Diode connected P-mosfet

[bioroids]

So, if I use a p-mosfet connected as a diode (Gate shorted to Drain), are the anode and cathode inverted respect to the n-mosfet diode?

I don't have some lying around to check, this fact should be interesting to know, and may open possibilities for using 4007 or even inverters as diodes

Greetings!

Miguel

[earthtonesaudio]

So, if I use a p-mosfet connected as a diode (Gate shorted to Drain), are the anode and cathode inverted respect to the n-mosfet diode?

Yep.

You might want to keep in mind that in the 4007 the p-substrates are all tied to V+ and the n-substrates are all tied to ground.  Just something to remember when you're hooking things up.

Not sure how a hex inverter package would work as diodes... coffee hasn't kicked in yet.

[bioroids]

Thanks!

Sadly I was hoping the anode and cathode were the same, because that would have allowed to build a very cool "clipping section" out of a simple inverter (input and output connected together, and using the V+ and Gnd pins as anode and cathode). Now I think it can be done anyway, but the clipping threshold would be around 5v!

I'm not sure how the substrates connection to V+ and Gnd may affect the "diode", but I'm sure gonna check that out when I get my hands on one of those chips

Luck

Miguel

[R.G.]

The old RCA literature on CMOS had schematics of the 4007, showing the internal connections of MOSFETs, diodes, etc.