Balanced Frequency Converter (Suitable for Frequencies up to 50kHz)
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This circuit takes advantage of aliasing that occurs in any time sampled system. The output signal frequency is the difference in frequency between the input signal and the switch sampling rate. A 24KHz input signal sampled at 25KHz will be converted to a 1KHz output signal. In addition by using the LTC1992 fully differential amplifiers the input signal can be single ended and the converted output signal can be differential.