Gilbert Cell - Mixer - Analog Multiplier

This video is about the Gilbert cell which produces an output signal proportional to the product of two input signals. Such circuits are widely used for frequency conversion in radio systems. The advantage of this circuit is the output current is an accurate multiplication of the (differential) base currents of both inputs. As a mixer, its balanced operation cancels out many unwanted mixing products, resulting in a "cleaner" output.
Differential Amplifier: • Differential Amplifier...
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[@theoryandapplication7197]

thank you

[@addielvega]

Overall, this is a good video. One thing is: try to speak a little louder, it is hard to hear. I was trying to follow you last spice model and I get completely different results on LTspice with the same value you shown what model are you using for the transistors?