Wireless Charging Demodulation Circuit Using Integer Sampling Frequency

The patent changes the sampling frequency parameter to be an integer multiple of the operating frequency. This parameter change allows the use of lower-order filters while maintaining effective signal separation, as the integer multiple relationship creates predictable spectral patterns that are easier to filter. Specifically, when the sampling frequency is an integer multiple of the operating frequency, the power control signals appear at specific harmonic positions that can be separated using simpler filtering techniques compared to arbitrary sampling frequencies.

By setting the sampling frequency as an integer multiple of the operating frequency, the patent enables the use of lower-order filters which are cheaper and easier to manufacture. The integer multiple relationship creates a structured spectral distribution where power control signals appear at predictable harmonic positions, allowing effective separation with simpler, less expensive filtering components compared to conventional approaches requiring complex high-order filters.

The patent simplifies circuit design by establishing an integer multiple relationship between sampling frequency and operating frequency. This parameter relationship creates regular spectral patterns where power control signals appear at predictable harmonic positions, making the filtering process more straightforward. The design complexity is reduced because engineers can use standard lower-order filter designs rather than complex high-order filters, and the integer multiple relationship provides a clear design framework for signal separation.