IEEE Trans Biomed Circuits Syst. 2011 Aug;5(4):357-67. doi: 10.1109/TBCAS.2011.2126570.
In this paper, wireless telemetry using the near-field coupling technique with round-wire coils for an implanted cardiac microstimulator is presented. The proposed system possesses an external powering amplifier and an internal bidirectional microstimulator. The energy of the microstimulator is provided by a rectifier that can efficiently charge a rechargeable device. A fully integrated regulator and a charge pump circuit are included to generate a stable, low-voltage, and high-potential supply voltage, respectively. A miniature digital processor includes a phase-shift-keying (PSK) demodulator to decode the transmission data and a self-protective system controller to operate the entire system. To acquire the cardiac signal, a low-voltage and low-power monitoring analog front end (MAFE) performs immediate threshold detection and data conversion. In addition, the pacing circuit, which consists of a pulse generator (PG) and its digital-to-analog (D/A) controller, is responsible for stimulating heart tissue. The chip was fabricated by Taiwan Semiconductor Manufacturing Company (TSMC) with 0.35-μm complementary metal-oxide semiconductor technology to perform the monitoring and pacing functions with inductively powered communication. Using a model with lead and heart tissue on measurement, a -5-V pulse at a stimulating frequency of 60 beats per minute (bpm) is delivered while only consuming 31.5 μW of power.
本文提出了一种使用圆形线圈进行近场耦合的无线遥测技术，用于植入式心脏微刺激器。该系统包括一个外部供电放大器和一个内部双向微刺激器。微刺激器的能量由一个整流器提供，该整流器可以有效地为可充电设备充电。一个完全集成的稳压器和一个电荷泵电路分别用于产生稳定的、低电压和高电位的电源电压。一个微型数字处理器包括一个相移键控 (PSK) 解调器，用于解码传输数据，以及一个自保护系统控制器，用于操作整个系统。为了获取心脏信号，一个低电压和低功耗的监测模拟前端 (MAFE) 执行即时阈值检测和数据转换。此外，起搏电路由脉冲发生器 (PG) 和其数字到模拟 (D/A) 控制器组成，负责刺激心脏组织。该芯片由台湾积体电路制造公司 (TSMC) 采用 0.35-μm 互补金属氧化物半导体技术制造，用于执行监测和起搏功能，并通过感应供电进行通信。在使用带有导线和心脏组织的模型进行测量时，在 60 次/分钟的刺激频率下可输送-5-V 脉冲，而功耗仅为 31.5 μW。
