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Type: Posts; User: std_match

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1. ## Thread: How to convert CMRR in DB to Numerical Value

by std_match
Replies
3
Views
269

### Closed: Re: How to convert CMRR in DB to Numerical Value

90 dB = 20 * log(voltage_ratio)
=>
voltage_ratio = 10^(90/20) = 31623

The output will change max 1/31623 of the input common mode change. In this case about 32uV/V

You can also get this...
2. ## Thread: Resistance of component bag made of "reddish" ESD plastic?

by std_match
Replies
17
Views
850

### Closed: Re: Resistance of component bag made of "reddish" ESD plastic?

Watch the ESD bag/mat videos by Dave Jones:

https://www.youtube.com/watch?v=imdtXcnywb8 EEVblog #247 - Anti Static Bag Myth Revisted
3. ## Thread: Error :Syntax error near "module"

by std_match
Replies
13
Views
850

### Closed: Re: Error :Syntax error near "module"

Maybe you told Vivado that it's a VHDL file?

by std_match
Replies
7
Views
554

### [SOLVED]Closed: Re: Adding '1' to a std_logic_vector in VHDL

The TC output is wrong, should be '1' when the counter is "1111" and CET = '1'.
The parallel load is wrong, should happen when PE = '0', regardless of CEP and CET.
An unsigned signal will wrap...

by std_match
Replies
11
Views
678

### Closed: Re: adding reset function to D Flip FLOP

The clock input is inverted on the lower left DFF (DFF3).
Three samples are used, taken with a half clock cycle interval between the samples.
With your numbering, no 2 is the oldest sample, no 3 is...
6. ## Thread: Input impedance of ideal passive mixer

by std_match
Replies
2
Views
388

### Closed: Re: Input impedance of ideal passive mixer

My guess:

The mixer W0 is of the switching/sampling type, which means that the switch in W0 is operated at the LO frequency with a 50% duty cycle.
This means that the current is only 50% of what...

by std_match
Replies
2
Views
437

### Closed: Re: Advice on choosing PCB software

I have friends that work professionally with KiCad. It is easy to try it, since it's open source and free.

If you first learn KiCad, you can then better evaluate the...
8. ## Thread: Laptop RAM upgrade (new RAM doesn't work in RVS slot, but works in STD slot)

by std_match
Replies
11
Views
1,714

### Closed: Re: Laptop RAM upgrade (new RAM doesn't work in RVS slot, but works in STD slot)

I can't explain why the new modules don't work in the RVS slot, but I can explain the STD and RVS markings.

STD = standard, RVS = reverse.
It isn't a position marking in the laptop. It is a...

by std_match
Replies
3
Views
454

### [SOLVED]Closed: Re: Random Led Blinker on DE10-lite FPGA board: [0-7]LED

Every 5 million clock cycles, you invert a random LED.
There is no code to switch off a LED when another turns on.

I think you should post your code in CODE tags instead of attachments.
10. ## Thread: Understanding Skid Buffer Mechanism

by std_match
Replies
18
Views
1,359

### Closed: Re: Understanding Skid Buffer Mechanism

A transaction is completed when valid and ready have been set in the same clock cycle (= both sampled high simultaneously at the positive clock edge at the end of the clock cycle).

With a skid...
11. ## Thread: Understanding Skid Buffer Mechanism

by std_match
Replies
18
Views
1,359

### Closed: Re: Understanding Skid Buffer Mechanism

The timing diagram is wrong. On each interface, a transaction is completed when valid and ready are high in the same clock cycle. In your diagram, this means that d2 is transferred 3 times to the...
12. ## Thread: Laptop RAM upgrade (new RAM doesn't work in RVS slot, but works in STD slot)

by std_match
Replies
11
Views
1,714

### Closed: Re: Laptop RAM upgrade (new RAM doesn't work in RVS slot, but works in STD slot)

It is crazy if such a complicated model number isn't enough to tell if it must be upgraded with DDR3L or DDR4 RAM.
13. ## Thread: Displaying the time parameter using Timer interrupt

by std_match
Replies
4
Views
367

### Closed: Re: Displaying the time parameter using Timer interrupt

In C code, a number beginning with "0" is an octal number. Octal 0123 = Binary 1010011 = Hex 53 = Decimal 83

0129 is illegal because there is no digit '9' in octal base.

