This paper presents a 922 MHz power-efficient configurable frequency-shift keying–on–off keying (FSK–OOK) phase-locked loop (PLL)-based transmitter. The proposed transmitter works as a multimode structure with configurable data rate and output power. In OOK modulation, by duty cycle adjustment of input data and producing return-to-zero data (RZ-data) by a simple circuit, the data rate can be scaled with power consumption. This implies that any desired level of output power can be transmitted with different power consumption according to the power budget. The transmitter benefits from a new phase frequency detector, an improved charge pump and a low-power voltage-controlled oscillator. The proposed structure represents data rate of 0.24–2.4 Mb/s in OOK mode and 1.8 Mb/s in FSK mode, and it can deliver output power level from − 19.71 to 0.53 dBm. The efficiency of the transmitter at RZ–OOK modulation with data rate of 2.4 Mb/s and output power of 0.53 dBm is 57.25%. Also, the efficiency of transmitter in FSK modulation is 22.1%. The post-layout simulation results in 0.18 µm RF CMOS process are obtained and verify the effectiveness of the proposed circuit.

中文翻译：

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具有可扩展数据速率的节能可配置 FSK-OOK 发射器，适用于无线医疗应用

本文介绍了一种基于 922 MHz 功率效率的可配置频移键控-开-关键控 (FSK-OOK) 锁相环 (PLL) 发射器。所提出的发射机作为多模结构工作，具有可配置的数据速率和输出功率。在 OOK 调制中，通过输入数据的占空比调整并通过简单的电路产生归零数据（RZ-data），数据速率可以随功耗而定。这意味着可以根据功率预算以不同的功耗传输任何所需的输出功率水平。发射器受益于新的相位频率检测器、改进的电荷泵和低功耗压控振荡器。所提出的结构在 OOK 模式下代表 0.24–2.4 Mb/s 的数据速率，在 FSK 模式下代表 1.8 Mb/s 的数据速率，它可以提供从 − 19.71 到 0.53 dBm 的输出功率电平。发射机在 RZ-OOK 调制下的效率为 57.25%，数据速率为 2.4 Mb/s，输出功率为 0.53 dBm。此外，FSK 调制中发射机的效率为 22.1%。获得了 0.18 µm RF CMOS 工艺的布局后仿真结果，并验证了所提出电路的有效性。