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A 0.45-V Low-Power OOK/FSK RF Receiver in 0.18 μ m CMOS Technology for Implantable Medical Applications
Abstract— A 0.45-V low-power 0.18 μm CMOS OOK/FSK RF receiver for implantable medical applications is proposed. The re-ceiver utilizes a wake-up mechanism to adjust its power consumption automatically by reading the amplitude of the input wireless OOK/FSK modulated RF signal directly. No additional wireless wake-up commands are required. Such a normally-off and instant-on scheme reduces the power consumption of this receiver significantly. The power consumption is 129 μW in sleep mode and 352 μW in wake-up mode. Other techniques, such as third-order-harmonic cancellation, subharmonic mixing, and forward body biasing are also adopted for better linearity, higher LO-to-RF isolation, and lower VDD, respectively. The measurement results show that the proposed receiver consumes only 2.6 nJ/bit (OOK) and 1 nJ/bit (FSK) to achieve the sensitivities of − 55 dBm (OOK) and − 53.5 dBm (FSK) in BER < 10− 3 constraint. The proposed receiver is designed for low-power and short-distance MICS band applications. The power consumption of high-frequency receiver might be high and its antennae should design for dual-band operation. To solve this problem, wake-up and data-transmission receivers of a dual receiver operate at simi-lar frequency around 400 MHz–405 MHz.< final year projects >
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