Low Power FSK Receiver Using an Oscillator-Based Injection-Locked Frequency Divider

Abstract

This letter presents a novel frequency-shift keying (FSK) receiver using an oscillator-based injection-locked frequency divider (ILFD), thereby achieving high sensitivity, low dc-offset, and low power consumption. The proposed receiver comprises a low-noise amplifier, a divide-by-2 ring-oscillator-based ILFD, and a subharmonic mixer. Moreover, the proposed receiver is fabricated using 0.18 CMOS process and consumes 1.1 mW. Measurement results demonstrate that the proposed receiver has a sensitivity of 83 dBm at bit error rate with 1 Mb/s data rate in receiving a 2.4 GHz Gaussian FSK signal.

Low‐power multi‐band injection‐locked wireless receiver in 0.13 μ m CMOS

“…Prominent examples of receiver architectures utilized for low-power applications that can maintain sub-mW and achieve excellent performance include the tuned RF (TRF), uncertain-IF, and the super-regenerative on-off-keying (OOK)-based designs [1,[4][5][6][7][8][9][10][11][12]. An alternative structure, known as the injection-locked oscillator (ILO) based envelope detection receiver offers a simplified architecture, demonstrating superior performance as well as its remarkable ability to perform frequency-to-amplitude conversion [2,3,[13][14][15][16][17][18]. The ILO receiver adopts a unique natural phenomenon known as injection-locking, where an oscillator, when perturbed or injected by a sufficiently large periodic signal at a nearby frequency will shift the oscillator to the frequency of the injection signal.…”

“…The transceiver requires an additional demand of the available power budget in comparison to the remaining modules in response to the power-hungry analog CMOS circuit blocks, for example, power amplifier, RF gain stage, low-noise amplifier (LNA). However, reducing the power dissipation and maintaining high-performance operation has demonstrated to be a difficult task, resulting in active research in low-power wireless receiver designs for WSN applications [1][2][3]. In general, the work involved in the development of sensor node transceivers reduces the overall complexity of the architecture and trades bandwidth (BW) efficiency for energy efficiency.…”