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. Author manuscript; available in PMC: 2019 Nov 25.
Published in final edited form as: J Neural Eng. 2019 Oct 9;16(6):066003. doi: 10.1088/1741-2552/ab2610

Figure 8.

Figure 8

A weak LFP signal is injected into the inputs of the Chebyshev notch channel and the DP-301 commercial differential amplifier (ADInstruments). (a) Comparison of the Chebyshev notch channel’s output (red line—after removing the gain of 80 dB) with the DP-301 amplifier’s output (blue line—after removing the gain of 80 dB) in the time domain. (b) The amplitude spectrum of the Chebyshev notch channel’s output (red line) approximates the amplitude spectrum of the original LFP signal (pink line). (c) The LFP recordings acquired by the Chebyshev notch channel and the DP-301 amplifier approximate each other. This shows that the proposed AFE architecture is capable of recording weak LFP signals without introducing any phase distortion or ringing oscillations. (d) The proposed AFE architecture provides more accurate recording of the high frequencies (f > 350 Hz) included in the original LFP signal in comparison to the DP-301 amplifier.