DC biasing on Q2N2222

P

PZ

Guest
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
 
On 15 Oct 2006 19:23:27 -0700, "PZ" <patrick.zou@gmail.com> wrote:

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
Click to expand...
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.
 
So, what's so wrong here? isn't it true you try to set a base DC
voltage to bias a BJT to certain state?

Jim Thompson wrote:
On 15 Oct 2006 19:23:27 -0700, "PZ" <patrick.zou@gmail.com> wrote:

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.
Click to expand...
 
On 15 Oct 2006 19:36:18 -0700, "PZ" <patrick.zou@gmail.com> wrote:

So, what's so wrong here? isn't it true you try to set a base DC
voltage to bias a BJT to certain state?
Click to expand...
Post a netlist.

Jim Thompson wrote:
On 15 Oct 2006 19:23:27 -0700, "PZ" <patrick.zou@gmail.com> wrote:

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.
Click to expand...

...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.
 
Q_Q1 $N_0002 $N_0001 $N_0003 Q2N2222
R_R2 $N_0001 +5v 33k
R_R4 0 $N_0001 22k
R_R5 0 $N_0003 3.9k
R_R3 $N_0002 +5v 4.7k
R_R6 0 $N_0004 5.6k
C_C1 $N_0005 $N_0001 100u
C_C2 $N_0002 $N_0004 100u
R_R1 $N_0006 $N_0005 5k
V_V2 $N_0006 0 DC 0V AC 0V

Jim Thompson wrote:
On 15 Oct 2006 19:36:18 -0700, "PZ" <patrick.zou@gmail.com> wrote:

So, what's so wrong here? isn't it true you try to set a base DC
voltage to bias a BJT to certain state?

Post a netlist.


Jim Thompson wrote:
On 15 Oct 2006 19:23:27 -0700, "PZ" <patrick.zou@gmail.com> wrote:

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.


...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.
Click to expand...
 
On 15 Oct 2006 19:44:12 -0700, "PZ" <patrick.zou@gmail.com> wrote:

Q_Q1 $N_0002 $N_0001 $N_0003 Q2N2222
R_R2 $N_0001 +5v 33k
R_R4 0 $N_0001 22k
R_R5 0 $N_0003 3.9k
R_R3 $N_0002 +5v 4.7k
R_R6 0 $N_0004 5.6k
C_C1 $N_0005 $N_0001 100u
C_C2 $N_0002 $N_0004 100u
R_R1 $N_0006 $N_0005 5k
V_V2 $N_0006 0 DC 0V AC 0V
Click to expand...
(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 wrote:
On 15 Oct 2006 19:36:18 -0700, "PZ" <patrick.zou@gmail.com> wrote:

So, what's so wrong here? isn't it true you try to set a base DC
voltage to bias a BJT to certain state?

Post a netlist.


Jim Thompson wrote:
On 15 Oct 2006 19:23:27 -0700, "PZ" <patrick.zou@gmail.com> wrote:

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.


...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.
Click to expand...

...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. :)


On Sun, 15 Oct 2006 20:02:05 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote:

On 15 Oct 2006 19:44:12 -0700, "PZ" <patrick.zou@gmail.com> wrote:

Q_Q1 $N_0002 $N_0001 $N_0003 Q2N2222
R_R2 $N_0001 +5v 33k
R_R4 0 $N_0001 22k
R_R5 0 $N_0003 3.9k
R_R3 $N_0002 +5v 4.7k
R_R6 0 $N_0004 5.6k
C_C1 $N_0005 $N_0001 100u
C_C2 $N_0002 $N_0004 100u
R_R1 $N_0006 $N_0005 5k
V_V2 $N_0006 0 DC 0V AC 0V

(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.
Click to expand...
 
On Mon, 16 Oct 2006 12:08:04 GMT, Richard Kanarek
<FirstInitialthenLastName@spamcop.net> wrote:

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

On Sun, 15 Oct 2006 20:02:05 -0700, Jim Thompson
To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote:

On 15 Oct 2006 19:44:12 -0700, "PZ" <patrick.zou@gmail.com> wrote:

Q_Q1 $N_0002 $N_0001 $N_0003 Q2N2222
R_R2 $N_0001 +5v 33k
R_R4 0 $N_0001 22k
R_R5 0 $N_0003 3.9k
R_R3 $N_0002 +5v 4.7k
R_R6 0 $N_0004 5.6k
C_C1 $N_0005 $N_0001 100u
C_C2 $N_0002 $N_0004 100u
R_R1 $N_0006 $N_0005 5k
V_V2 $N_0006 0 DC 0V AC 0V

(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.
Click to expand...

...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.
 
Jim Thompson <To-Email-Use-The-Envelope-Icon@My-Web-Site.com> wrote:

On Mon, 16 Oct 2006 12:08:04 GMT, Richard Kanarek
FirstInitialthenLastName@spamcop.net> wrote:

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

I post right after the pertinent original material. I enjoy _wining_
Click to expand...
You misspelled it. It should say "I enjoy whining".
 
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