Conference Paper

A 120μW MICS/ISM-band FSK receiver with a 44μW low-power mode based on injection-locking and 9x frequency multiplication

DOI: 10.1109/ISSCC.2011.5746397 Conference: Solid-State Circuits Conference Digest of Technical Papers (ISSCC), 2011 IEEE International
Source: IEEE Xplore

ABSTRACT For true low-power peer-to-peer wireless links for sensing, link symmetry must be maintained unlike in [1,2] where the burden is shifted to the receiver. In addition, the transceiver power dissipation and performance should be adaptive to save power when the link distance is short. We present a 120μW MICS/ISM band receiver with -90dBm sensitivity at a data-rate of 200kb/s with BER<;0.1%. The receiver incorporates a 44μW low-power (LP) mode that achieves -70dBm sensitivity at 200kb/s and 0.1% BER. At a lower data-rate of 20kb/s, the LP mode can be used as a wake-up receiver with increased sensitivity of -75dBm with 1 % BER and 38μW power consumption.

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    ABSTRACT: A 400MHz on-off keying transceiver for medical implant applications is presented. The transceiver achieves ultra-low power and high sensitivity with an analog "quadratic sum" demodulation scheme, which enables the using of a low intermediate frequency and a free-running oscillator for power saving. A new current-reuse structure and an inductor-sharing technique for front-end are also introduced to further reduce power consumption. The transceiver is implemented in 0.18μm CMOS process with 3.18mm 2 chip area. At 2 Mbps data rate, the receiver achieves energy efficiency of 1.71nJ/bit with sensitivity of -80.2dBm for 10 -3 BER, and the transmitter achieves energy efficiency of 1.53nJ/bit with -2.17dBm output power.
    Proceedings of the 37th European Solid-State Circuits Conference, ESSCIRC 2011, Helsinki, Finland, Sept. 12-16, 2011; 01/2011