A novel FM demodulation scheme

A review of vibration signal estimation techniques employed in ultrasonic vibration measurement systems is presented. The review focuses on the Doppler signal extraction methods including the theory and analysis pertaining to the background of ultrasonic vibration measurement techniques. The phase modulated received signal in the vibration measurement system involves constant phase shift because of ultrasonic path length, phase shift introduced by Doppler effect because of vibrating object and the parametric phase shift caused by interaction of high frequency ultrasonic wave and low pressure developed by vibrating object. Among the three phase shifts, the Doppler phase shift contains the vibrating signal information and the extraction of Doppler signal helps in knowing the velocity of the vibrating object, amplitude and phase of the vibration. Various techniques of Doppler phase shift retrieval are categorised based on the modulation index estimation procedures from the received ultrasonic signal. An analysis is made based on the information retrieval methods for estimation of vibration signal parameters, range of the vibration amplitude, frequency and the preferable carrier frequency for transmission. Further, the analysis also presents various applications in which ultrasonic vibration measurements system are employed successfully.

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“…where S(t) is the mean of S(t). Thus, β can be estimated using differentiating [52] or integrating (16)…”

Section: Doppler Signal Extractionmentioning

confidence: 99%

Vibration parameter estimation methods for ultrasonic measurement systems – a review

Singh

Sumathi

2015

IET Science, Measurement & Technology

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“…Nauta et al [1] described a demodulation system, which was designed using Bipolar Junction Transistor (BJT) and cannot be implemented using CMOS technology. Kiranon et al [2] illustrated a demodulator, which was compatible for frequency modulation (FM). Design depicted by Nebel et al [3] and Gunnar et al [4], demonstrated the use of Operational Amplifier (OpAmp), yielding more than ten capacitive loads.…”

Section: Introductionmentioning

confidence: 99%

A Low Ripple Low Power CMOS Demodulator for 13.56 MHz RFID Reader

Karim¹,

Ali²,

Reaz³

et al. 2010

Frequenz

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This study concerns about a high frequency spectrum companionable CMOS demodulator design for RFID application. In this paper,implementation of a demodulator is described for 13.56 MHz RFID Reader employing 0.18um CMOS technology, showing smaller ripple(<0.3) than that of existing systems. The designed demodulator consists of an amplifier and a detector, which consumes a power of 51.4 uWatt at 1 V biasing.

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“…A FM demodulator based on cross-coupled phase locked loop consists of two phase lock loops, one for tracking and demodulating the stronger received signal and the other PLL to track and demodulate the weaker received signal has been proposed in [7]. A FM demodulation scheme using differentiators has been proposed and implemented with simple analog circuit elements [8].…”

Section: Introductionmentioning

confidence: 99%

Frequency demodulation using sliding DFT based phase locking scheme

Sumathi

2012

2012 IEEE 55th International Midwest Symposium on Circuits and Systems (MWSCAS)

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Sliding Discrete Fourier Transform (SDFT) based phase locking scheme (PLL) is employed to extract the modulation signal from the sinusoidal phase or frequency modulated carrier. Adaptive sampling control based SDFT PLL has been proposed for frequency demodulation. This PLL holds the unique advantage of wider operating range, which has been utilized in the frequency demodulation. Simulation studies prove the efficiency of the demodulation method in retrieving the frequency of modulation signal.

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A novel FM demodulation scheme

Cited by 6 publications

References 3 publications

Vibration parameter estimation methods for ultrasonic measurement systems – a review

Vibration parameter estimation methods for ultrasonic measurement systems – a review

A Low Ripple Low Power CMOS Demodulator for 13.56 MHz RFID Reader

Frequency demodulation using sliding DFT based phase locking scheme

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