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Hi,
The attached image shows the implementation of an FIR filter (taken from "Mixed-Signal and DSP Design Techniques")
The book mentions that this FIR subroutine requires a total of N + 5 cycles for a filter of length N, and uses these numbers to determine how fast the implementation would be...
Thanks for replying FvM!
For these two transistors, we have:
fT Ic output capacitance
BC548 250MHz 500mA 4.5pF
2N3906 250MHz 200mA 4.5pF
Can we have a rough comparison...
Interesting! In this project, you are achieving linearity by firstly putting the output transistor in certain bias point via tying the base to a "positive voltage" and secondly, by further increasing the linearity through a feedback mechanism, right?
Thanks for emphasizing on the difference.
Hi,
While some transistors such as 2N3906 explicitly mention the storage time (225 ns in this case), some others do not. For example, BC548 is a general purpose amplifier and switch but I cannot find the storage time in the datasheet. Is there any way to estimate the storage time of such...
Thanks for your time Brian!
As you mentioned, the mechanism that the book is discussing seems completely different from what 4N35 is pursuing. The books diagrams connect the base terminal to positive voltage which will force the transistor to have a higher current and lower voltage drop but...
Thanks for replying Brian.
Sorry that I didn't completely and clearly explain my question. The schematics are the output device of a type of SSR. Because the book was discussing the switching device, it has omitted the opto-coupler. As explained in my previous post, according to my a-few-hour...
Hi d123,
Thanks for replying.
This was a good direction to follow, thanks!
I searched and found the following App. note:
http://www.soloelectronica.net/PDF/optoacopladores/app2.pdf
Only some of the opto-couplers have a lead for base connection. The above pdf explains that connecting the...
The following document, which is essentially a summary of the handbook that I mentioned, briefly discusses the 3-terminal configuration (the beginning of page 3):
https://www.wolfautomation.com/media/pdf/relays/crouzet/crouzet-introtossr-whitepage.pdf
The diagrams show 'only the output stage' of a relay basically similar to today's technology. The book discusses two different configurations: two terminal connection as shown in the following diagram
and the 3-terminal configuration which was in my previous post. In the 3-terminal...
Thanks for replying Brian!
Then a transistor-based AC SSR must use an MOS and it cannot be a BJT (due to the required symmetry in acting as a switch), am I right?
I have been recently studying "solid state relay handbook with applications". (Unfortunately, I did not find a newer reference to...
Hi,
The switching device of an SSR can be a transistor, an SCR, or a TRIAC. Apparently, a transistor can be used for both AC and DC SSRs. I don't understand how a transistor can both sink and source current in a transistor-based AC SSR?
Thanks in advance!
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