Review Article
Advances in Microelectronics for Implantable Medical Devices
Table 2
Comparison of wireless multichannel neural recording systems.
| | Parameter | [113] | [59] | [55] | [114] | [115] | [56] | [67] | [54] | [116] | [15] |
| | Year | 2007 | 2009 | 2009 | 2010 | 2010 | 2012 | 2012 | 2013 | 2013 | 2013 |
| | Number of channels | 100 | 64 | 128 | 64 | 32 | 96 | 64 | 100 | 64 | 64 |
| | CMOS process (m) | 0.5 | 0.5 | 0.35 | 0.35 | 0.5 | 0.13 | 0.13 | 0.5 | 0.13 | 0.13 |
| | Area (mm2) | 27.73 | N/A | 63.36 | 8.37 | 16.27 | 25 | 18.4 | 25.48 | 12 | 12 |
| | Supply voltage (V) | 3.3 | 1.8 | 3.3 | 3 | 3 | 1.2 | 1.2 | 3 | 1.2 | 1.2/3 |
| | Total power (mW) | 13.5 | 14.4 | 6 | 17.2 | 5.85 | 6.5 | 0.38 | 6/90.6 | 5.03 | 1.4 |
| | Power per channel (W) | 135 | 225 | 46.87 | 269 | 182.8 | 67.7 | 5.93 | 906 | 78.5 | 21.8 |
| | Amplifier gain (dB) | 40 | 60 | 40 | 65–83 | 67.8–78 | 54 | 47.5–65.5 | 46 | 54–60 | 54–60 |
| | Low frequency corner (Hz) | 300 | 10 | 0.1 | 1 | 0.1 | 280 | 200 | 1 | 10 | 1 |
| | High frequency corner (kHz) | 5 | 9.1 | 20 | 10 | 8 | 10 | 6.9 | 7.8 | 5 | 5 |
| | Input-referred noise () | 5.1 | 8 | 4.9 | 3.05 | 4.62 | 2.2 | 3.8 | 2.83 | 6.5 | 5.1 |
| ADC resolution (bits)
Sampling frequency (kHz) | 10
15 | 8
62.5 | 9
640 | 7.2
20 | 8.1
N/A | 10
31.25 | 7.65
27/90 | 12
20 | 7.8
57 | 7.6
≤100 |
| Downlink modulation
Carrier frequency (MHz) | ASK
2.64 | FSK
4/8 | N/A | N/A | N/A | N/A | OOK
40.68 | N/A | OOK
915 | N/A |
| Uplink modulation
Carrier frequency (GHz) | FSK
0.433 | OOK
0.070–0.2 | UWB
4 | FSK
0.4 | FSK
0.915 | UWB
N/A | LSK
0.004 | FSK
3.2/3.8 | FSK
0.915 | UWB
0–1/3.1–10.6 |
| | Data rate (Mbps) | 0.33 | 2 | 90 | 1.25 | 0.709 | 30 | 1.92 | 48 | 1.5 | 10 |
| | On-chip signal processing | Yes | Yes | Yes | Yes | Yes | No | Yes | No | Yes | Yes |
| | Power source | Inductive | Inductive | Battery | Battery | Inductive | Battery | Inductive | Battery | Battery | Battery |
| | Stimulation capability | No | No | No | No | No | No | No | No | No | Yes |
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