Wrong:

...
14. ## Thread: Is such goal achiveable - AVR Soft-Core

by std_match
Replies
3
Views
666

### Closed: Re: Is such goal achiveable - AVR Soft-Core

Don't change the compiler. Write an assembler function that can be called from C-code.
15. ## Thread: Laptop RAM upgrade (new RAM doesn't work in RVS slot, but works in STD slot)

by std_match
Replies
11
Views
1,714

### Closed: Re: Laptop RAM upgrade (new RAM doesn't work in RVS slot, but works in STD slot)

For the combination that "works" with a new DDR4 module, can the computer see the memory? I doubt it.

You should get DDR3L SODIMMs instead.
Your laptop will not take DDR4 modules.
...
16. ## Thread: Is such goal achiveable - AVR Soft-Core

by std_match
Replies
3
Views
666

### Closed: Re: Is such goal achiveable - AVR Soft-Core

It is possible, and maybe useful as a training/learning experience.
Otherwise, I think it is a bad idea. A "simpler" solution is to create a separate "vga terminal/screenbuffer" block and connect it...
17. ## Thread: Understanding Skid Buffer Mechanism

by std_match
Replies
18
Views
1,359

### Closed: Re: Understanding Skid Buffer Mechanism

For timing/speed, you don't want a combinatorial path from destination/output "ready" going back to the source/input "ready".
This means that the "ready" going back to the source/input will be...
18. ## Thread: Ultra low-power timer to make a power saving circuit

by std_match
Replies
24
Views
1,563

### [SOLVED]Closed: Re: Ultra low-power timer to make a power saving circuit

For this application, you should not look at the "active" current for MCU's. Some of them have a low power oscillator that can wake the chip from "sleep" after a certain time. The software can then...

by std_match
Replies
1
Views
914

Sometimes the ad is on both sides and the page works.
Sometimes the ad is in the middle and nothing works. If I reload the page repeatedly, the page will work after a few tries.
20. ## Thread: Issues with driving 16x2 LCD

by std_match
Replies
12
Views
1,050

### Closed: Re: Issues with driving 16x2 LCD

You delay 500 us but only 500 ns is necessary.

You should probably also have the delay after setting LCD_EN = 0
In several places you set LCD_EN = 1 again with no delay.
21. ## Thread: Off-line Power factor correction

by std_match
Replies
13
Views
951

### Closed: Re: Off-line Power factor correction

I agree with Easy peasy.

The transfer function changes between DCM and CCM, so it is much more difficult to make the regulator loop if both modes are allowed.
I think it could be possible with a...
22. ## Thread: Old capacitor needs replacing not sure what to replace with.

by std_match
Replies
17
Views
1,844

### Closed: Re: Old capacitor needs replacing not sure what to replace with.

The small capacitor is 0.005 uF = 5 nF, so 4.7 nF should be a good replacement.

It must be of type "Y" for safety reasons.
23. ## Thread: Linux Command to Copy Multiple Files?

by std_match
Replies
8
Views
3,597

### Closed: Re: Linux Command to Copy Multiple Files?

The file names will be exactly as in the "destination_file_list.txt".

If the file names in the list don't have the .docx extension, you can add it with the "sed" command:

cat...
24. ## Thread: Quartus error 12006 'undefined entity'

by std_match
Replies
6
Views
749

### Closed: Re: Quartus error 12006 'undefined entity'

What device are you using?
Are both clock buffer outputs connected to physical pins on the device?
25. ## Thread: Linux Command to Copy Multiple Files?

by std_match
Replies
8
Views
3,597

### Closed: Re: Linux Command to Copy Multiple Files?

If there is no path in the destination file names, they should go to the current directory.
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