaged and other two not,d connecting power supply
Consider a thin ring of radius a with uniform charge density and total charge Q. The ring is cut in half across the diameter and the two halves superimposed to double the effective charge density.
Design the simplest all-NOR circuit that has three inputs, x1, x2, and x3, which produces an outpt value of 1 whenever exactly one or two of the inpuit variables have the value 1; otherwise, the output has to be 0.
An inverting amplifier is configured for a gain of -(6/4) using an opamp that has a 2mV internal offset voltage. (You may consider the opamp ideal otherwise). For what input voltage the output of the amplifier will be zero.
If a third attempt is made within 20 seconds, a waiting period of 20 seconds is required before additional attempts can be made to start the motor. While waiitng to make additional attempts to start the motor.
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