CMOS inverter output to Biopolar

[Pooh Bear]

Pooh Bear 寫�：


remove R2, I got it, thanks.

but it seems that I still have to use more than 500Kohm to get > 3V
swing.

500k *where* ? Which component ?

am I right?

I don't understand why you want a 3V swing to drive a led ! The led goes in
series with the transistor. Are you driving a led or are you doing something else
?

If I use a MOS, it is easy to reach this specification without any
resistor.

am I right?

Why don't you post the schematic with the mosfet ? It might be possible to
understand what you're trying to do then and where your problem arises..

Graham

 

[Boki]

I don't understand why you want a 3V swing to drive a led ! The led goes in
series with the transistor. Are you driving a led or are you doing something else
?

No, just try to understand some limitation.

Why don't you post the schematic with the mosfet ? It might be possible to
understand what you're trying to do then and where your problem arises..

Graham

That's ok, it is a little far to my original question, I can solve it


Thanks.

Best regards,
Boki.

 

[John - KD5YI]

John - KD5YI 寫�：




Hi

http://photos1.blogger.com/blogger/1641/2018/1600/inverter.png

and I get:
http://photos1.blogger.com/blogger/1641/2018/1600/swing.png

Boki.

What is the Vgs threshold voltage of M6? If it is about 2.8V, then your
problem is caused by insufficient supply voltage or by M6 low threshold.

John

 

[John - KD5YI]

What is the Vgs threshold voltage of M6? If it is about 2.8V, then your
problem is caused by insufficient supply voltage or by M6 low threshold.

John

I was looking at your plot incorrectly. My comment is not correct.

John

 

[Ken Taylor]

Just watch out for the bipolar bears. ;-)

How the common is it for a polar bear to be 'bi'?

Ken

 

[Le Chaud Lapin]

which university ... = = ...

University was long ago. I "work" for a living now, thought I would
much rather be doing research in computer networks.

-Le Chaud Lapin-

 

[Michael A. Terrell]

How the common is it for a polar bear to be 'bi'?

Ken

I didn't say Bi-polar bear, I said bipolar bear. You'll have to
ask their doctors how they treat them for their mental problems. ;-)


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida