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Why does unsymmetric signals come out of a symmetric circuit

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katrin

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I am doing simualtion on a completely symmetrical differential circuit-Gilbert mixer.

When the input signal power is too large, the out put signal would be distorted because of the large signal nonlinearity effect. But the way the signal is distorted seems to be unresonable, the signals become unsymmetrical.

Really confused, anyone has some idea on it?
 

zoop222

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Re: Why does unsymmetric signals come out of a symmetric cir

read this book, it may help
 

    katrin

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zoop222

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Re: Why does unsymmetric signals come out of a symmetric cir

part2
 

zoop222

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Re: Why does unsymmetric signals come out of a symmetric cir

part3
 

katrin

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Re: Why does unsymmetric signals come out of a symmetric cir

I download the first part but is not able to open it.

For the second and third part, it shows I don't have enough points to download it.

Is it the book by Gray Meyer, I have this book in hand.

Which chapter do you refer to ?

Many thanks.
 

pixel

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Re: Why does unsymmetric signals come out of a symmetric cir

Your circuit is not symetrical around horisontal axis.
Probably biasing points are not well established, or input signal is high enough to make transistors not work in active region.
 

    katrin

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layout_designer

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Re: Why does unsymmetric signals come out of a symmetric cir

Hi
Can anyone please post the details of the book.

Thanks
 

    katrin

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johncm316

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thanks but where the other part?

Added after 44 seconds:

can't unzip its need other part
 

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