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
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
*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
Datasheets for 2n2222/2n2222a report Ft of 250Mhz or 300Mhz.
Could there be something else, messing with your measurements?
Could there be something else, messing with your measurements?
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?
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?
In the real life measurements, I got 44dB gain ant 560Hz high pass too
but the low pass was at 570kHz
No, the AC input was at somethink like 10mV. With 1V input the output is clipping
but the low pass was at 570kHz
No, the AC input was at somethink like 10mV. With 1V input the output is clipping
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"
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"
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