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| stephen_weinreich [2020/03/31 13:16] – created 0.0.0.0 | stephen_weinreich [2020/04/01 16:25] (current) – reric | ||
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| **Email:** weinreich AT stanford DOT edu | **Email:** weinreich AT stanford DOT edu | ||
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| ====== **An adaptive NB-IoT antenna interface using frequency-translated baseband impedances** | ====== **An adaptive NB-IoT antenna interface using frequency-translated baseband impedances** | ||
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| ==== **The NB-IoT standard** | ==== **The NB-IoT standard** | ||
| - | The NB-IoT standard targets low-end IoT devices. Peak data rates are limited to 250 kbps due to the 180 kHz signal bandwidth but as a result ultra-low power consumption is achievable. Industrial and environmental sensors are among the IoT applications which require long battery life with low requirements on data rate.& | + | The NB-IoT standard targets low-end IoT devices. Peak data rates are limited to 250 kbps due to the 180 kHz signal bandwidth but as a result ultra-low power consumption is achievable. Industrial and environmental sensors are among the IoT applications which require long battery life with low requirements on data rate. Additionally, |
| ==== **Frequency-translated impedances** | ==== **Frequency-translated impedances** | ||
| - | Recent advances in RF interfaces have seen the use of the passive mixer to perform both the filtering and downconversion operations on silicon[[2]]. Such frequency-translational circuits have been around for over 50 years[[3]], but it is only with recent technology scaling that they have become practical at radio frequencies. In addition to providing an easily tunable, low area, and high Q filter, passive mixers translate the baseband impedances up to RF as seen in Figure 1. In this project we will use a mixer-first receiver in order to exploit this property and achieve enhanced impedance matching for small, high-Q antennas through the use of flexible baseband impedances.**< | + | Recent advances in RF interfaces have seen the use of the passive mixer to perform both the filtering and downconversion operations on silicon[2]. Such frequency-translational circuits have been around for over 50 years[[3]], but it is only with recent technology scaling that they have become practical at radio frequencies. In addition to providing an easily tunable, low area, and high Q filter, passive mixers translate the baseband impedances up to RF as seen in Figure 1. In this project we will use a mixer-first receiver in order to exploit this property and achieve enhanced impedance matching for small, high-Q antennas through the use of flexible baseband impedances. |
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| - | <br>{{wiki:Sw freq translation.png}}< | + | {{wiki:Sw freq translation.png}} |
| **Figure 1: Concept of frequency-translated baseband impedance** | **Figure 1: Concept of frequency-translated baseband impedance** | ||
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| - | [[1]] 3GPP TS36.101, “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) radio transmission and reception, | + | [1] 3GPP TS36.101, “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) radio transmission and reception, |
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| + | [2] Andrews, C., & Molnar, A. (2010). A passive mixer-first receiver with digitally controlled and widely tunable RF interface. IEEE Journal of Solid-State Circuits, 45(12), 2696–2708. http:// | ||
| + | [3] Franks, L. E., & Sandberg, I. W. (1960). An Alternative Approach to the Realization of Network Transfer Functions: The N -Path Filter. Bell System Technical Journal, 39(5), 1321–1350. http:// | ||
