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Hi,
Some elements (short answer !) for core selection :
- is the pcb flexible or rigid ?
- If your circuit must withstand high temperature, you should select high Tg
- if you have high frequency signal, you should care about dielectric loss
- if your environment is chemically aggressive or...
I am not trying to build an opamp, Just a differential pair. What make you saying that bcm847 is not low noise ? Back to my first question : How to compare noise figure to noise density ?
Manufacturer is NXP and references are BCM847/857. Both are matched transistor pair (to replace ssm2xxx wich becomes hard to find)
If you are aware of another low noise bipolar matched pair in production, I would be thankfull if you could ive me some references.
Audioguru :
There are unfortunately no graph for the transistor which has only "noise figure" in its datasheet...
Crutshow
The datasheet specify "noise figure" for given vce and Ic (and of course bandwidth). They also give a "Rs", which looks like a load resistor. I understand that noise figure...
Hi there,
I would like to compare two transistors, to replace a nearly obsolete reference in a design.
The first one (the reference) has a noise density of 1nV/sqrt(Hz). We can consider that the noise density is flat on the usefull bandwith, i.e. 10Hz-> 15kHz (not true, but a worst case).
The...
Hi, with ADE, you can use the calculator (tools->calculator) and add Vgs-Vth as value to save.
Then add gm = ids/vds, also with calculator.
After somulation, in plot window, choose Y vs Y, that's it.
No idea in command line, but feasible, because spice can do it.
Regards
Hi,
This is not skill.
Open the property window of the desired device (key 'q)
Check the box in order to display extended properties
Add/create a new property with name : ntAction value: ignore
As analog engineer, I have been asked to review a design before production. This design include an antenna on the PCB (see attached picture, about 5cm by 5cm), but the antenna design seems very strange to me. This emitter antenna must work in the band of few Hz to few 10 Hz (ELF band). A simple...
Hi,
Just monitor the voltage accros the LED, or more precise, the voltage accross a small shunt resistance in each branch. The voltage will be an image of the current.
You will need a comparator for each led.
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