By Vahid Majidzadeh Bafar, Alexandre Schmid
Wireless Cortical Implantable platforms examines the layout for facts acquisition and transmission in cortical implants. the 1st a part of the booklet covers present approach point cortical implants, in addition to destiny units. The authors talk about the main constraints when it comes to microelectronic integrations are provided. the second one a part of the publication specializes in system-level in addition to circuit and process point ideas to the improvement of extremely low-power and low-noise microelectronics for cortical implants. current suggestions are offered and novel equipment and strategies proposed. The 3rd a part of the booklet makes a speciality of using electronic impulse radio extremely huge band transmission as an effective approach to transmit cortically neural recorded facts at excessive information price to the skin global. unique architectural and circuit and method recommendations are discussed.
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Additional info for Wireless Cortical Implantable Systems
2 V low voltage LDO regulator which targets the Neuro+II IC. 8 V LDO regulator, a symmetric single-ended cascode compensation technique is utilized to stabilize the regulator. 8 V LDO Voltage Regulator The overall architecture of the on-chip voltage regulator is presented in Fig. 3a . No external component is required in this architecture, which reduces the total cost and facilitates the system installation in vivo. 8 V POR & Start-up VREF1 VREF2 Bandgap IREF1 IREF2 CL2-onchip CL1-onchip + (a) VDD M4a M4b Vb3 M3a M14 M12 M9 M15 CTR_PSRR x1a x1b M1a M1b VREF M16 M11 M2b Cc2 Vb1 Vout Vb3 x2b Vb2 M2a MP CM2 M13 M3b x2a M10 CM1 Cc1 M5 M6 Core Error Amplifier Vfb VREF M8 M17 CL M18 M19 Vb1 M7 PSRR Booster M20 Pass Transistor (b) Fig.
In , a derivative feedback path guarantees the stability at the expense of additional active circuitry and a ground current of 65 µA. Cascode compensation with dynamic bandwidth boosting is proposed in , which guarantees stability over the full range of alternating load current, at the cost of increased power consumption. This chapter is organized as follows. 8 V LDO voltage regulator used in the Neuro+I IC is presented in Sect. 2 We demonstrate that a symmetric single-ended cascode compensation technique can be used to stabilize the regulator over the full range of alternating load current, thereby eliminating the need of any additional active circuitry  or a dynamic bandwidth boosting technique .
32 3 Power Transmission and Voltage Regulation Fig. 7 dB Not boosted Boosted -30 Magnitude (dB) -40 -37 dB -50 -60 -70 -80 -90 1k 10k 100k 1M Frequency (Hz) Fig. 12 shows the measured supply voltage gain at 2 mA load current. 3 dB improvement. 3 dB. The measured improvement is 5 dB smaller than values predicted from simulations, due to extra parasitic capacitance on the gate node of pass transistor M p . 13 shows the measured supply voltage gain versus load current at 1 MHz. 8 V LDO Voltage Regulator Not Boosted Boosted -25 Magnitude (dB) 33 -30 -35 -40 CM2 switching point in adaptive boosting technique -45 0 1 2 3 4 5 Load current (mA) Fig.