Tagged Questions

1
vote
2answers
114 views

Attenuator noise figure and loss

My question is with regard to how attenuators effect noise. From what I understand $$ \text{NF} = 10\log \left( \frac{S_{in}/N_{in}}{S_{out}/N_{out}} \right) = 10\log \left( L \frac{N_{out}}{N_{in}} ...
4
votes
1answer
77 views

How do I connect a signal shield to minimise noise from close proximity AC

In my proposed application, I will have approximately 30 RS-485 nodes configured in 3 chains spaced ~1m apart. There is a need to pass through 240v L-N-E, +5v, A, B, GND in each node. The physical ...
3
votes
3answers
143 views

Is noise a random process?

I have some confusion in noise signals and their nature. Can any one explain how the nature of noise signals is. Is noise a random process.
1
vote
2answers
149 views

How can I add white noise to a low-noise 2 Mhz sine signal from the signal generator?

I want to add a defined level of noise to a low-noise/exact signal generator which produces around 2 Mhz. I heard Zener diodes should be good for that job. But how can I get a defined level of noise ...
1
vote
1answer
132 views

Unexpected pulses in the output signal from IR Detector

I have a Sharp GP1UX311QS IR detector connected to a msp430 launchpad. I wrote a small bit of code to read the output signal from the detector and print the on/off times. However, without emitting any ...
3
votes
3answers
313 views

What do you call the dynamic range of a variable gain amp?

Dynamic range is the ratio of the largest signal a system can process to the noise floor of that system. If the system has variable gain, though, then you could interpret this two ways: Fixed gain ...
0
votes
2answers
191 views

Noisy data line clears up on wiring up multiple output pins of uC to Logic Analyzer

Some people reading my question might be familiar with a string of questions (latest being this one) where I have been asking about how to decode data from an ISM-band ASK/OOK type RF receiver module. ...
3
votes
1answer
70 views

How is Capacity affected by distance?

Shannon's Law says: $$ C = B* log_2 \left( {1+\frac{S}{N}}\right)$$ where C is the information-carrying capacity of the channel, B is the bandwidth, S is the received signal power, and N is the ...