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Old 11th November 2008, 03:12 AM   #21
andy_c is offline andy_c  United States
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Quote:
Originally posted by lineup
I have not seen any diode into base of any vas transistor of aksa
Sorry for not being clear about that. I was referring to the schematic of the 1999 Halcro patent.
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Old 11th November 2008, 03:56 AM   #22
GK is offline GK  Australia
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Quote:
Originally posted by andy_c


This trick seems to be specific to his particular design though. The CE transistor of his VAS has a diode in series with its base. So the idea was apparently to match the Vcb of the two transistors in the mirror, given that odd VAS configuration (VAS diode seeing base current of VAS CE stage, mirror diode seeing base current of mirror stage).

Hi Andy.

Thanks for the clarification

Cheers,
Glen
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Old 11th November 2008, 11:21 AM   #23
jam is offline jam  United States
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Glen and Andy,

Would you care to comment on the Wilson Mirror and compare it to the Widlar?

Jam
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Old 11th November 2008, 11:31 AM   #24
PMA is offline PMA  Europe
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The best one:
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Old 11th November 2008, 11:38 AM   #25
jam is offline jam  United States
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PMA,

Is that some form of cascoded Widlar mirror?

Jam
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Old 11th November 2008, 11:43 AM   #26
lineup is offline lineup  Sweden
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i see 4 mosfets
i am 99% sure it is a very good mirror

But there are many different mosfet.
Are you using IRF610 = TO-220 ?

If they are TO-92 mosfet.
Which are the suitable for your mirror, PMA?
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Old 11th November 2008, 11:45 AM   #27
jam is offline jam  United States
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Default Wilson Mirrors

Standard Wilson
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Old 11th November 2008, 11:46 AM   #28
jam is offline jam  United States
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Improved Wilson
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Old 11th November 2008, 12:03 PM   #29
jam is offline jam  United States
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Default Need a Moderator's assistance!

Maybe we are off topic and the moderators would like to break this off into a new thread?
I for one would like to hear from members about their choice and use of mirrors.

Jam
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Old 11th November 2008, 01:38 PM   #30
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Subjectively my favourite is cascoded bjt mirror, altough pma s mosfet one looks good.
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