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首页> 外文会议>MELECON 2010;IEEE Mediterranean Electrotechnical Conference >Wireless temperature sensor integrated circuits with on-chip antennas
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Wireless temperature sensor integrated circuits with on-chip antennas

机译：带片上天线的无线温度传感器集成电路

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摘要

Two wireless temperature sensors with on-chip antenna realized in 0.35 μm CMOS technology are presented. The first sensor exploits a double 3-stage ring oscillator structure, which transform the silicon substrate temperature variation into a frequency modulation. The second device is based on a PTAT (proportional to absolute temperature) sensing element, where the base-emitter voltage difference between two diode connected PNP BJT''s with different emitter currents is measured. Temperature information provided by the sensors are transmitted by means of small loop antenna structures which are realized by aluminium deposition on the top surface of the chip, eliminating the need for external connection and sophisticated packaging. The first sensor measurements show a 2.2 GHz oscillation frequency vs. temperature at 3.2 V bias voltage, for each ring oscillator. The double oscillator technique allow us to use a mathematical procedure between two different signals, in order to extract a reliable information on temperature, regardless of the frequency vs. bias voltage variation showed by ring oscillator, with the goal of avoiding a voltage regulators. The second sensor measurements show a wide voltage swing vs. temperature at 3.3 V bias voltage: this results allow us to convert this voltage in a 8-bits digital signal, in order to drive a RF-transmitter using the On-Off Keying (OOK) modulation.
机译：介绍了两个具有0.35μmCMOS技术的片上天线无线温度传感器。第一个传感器采用双三级环形振荡器结构，该结构将硅衬底的温度变化转换为频率调制。第二个设备基于PTAT（与绝对温度成比例）传感元件，其中测量了两个二极管连接的PNP BJT（具有不同的发射极电流）之间的基极-发射极电压差。传感器提供的温度信息是通过小型环形天线结构传输的，该环形天线结构是通过在芯片顶面上的铝沉积实现的，从而无需外部连接和复杂的封装。首次传感器测量结果显示，每个环形振荡器在2.2 V偏置电压下的2.2 GHz振荡频率与温度的关系。双振荡器技术允许我们在两个不同信号之间使用数学程序，以提取关于温度的可靠信息，而不管环形振荡器显示的频率与偏置电压变化如何，目的是避免使用稳压器。第二个传感器的测量结果显示在3.3 V偏置电压下电压摆幅相对于温度的变化幅度很大：此结果使我们能够将此电压转换为8位数字信号，以便使用开关键控（OOK）驱动RF发射机）调制。

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