# A Magnetic-Balanced Inductive Link for the Simultaneous Uplink Data and Power Telemetry
## 8 Conclusions
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**References** & [5] & [33] & [9] & [12] & [10] & [11] & **This Work** \\ \hline Ext./Im. Coil No. & 1/1 & 2/1 & 2/1 & 3/3 & 1/1 & 1/1 & **2/1** \\ \hline Ext./Im. Coil & 60/20 & 40,25/ & 56,22/ & 24,12,12/ & 25/16 & 40/20 & 40,16/ \\ Diameter (mm) & 60/20 & 9.5 & 22 & 24,12,12 & 20 & 20 \\ \hline \multicolumn{8}{c}{**Wireless Power Transfer**} \\ \hline Power Carrier (Hz) & 700 \(\times\) 10\({}^{3}\) & 13.56 \(\times\) 10\({}^{6}\) & 1.1/1.53 \(\times\) 10\({}^{6}\) & 1 \(\times\) 10\({}^{6}\) & 13.56 \(\times\) 10\({}^{6}\) & 2 \(\times\) 10\({}^{6}\) & 2 \(\times\) 10\({}^{6}\) \\ Typical PDL (mW) & 50 & 102 & 60 & 1.5\(\sim\)12 & \(\lesssim\)100 & 10 & 5 \\ Typical PTE & 36\% & 50\% & 36\% & 61\% & 58\% (k = 0.1) & 59\% (k = 0.1) & 59\% (k = 0.09) \\ \hline \multicolumn{8}{c}{**Uplink Data Transmission**} \\ \hline Modulation & LSK & LSK & Double & QQPSK & PPSK & BPSK & BPSK \\  & & Carrier LSK & & & & \\ Uplink Carrier (Hz) & 700 \(\times\) 10\({}^{3}\) & 13.56 \(\times\) 10\({}^{6}\) & 1.1/1.53 \(\times\) 10\({}^{6}\) & 13.56 \(\times\) 10\({}^{6}\) & 125 \(\times\) 10\({}^{3}\) & 500 \(\times\) 10\({}^{3}\) \\ Data Rate (dps) & 19.2 \(\times\) 10\({}^{3}\) & 56.5 \(\times\) 10\({}^{3}\) & 10 \(\times\) 10\({}^{3}\) & 4.16 \(\times\) 10\({}^{6}\) & 1.35 \(\times\) 10\({}^{6}\) & 10 \(\times\) 10\({}^{3}\) & 50 \(\times\) 10\({}^{3}\) \\ SIR (dB) & NA & NA & NA & NA & NA & \(-\)57.9 & \(-\)**10.07** \\ Tx Power Cost (mW) & NA & NA & NA & NA & NA & 0.6 & **0.2** \\ Max. Distance (mm) & 30 & 20 & 11 & 5 & 15 & 50 & **60** \\ Coupling Coefficient a  & 0.045 & 0.04b & 0.23 & 0.23 & 0.055 & 0.008 & **0.005** \\ BER & NA & NA & \(\leq\)2 \(\times\) 10\({}^{-6}\) & \(\leq\)1 \(\times\) 10\({}^{-5}\) & \(\leq\)1 \(\times\) 10\({}^{-7}\) & \(\leq\)1 \(\times\) 10\({}^{-7}\) \\ \hline \multicolumn{8}{c}{**The Impacts of Uplink Data Transmission on WPT**} \\ \hline PTE Relative Loss & \(>\)50\% & NA & 19\% & NA & 20\% (k = 0.05) & 15\% (k = 0.05) & **5.1\% (k = 0.05)** \\ \(V_{\text{load}}\) Ripple & NA & NA & 15\% & NA & 100\% & \(\sim\)5\% & \(\sim\)**5\%** \\ \hline \hline \end{tabular}  
* If there are multiple coupling coefficients for a system, only the largest one is used for the comparison. b Simulated by using ANSYS HFSS from the coil parameters. c The values of ripple are read from the oscilloscope waves of the load voltage in the references.  
\end{table} 
Table 2: Performance comparison. PDL, power delivered to the load; LSK, load-shift keying; PPSK, passive phase shift keying; QQPSK, offset quadrature phase shift keying; WPT, wireless power transmission; Ext., external; Im., Implant. **Author Contributions:** [PERSON] designed the inductive link system and circuits, performed the experiments and wrote the paper. [PERSON] provided the initial idea of this research and many useful comments and co-wrote the paper. [PERSON] optimized the WPT circuits and coil parameters. [PERSON] contributed to the data collection and analysis. All of the authors read and approved the final version of this paper. **Conflicts of Interest:** The authors declare no conflict of interest.