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. Author manuscript; available in PMC: 2017 Jun 1.
Published in final edited form as: IEEE J Solid-State Circuits. 2017 Apr 27;52(6):1576–1590. doi: 10.1109/JSSC.2017.2686580

Fig. 4.

Fig. 4

AP recording channels. (a) Block diagram of the 2048 AP recording channels. (b) Open-loop amplifier (A1) used in the first stage and its constant-gm bias circuit. (c) Two types of pseudo resistors and their bias circuits. (d) MOSFET-only R-2R current DAC for tuning high-pass corner frequencies.