DC biasing on Q2N2222

Oct 16, 2006 8 Replies

Hi,



i created a simple circuir with Q2N2222, intended to bias base at 2V. Ie Ic is about 0.5mA.



what I got from simulation is:


**** SMALL SIGNAL BIAS SOLUTION TEMPERATURE = 27.000 DEG C


******************************************************************************


NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE NODE VOLTAGE


( +5v) 752.2E-27 ($N_0001) 731.1E-27 ($N_0002)



755.2E-27

($N_0003)-129.6E-27 ($N_0004) 0.0000


($N_0005) 0.0000 ($N_0006) 0.0000


I guess N_0001 is Vb? how come it is E-27?


thanks



Netlist? Bias base at 2V ?:-) Re-read your textbook ;-)

...Jim Thompson

| James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.

Post a netlist.

...Jim Thompson

| James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.

(1) Your top posting is getting annoying.

(2) You have no power, "+5v" is being interpreted as a NODE name.

(3) V_V2 has all values set to ZERO

(4) It looks like you're using PSpice? I'm surprised it isn't spitting out (up ?:-) an error message.

(5) You are a sad excuse for a student :-(

...Jim Thompson

| James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.

FWIW, your bottom posting isn't wining any friends (here) either. :-)

I post right after the pertinent original material. I enjoy _wining_ and dining with my friends. However I don't care if I'm not _winning_ any friends here ;-)

...Jim Thompson

| James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.

You misspelled it. It should say "I enjoy whining".

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