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AD630 debug problem

Question asked by 王永千 on Mar 18, 2015
Latest reply on Mar 25, 2015 by 王永千

hi

I’m looking to implement an amplifier in the range of 100KHz to 2MHz to obtain amplitude and phase information.

I followed the design in circuit diagram 9a Gain-of-One balanced modulator. Pin 3-6 and the capacitors with powers are not connected.

3.png

Signals input to modulation input and carrier input are same, which is the yellow signal in the picture below. And the blue line is the result. It is very different from the result of simulation (the red signal).

1.png

2.png


Why the results are so inconsistent? What I have missed?



Thanks

Wang Yongqian

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