Amplitude Modulation Circuit of Analog Switch

Published:2011/7/11 7:37:00 Author:Michel | Keyword: Analog Switch, Amplitude Modulation Circuit | From:SeekIC

AD7512 and differential amplifiers A2 are used to complete the work. The carrier controls simulation switch and switch contact is connected to the upward side and it inputs via A2 inverse end.The modulation wave is reversed and it returns to normal phase when the next carrier wave comes and the process repeats again and again to achieve the purpose of modulation amplitude limit.It will not stop becuase of carrier cycle but only causes reversal polarity.Analog switch needs to keep up with the carrier frequency, but analog switch frequency can't be high, so the circuit can not be used in high frequency.Modulation output contains the higher harmonic square wave signal and bandpass filter should be added to get the sine wave signal.



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