TY - JOUR
T1 - A low-power bidirectional telemetry device with a near-field charging feature for a cardiac microstimulator
AU - Lee, Shuenn Yuh
AU - Cheng, Chih Jen
AU - Liang, Ming Chun
N1 - Funding Information:
Manuscript received June 21, 2010; revised November 22, 2010, January 17, 2011; accepted February 20, 2011. Date of publication April 21, 2011; date of current version July 27, 2011. This work was supported in part by the Chip Implementation Center (CIC) and in part by the National Science Council, Taiwan, R.O.C., under Grant NSC 99-2628-E-194-032, NSC 99-2220-E-194-001, and NSC 99-2220-E-194-006. This paper was recommended by Associate Editor P. Mohseni.
PY - 2011/8
Y1 - 2011/8
N2 - 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 metaloxide 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 μ W of power.
AB - 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 metaloxide 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 μ W of power.
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U2 - 10.1109/TBCAS.2011.2126570
DO - 10.1109/TBCAS.2011.2126570
M3 - Article
C2 - 23851950
AN - SCOPUS:79960977191
SN - 1932-4545
VL - 5
SP - 357
EP - 367
JO - IEEE Transactions on Biomedical Circuits and Systems
JF - IEEE Transactions on Biomedical Circuits and Systems
IS - 4
M1 - 5754619
ER -