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 Forum index » DIY Hardware and Software » Circuit Bending
Low pass filter
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Joelelectro



Joined: Oct 01, 2014
Posts: 9
Location: Xalapa

PostPosted: Thu Oct 02, 2014 7:33 am    Post subject: Low pass filter
Subject description: Probe a filter with LM13700
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I try to make the simulate the circuit and design the example of datasheet Voltage Controlled Low-Pass Filter i take the parameters and formulate for the low pass filter:

fo=(RA*gm)/((R+RA)2*pi*C)

The paramethers are for the:
RA=200ohm
R=100k
C=150pf
IABC=3e-6

The datasheet make reference where gm ≈ 19.2 IABC at 25°C.

and i Supposed:

fo=(200*19.2*3e-6)/((100k+200)*2pi*150pf)
and my result=122.05 hz

In the simulate i take the reference

5 μA ≤ IABC ≤ 500 μA

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My question how i can identificated my filter is corred i use the elements for the desing of the datasheet, only i can see the response.[/quote]
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blue hell
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Joined: Apr 03, 2004
Posts: 24079
Location: The Netherlands, Enschede
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PostPosted: Thu Oct 02, 2014 11:10 am    Post subject: Reply with quote  Mark this post and the followings unread

Please keep the discussion in one place - I'm going to lock this thread - the same info is at http://electro-music.com/forum/post-403919.html#403919
_________________
Jan
also .. could someone please turn down the thermostat a bit.
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