[sdiy] help interpreting diagrams with Mosfets

[Harry Bissell]

Dan... you can get MOSFETs in discrete packages, such as the 2N7000. I use the VP0808 and the VN1206 when I have
the appetite for MOSFETs...

Most MOSFETs in discrete packages have a parasitic diode intrinsic, or an anti-parallel diode added. Can be a hidden weenie
for some circuits.

Let me know when you have re-created "rap" music using the technology. Shouldn't take more than a few neurons... :^)

H^) harry


----- Original Message -----
From: lanterma at ece.gatech.edu
To: synth-diy at dropmix.xs4all.nl
Sent: Thu, 26 May 2011 02:14:07 -0400 (EDT)
Subject: Re: [sdiy] help interpreting diagrams with Mosfets


On May 25, 2011, at 11:16 PM, dan snazelle wrote:

> http://www.scholarpedia.org/article/Silicon_neurons

...

> 1. can these Mosfets (?) be replaced with CMOS inverters or simply JFETS ?

In general, no... of course if you see a couple of MOSFETS configured as an inverter you can use an inverter, but in general, no.

All CMOS indicates is a MOSFET process that has both nFETs and pFETs. 

They have many similarities to JFETs but you generally can't do a 1-for-1 replacement.

> 2. are they just symbols for amplifiers?

No, no... MOSFETs are their own thing.

ONe word of caution is that the "op amp symbols" here are mostly OTAs. But circuits people often write OTAs using a voltage bias input instead of a current input; there's usually an implicit nFET or something inside there doing a voltage-to-current kind of conversion.

If you want to putter around with MOSFETs a 4007 isn't a bad chip to start with.

- Aaron
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-- 
Harry Bissell & Nora Abdullah 4eva