A 2.4GHz ULP OOK single-chip transceiver for healthcare applications

Autonomous operation of super-regenerative receiver in BAN

“…2, the optimal quench current waveform (Iquench) generated by the quench waveform generator (QWG) in [8] uses the "di�clk_qch" clock to control the duty cycle of the DAC current, IOAc. This IOAc level is adjusted by setting the number of bits and adjusting the referent current.…”

“…The Icritical is the minimum bias current level at which the RF oscillator starts oscillating. The selectivity is improved by maintaining the oscillator first in the Q-enhancernn et mode (Iquench < Icritical) and after that in the amplification mode (Iquench > Icritical) [8]. : an elk qeh : Q-enchancement: Amplification:…”

“…In [8], we showed that a good calibration of the quench waveform parameters (DAC and ANA) can enable decent performance results for the ultra-low power super-regenerative receiver. In this section, we show the method of how these parameters could be calibrated.…”

“…The probability can be expressed as V. MEASUREMENT RESULTS (4) In this section, we provide the measured spectrum sensing results of a quench waveform calibrated super-regenerative receiver. In the measurement, the chip described in [8] is adopted as the hardware of the super-regenerative receiver. Its operation is controlled by the MSP430 microcontroller in which the quench waveform calibration and spectrum sensing algorithms are implemented.…”

An energy-efficient OFDM-based baseband transceiver design for ubiquitous healthcare monitoring applications

“…However, these candidate systems have difficulties to meet consumer electronic devices and healthcare systems at the same time due to the power cost. Accordingly, some WBAN systems are proposed in these years [3][4][5], which present simple FSK/OOK modulation schemes to achieve lower transmission power. However, the data rate of these implementations is limited, resulting in long active duration and low transmission energy.…”