Digital demodulator for optical FSK signals

Ahlbom, G.; Egnell, L.; Wickman, C.

doi:10.1049/el:19900192

Cited by 6 publications

(2 citation statements)

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“…16. For comparison, a conventional zero-IF demodulator is also designed and fabricated on the same chip [18], 2 1 PRBS is applied to the TX side to draw the eye diagrams. The upper waveform shows that the absolute jitter is reduced by 60% with the DLL-based demodulator.…”

Section: Implementation Resultsmentioning

confidence: 99%

“…zero-crossing is used for data detection. Conventionally, the demodulation method using flip-flops for lead/lag detection of the I and Q signals has been widely used for low cost FSK radios because of its simple implementation [18]. However, the zero-IF demodulator introduces large amount of jitter at every data transition originated from the zero crossing delay.…”

Section: Withmentioning

confidence: 99%

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A 60 kb/s–10 Mb/s Adaptive Frequency Hopping Transceiver for Interference-Resilient Body Channel Communication

Cho

Yan

Bae

et al. 2009

IEEE J. Solid-State Circuits

116

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An interference-resilient 60 kb/s-10 Mb/s body channel transceiver using the human body as a signal transmission medium is designed for multimedia and medical data transaction in body-area network. The body antenna effect which interferes with signals in the human body channel is examined. The body-induced interferences degrade the SIR of the signal to 22 dB in the worst case. In order to overcome the body antenna effect, a 4-channel adaptive frequency hopping scheme using the 30-120 MHz band is introduced to the body channel transceiver. A direct-switching modulator using dual frequency synthesizers and a DLL-based demodulator are proposed for 10 Mb/s FSK and the 4.2 s hopping time. The transceiver fabricated with 0.18 m CMOS withstands 28 dB SIR and its operating distance is over 1.8 m with 25 dB SIR. Its energy consumption is 0.37 nJ/b with 65 dBm sensitivity.

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Section: Implementation Resultsmentioning

confidence: 99%

Section: Withmentioning

confidence: 99%