Nov 26, 2006 #1 T tran Member level 4 Joined Jun 11, 2006 Messages 74 Helped 3 Reputation 6 Reaction score 3 Trophy points 1,288 Activity points 1,867 Hi all, Can anybody tell me why we need connect the bulk of NMOS to GND and the bulk of PMOS to VDD? Thanks
Hi all, Can anybody tell me why we need connect the bulk of NMOS to GND and the bulk of PMOS to VDD? Thanks
Nov 26, 2006 #2 safwatonline Advanced Member level 4 Joined Nov 19, 2005 Messages 1,341 Helped 219 Reputation 438 Reaction score 48 Trophy points 1,328 Location EGYPT Activity points 9,038 Bulk connection to insure that the junction between the diffusion and the bulk is reverse bias so that we minimize the current in the vertical direction
Bulk connection to insure that the junction between the diffusion and the bulk is reverse bias so that we minimize the current in the vertical direction
Nov 26, 2006 #3 M m_mosazadeh Member level 4 Joined Apr 25, 2004 Messages 69 Helped 0 Reputation 0 Reaction score 1 Trophy points 1,286 Location iran Activity points 350 Re: Bulk connection because of functionality of transisitor and avoiding of forward biasing in normal operation
Re: Bulk connection because of functionality of transisitor and avoiding of forward biasing in normal operation
Nov 27, 2006 #4 H huojinsi Full Member level 5 Joined Jan 21, 2005 Messages 256 Helped 25 Reputation 50 Reaction score 6 Trophy points 1,298 Activity points 2,216 Re: Bulk connection A simple understanding is that a parasitical diode exists between the bulk of NMOS and PMOS, so in order to insure this parasitical diode is reversed, connect the bulk of NMOS to GND and the bulk of PMOS to VDD. Pls see the below picture!
Re: Bulk connection A simple understanding is that a parasitical diode exists between the bulk of NMOS and PMOS, so in order to insure this parasitical diode is reversed, connect the bulk of NMOS to GND and the bulk of PMOS to VDD. Pls see the below picture!
Nov 27, 2006 #5 qiushidaren Full Member level 2 Joined Mar 21, 2006 Messages 149 Helped 4 Reputation 8 Reaction score 3 Trophy points 1,298 Location BME??BFE Activity points 2,426 Bulk connection Because we don't want the unwanted vertical parasitical diodes to be turned on.
Nov 27, 2006 #6 T tran Member level 4 Joined Jun 11, 2006 Messages 74 Helped 3 Reputation 6 Reaction score 3 Trophy points 1,288 Activity points 1,867 Re: Bulk connection Thank you very much for all answer. Now, I understand this problem.