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[SOLVED] amplifier gain is negative

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deepsetan

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Hi guys,

I'm trying to oscillate resonator at high frequency using pierce oscillator topology and it works but why it producing a negative gain?

amplifier_gain.png

24GHz_resonator.png

915MHz_resonator.png
 

deepsetan

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It looks like the amplifier has loss, not gain.

What do you mean by that loss?. When I simulate the amplifier without resonator, it produce about 8dB. But when I connecting a resonator to it, the value becomes -21.00 something. Do you mean that I've done wrong to the amplifier connection?

- - - Updated - - -

amplifier 2.png

Now I changed it to 10MHz resonator and the value is positive. What is the difference?
 

Audioguru

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Each schematic is different. I see no amplifier and no oscillator.
Why is the output from the very high impedance output of the resonator instead of from the low impedance of the output of the amplifier?
 

deepsetan

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Each schematic is different. I see no amplifier and no oscillator.
Why is the output from the very high impedance output of the resonator instead of from the low impedance of the output of the amplifier?

Hi,

Thanks. I already changed the Vo to the low impedance of the output of the amplifier and it works! Thank you.
 

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