# Search:

Type: Posts; User: std_match

Page 1 of 20 1

1. ## Thread: resistor mismatch and the resolution

by std_match
Replies
1
Views
149

### Closed: Re: resistor mismatch and the resolution

Weight of highest bit = 512
Weight of lowest bit = 1

Error in highest bit that corresponds to the weight of the lowest bit = 1/512 = 1/(2^9)
2. ## Thread: Extracting energy from gyroscope precession

by std_match
Replies
42
Views
1,118

### Closed: Re: Extracting energy from gyroscope precession

The "reaction" force is perpendicular to the movement, so no work is done. However, your arms apply a horisontal force, and there is a horisontal movement (the one that creates the reaction force),...
3. ## Thread: Extracting energy from gyroscope precession

by std_match
Replies
42
Views
1,118

### Closed: Re: Extracting energy from gyroscope precession

A swing can be started without friction.
We can move some part of the mass off-center (some other part will go off-center in the other direction).
If we then move this mass up/down with correct...
4. ## Thread: Extracting energy from gyroscope precession

by std_match
Replies
42
Views
1,118

### Closed: Re: Extracting energy from gyroscope precession

The movement is never perpendicular to the external force.
5. ## Thread: Need help creating Vivado Timing Constraint

by std_match
Replies
6
Views
170

### [SOLVED]Closed: Re: Need help creating Vivado Timing Constraint

Without "-hier" you must match the whole path, and the '*' doesn't match the hierarchy separator '/'.
I also think that you don't need the "-from" part if the "-to" part only matches your...
6. ## Thread: Need help creating Vivado Timing Constraint

by std_match
Replies
6
Views
170

### [SOLVED]Closed: Re: Need help creating Vivado Timing Constraint

Try:

set_false_path -to [get_pins -hier sig_b_int_reg[0][0]/D]

The name after "-hier" should be written so it hits the register with the asyncronous input in all syncronizers, which means...
7. ## Thread: Extracting energy from gyroscope precession

by std_match
Replies
42
Views
1,118

### Closed: Re: Extracting energy from gyroscope precession

A force is always needed to change the spinning plane of a gyro. During that change a perpendicular force is created (the one that tries to tilt the axis from the horisontal position). If you allow...
8. ## Thread: Extracting energy from gyroscope precession

by std_match
Replies
42
Views
1,118

### Closed: Re: Extracting energy from gyroscope precession

The force that drives the precession rotation comes from the downward movement of the "free" end of the gyro.
This means that any energy that is extracted comes from the loss of potential energy for...
9. ## Thread: TCM3105 modem modes please explain

by std_match
Replies
2
Views
1,117

### Closed: Re: TCM3105 modem modes please explain

1. It could work if you have perfect matching to the telephone lines in both ends, so nothing of the transmitted signal is reflected back to it's own receiver.
I reality, the receiver will receive...
10. ## Thread: To which standards must we conform for our electronics/electrical product?

by std_match
Replies
4
Views
340

### Closed: Re: To which standards must we conform for our electronics/electrical product?

Start a discussion with a certified EMC lab. They should be able to tell you what EMC-related standards you should follow for different markets.
Hopefully they can also give information, or at least...
11. ## Thread: Using calculated CRC as seed for the next CRC calculation

by std_match
Replies
4
Views
277

### Closed: Re: Using calculated CRC as seed for the next CRC calculation

You should just feed more data into the crc module.
Apply the new data and crc_en='1' for one clock cycle.

