>-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] On Behalf Of tastingfan >tastingfan >Sent: Thursday, August 11, 2005 4:10 PM >To: [email protected] >Subject: [PEDA] simulation of an Open Drain > > >Hi, > > > >I want to simulate an Open Drain circuit (N channel). The >parameters are following > > > >1, Gate: input (impulses): 0-3.3V > >2, Drain connected with a pull-up of 4.7K to 5V > >3, Source connected with GND. > > > >But the output range is 4.891-5V, not 0V-5V. Why? > > > >Best Regards > >Tasting_fan
The voltage swing will depend on what the channel resistance of the FET is. Make sure that the 3.3V pulse is above the threshold voltage of the device, and that the pulse width is larger than 5 RC time constants (the gate has capacitance + resistance and the source will have resistance). Make sure the substrate is connected to GND also. This seems very similar to another question that you've asked in this forum before. Regards, Bevan ____________________________________________________________ You are subscribed to the PEDA discussion forum To Post messages: mailto:[email protected] Unsubscribe and Other Options: http://techservinc.com/mailman/listinfo/peda_techservinc.com Browse or Search Old Archives (2001-2004): http://www.mail-archive.com/[email protected] Browse or Search Current Archives (2004-Current): http://www.mail-archive.com/[email protected]
