noise of arrays
100117.200 at compuserve.com
Fri Jan 19 23:48:58 CET 1996
>> Does anybody know how noisy cheap transistor arrays (CA3046)
>> are, compared with cheap low noise transistors (BC550)?
>> The reason why I'm asking: I'd like to build this ARP all pass cascade,
>> and I wonder if I should use arrays or selected discrete transistors.
the LM3046,LM3086 have: (NS data book)
f=1kHz, Vce=3V, Ic=100 microA, Rs=1kohm Typ Low Frequency Noise 3,25db
>From RTC: at ic =2 mA
BC109 BC179 1,2 dB
BC549, BC550 1,4 dB
BC559 1,2 dB
BC560 1 dB
SSM2210: Ic=1mA f=1kHz 0,85 nV/ \/ Hz (half price of a MAT)
Don't have the knowledge to tell any conclusion.
if anyone know how to convert nV/ \/ Hz to dB please tell me.
put several 3046 in // to reduce noise but increase price.
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