Do you really need to process 256 input bits per clock cycle?
You will get the same...
12. ## Thread: Implementation of a MUX for selecting from 2 different sets of inputs

by std_match
Replies
5
Views
258

### Closed: Re: Implementation of a MUX for selecting from 2 different sets of inputs

At the lowest level there will be one MUX per output bit, so there is not much to optimize.
13. ## Thread: Unable to run the simulation correctly ( Modelsim )

by std_match
Replies
2
Views
162

### Closed: Re: Unable to run the simulation correctly ( Modelsim )

In pulse_detector, you assign values to event_pcounter in two different always blocks. When they assign different values you get the 'x' in simulation.
Only assign from one always block.
14. ## Thread: pcie hard ip altera- latency problem

by std_match
Replies
3
Views
391

### Closed: Re: pcie hard ip altera- latency problem

The latency can vary a lot in the real world, and it seems normal in your case. I think your state machine should be able to handle latencies up to about 10 us.
15. ## Thread: Switching regulator peak current

by std_match
Replies
24
Views
1,167

### Closed: Re: Switching regulator peak current

Don't use % values.

Eq 1 D = 1 - (8 * 0.7 / 25) = 0.776
Eq 2 ΔIL = (8 * 0.776) / (1.2M * 6.8u) = 0.76A
Eq 3 Imax-out = (4 - 0.76/2) * (1 - 0.776) = 0.81A
16. ## Thread: Verifying Large ASIC

by std_match
Replies
6
Views
604

### Closed: Re: Verifying Large ASIC

The top level test bench should focus on connectivity. All wires/signals between the modules must be verified, but the possible values/combinations are too many to be tested.
Make sure that you can...
17. ## Thread: HP 54520A Blown Fuse Problem

by std_match
Replies
32
Views
1,576

### Closed: Re: HP 54520A Blown Fuse Problem

Try to connect an old-fashioned light bulb instead of the fuse. If you are lucky the light bulb will stay off until the problem happens, and it will turn on when the fuse normally blows.
If it stays...
18. ## Thread: bjt safe operating area diagram

by std_match
Replies
2
Views
234

### [SOLVED]Closed: Re: bjt safe operating area diagram

It is a typo. The upper one should be 1.0
19. ## Thread: Lattice FPGAs and Diamond software

by std_match
Replies
5
Views
592

### Closed: Re: Lattice FPGAs and Diamond software

THe ECP5 family can be clocked above 200 MHz for the logic.
For the I/O you can have at least 400 MHz DDR = 800 Mbit/s per pin.

The Diamond software is not as good as what Xilinx and Altera have....
20. ## Thread: P mosfet turns on/voltage at drain during powerup

by std_match
Replies
5
Views
426

### Closed: Re: P mosfet turns on/voltage at drain during powerup

Remove C139. You should not have a capacitor between gate and drain.
When you press the button, C136 and C139 form a capacitive voltage divider that will switch on the MOSFET for a while.
If you...
21. ## Thread: Center tapped transformer (forward converter)

by std_match
Replies
18
Views
936

### Closed: Re: Center tapped transformer (forward converter)

Do you have any load on the +12V output?
With no load, overshoots and ringings can be rectified by the diode and increase the output voltage.
22. ## Thread: N7j3a marking transistor

by std_match
Replies
6
Views
871

### Closed: Re: N7j3a marking transistor

It is a normal bipolar PNP transistor. BC847 will not work since it is NPN. Try BC857 or BC807.
23. ## Thread: HP 54520A Blown Fuse Problem

by std_match
Replies
32
Views
1,576

### Closed: Re: HP 54520A Blown Fuse Problem

Measure the voltages over C22 and C23 before the problem happens. The center voltage should be stable and half of +V.
If the leakage is too high, the center voltage can slowly drift away and cause...
24. ## Thread: N7j3a marking transistor

by std_match
Replies
6
Views
871

### Closed: Re: N7j3a marking transistor

It isn't a MOSFET because the gate-source voltage would be 24V.
It seems to be a bipolar PNP transistor, maybe a Darlington (depends on how much current the relay needs).
2N2222 is NPN, so it will...
25. ## Thread: Error in Parity bits of Hamming Code

by std_match
Replies
19
Views
793

### Closed: Re: Error in Parity bits of Hamming Code

It is hard to understand what you want.
A Hamming Code makes no difference between data bits and parity bits regarding error correction. It will correct any single bit error and detect any double...
Results 1 to 25 of 500
Page 1 of 20 1