本文提出一方式是透過並聯兩路訊號，其中一路將雜訊分離後擷取放大，另一路為一緩衝電路，再將兩訊號調整至同相位，最後將分離出的雜訊與緩衝器之輸出訊號以電壓差放大器與相抵銷。本文透過Multisim 13.0進行電路的返真模擬，以10KHz/2V之訊號混合6V_(p-p)的雜訊作為我們的輸入，可得到極高的訊號雜訊比SNR=44.68dB，極小的相位差(<100kHz ∅≈ 0°)，以及良好的電壓轉換率Slew Rate=3.58V/μs。因本文所設計之濾波系統沒有截止頻率，相對於傳統濾波器，可保留原始訊號的高次項諧波，也意味著能保留較完整的輸入訊號之資訊。本文所設計之濾波系統，不需要使用DSP，只需要簡易的電子元件即可完成，經本文之濾波系統後，輸入訊號 V_(in(p-p)) = 715mV，輸出訊號V_(out(p-p)) = 16mV，將雜訊抑制為原訊號之2.2%。;This paper proposes a way to connect two signals in parallel, one of which is to separate and extract the noise, and the other is a buffer circuit, and then adjust the two signals to the same phase, and finally the separated noise and the output of the buffer The signal is offset by a voltage difference amplifier. This article uses Multisim 13.0 to carry out the simulation of the circuit. Using 10KHz/2V signal mixed with 6V_(p-p) noise as our input, we can get a very high signal noise ratio SNR=44.68dB, and a very small phase difference(<100kHz ∅≈ 0°),and a good Slew Rate=3.58V/μs. Because the filter system designed in this paper does not have a cut-off frequency, compared with traditional filters, it can retain the higher order harmonics of the original signal, which also means that it can retain more complete input signal. The filtering system designed in this article does not need to use DSP, and only needs simple electronic components to complete. After the filtering system in this article, the input signal V_(in(p-p)) = 715mV, the output signal V_(out(p-p)) = 16mV, the noise is suppressed to 2.2% of the original signal.
