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Old 16th February 2007, 09:56 AM   #1
lineup is offline lineup  Sweden
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Smile Amplifier NPN+PNP Transistors Tester Circuit

hi

Amplifer NPN+PNP Transistors Tester Circuit

When we build our transistor amplifiers, we very often want to use
Complementary NPN + PNP Transistor pairs.
As close matched as possible.

My circuit for this, you can see in Attachment.

A similar circuit should be possible to build.
This one I use for for testing my MultiSim spice models.
--------------------------


About the schematic:
--------------------------------------
This test shows BD139 / BD140 Testing.
I use 10 Volt C-E. But can be changed, of course.
Also the test CURRENT can be easily changed.
In this case I use 10mA for BD139/140.

- Q1 is transistor under test
- CCS 'I2' 2.11uA, is a compensation for base current in U2.
- CCS 'I3' is where I set test current
- V+ is 10.621V, as 0.621V is compensation for VBE of U2
- The negative PNP side is a mirror of NPN test side

======================================

About my actual test result in the attached picture:
- VBE 0.667 and 0.653 Volt is alright
- Base currents: 77.7uA and 31.7uA is not alright

Because a gain difference hfe=128 and hfe=315 is too much.
So I should not use this pair for any Simulations!
I better try to find a some better matched BD139/BD140 spice models.


Finally .................................................. ....................
If you setup such a tester circuit, REAL or in your SIM, you may be very surprised!
Models of NPN+PNP that you have used may turn out to be less good .....
I really recommend you run this test, before you start designing Solid State Amplifiers.



Regards, lineup
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File Type: png npn-pnp-tester1.png (23.8 KB, 593 views)
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Old 18th February 2007, 11:21 AM   #2
lineup is offline lineup  Sweden
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Cool Complementary MOSFET Spice Model Tester

And here is a useful
N-MOS + P-MOS Tester
To checkout that your Spice Models are somewhat correct.

My attachment Tester circuit
shows a test of IRF540N and IRF9540N.
At 1 Ampere and 10 Volt result is:
IRF540 VGS: +3.85V
IRF9540 VGS: -4.34V

Comparing this to figures in datasheet for these MOSFETs
shows that these both models are good!


Regards
lineup
Lineup Audio Lab
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File Type: png mosfet-tester_1.png (8.8 KB, 415 views)
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Old 28th February 2013, 06:51 AM   #3
Sunami is offline Sunami  Indonesia
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Thank you for shearing your Mosfet Tester Circuit to this forum.

I already build your Mosfer Tester to test my old Literal Power Mosfet
Hitachi 2SK134 and Hitachi 2SJ49.

However, not more than 2 minutes test both transistor BC550C and BC560C dead
maybe overload or something I do not know.

Please advice how long I should test for Each Mosfet or you have other tips to modified
the Tester.

Your kind attention and advice it highly appreciated.

Regard,
Sunami
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Old 1st March 2013, 03:10 PM   #4
Sunami is offline Sunami  Indonesia
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Subject : Complementary MOSFET Spice Model Tester

OK, what about R1 change to 220 Ohm and R4 change to 470 ohm.

Any advice...?

Thank you
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Old 1st March 2013, 03:17 PM   #5
FdW is offline FdW  Netherlands
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Would it be doable (too build a testing-circuit and then) to use a difference (instrumentation) amp and subtract the measurement and see (for matching) to get as near as possible to no difference?
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