The four-quadrant multiplier uses the AD834 multiplier chip to realize the multiplication operation of 4 channels, and the bandwidth can reach 500MHz. Since the output form of the AD834 chip is a collector differential current pair, an unbalanced-balanced transformer ETC1-1-13TR is used at the back end of the circuit to convert the double-ended current output into a single-ended voltage output to facilitate the next-level coupling of the signal. and observations.
Physical map:
Test results:
The fundamental wave signal is a sine wave with a frequency of 1kHz and an amplitude of 2V. The carrier signal is a sine wave with a frequency of 1MHz and an amplitude of 2V.
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