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| General Electronics Chat This forum is for general chat about electronics, eg: Dont know what a part does? Dont know how to read a circuit? Want to get an opinion? |
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Thread Tools | Display Modes |
3rd November 2007, 01:44 AM
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gain of LM565 VCO?
I'm trying to calculate the gain factor of a VCO in the LM565. Is there a general equation for this using values given on the LM565 datasheet?
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3rd November 2007, 02:15 AM
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Derive from "demodulated output voltage" at 10% deviation.
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3rd November 2007, 03:23 AM
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You can calculate it from the datasheet, at least for (Vcc-Vee)=12V.
VCO gain at Fo=10k is Ko=(6600*2*pi) rad/sec/V = 4.15*10^4 (see attachment). Since Ko is proportional to Fo (see attachment), Ko=6600*2*pi*Fo/10000 Ko=4.15*Fo Therefore, if, for example, Fo=3kHz, Ko=4.15*3000 = 1.244*10^4 rad/sec/V. You can see that Ko is also inversely proportional to Vc. Kd will vary slightly with Vc, but the phase detector has internal diode clamps, so you could probably calculate Ko fairly accurately at other supply voltages also. |
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