2N2222 Spice model?

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
I'm looking for an accurate model for this transistor.

The one I have with simetrix doesn't behave like the real one I used :(
With real life measurements, I got a -3dB at 600kHz, with the simulation it's at 160Mhz. Quite a difference!


Does anyone have another model that this one?

.model Q2N2222 npn ( IS=2.48E-13 VAF=73.9 BF=400 IKF=0.1962 NE=1.2069
+ ISE=3.696E-14 IKR=0.02 ISC=5.00E-09 NC=2 NR=1 BR=5 RC=0.3 CJC=7.00E-12
+ FC=0.5 MJC=0.5 VJC=0.5 CJE=1.80E-11 MJE=0.5 VJE=1 TF=4.00E-10
+ ITF=2 VTF=10 XTF=10 RE=0.4 TR=4.00E-08)


Thank you
 
ZETEX Version

*ZETEX 2N2222A Spice model Last revision 9/12/92
*
.MODEL Q2N2222A/ZTX NPN IS =3.0611E-14 NF =1.00124 BF =220 IKF=0.52
+ VAF=104 ISE=7.5E-15 NE =1.41 NR =1.005 BR =4 IKR=0.24
+ VAR=28 ISC=1.06525E-11 NC =1.3728 RB =0.13 RE =0.22
+ RC =0.12 CJC=9.12E-12 MJC=0.3508 VJC=0.4089
+ CJE=27.01E-12 TF =0.325E-9 TR =100E-9
 
Here it is

The -3dB point from the maximum gain, in an AC analysis.
 

Attachments

  • tp.jpg
    tp.jpg
    13.9 KB · Views: 308
Given your circuit and the Zetex model,
yes i see -3dB low pass at 4.1Mhz
I also see -3dB high pass at 550Hz
Max Gain more than 44dB (160+)
Your source is set at 1V.
Is this what you intend to do?
Did you look at the signal at the output?
Did you use identical conditions in the real circuit as well?
 
f_3dB of the transistor's current gain should aprox = f_t/h_fe

also consider miller effect when the gain is high - lower the source resistance for higher bandwidth - to the limit above

the f_3dB in this circuit is sensitive to several stongly varaiable transistor properties and >4x variation wouldn't be unexpected

a 160 MHz f_3dB must be a mistaken sim

Spice .AC analysis linearizes the circuit about the operating point and plots the small signal linear response, the source voltage/current levels are irrelevant and has lead many to declare a hopelessly cilpped, poorly biased cirucit to "work"
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.