A Sub-1&amp;#x03BC;A Low-Power FSK Modulator for Biomedical Sensor Circuits

Zhu, Kai; Haider, Mohammad Rafiqul; Yuan, Shuguang; Islam, Syed K.

doi:10.1109/isvlsi.2010.74

Cited by 7 publications

(8 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Compared to PLL-based modulators [2,17,18], an FSK modulator featuring a SAW radio frequency (RF) resonator exhibits higher frequency stability due to the high Q of resonators and lower power consumption due to reduced number of blocks in the modulator circuit, which are replaced by the resonator [4]. The open-loop operation [19,20] of resonator based modulators makes the system simpler and more compact than the…”

Section: A Novel Fsk Modulator Based On the Proposed Resonatormentioning

confidence: 99%

A high-impedance dual-mode SAW resonator for ultra low power and high data rate FSK modulator

Zhu

Zheng

Sun

et al. 2014

Sensors and Actuators A: Physical

View full text Add to dashboard Cite

Section: A Novel Fsk Modulator Based On the Proposed Resonatormentioning

confidence: 99%

A high-impedance dual-mode SAW resonator for ultra low power and high data rate FSK modulator

Zhu

Zheng

Sun

et al. 2014

Sensors and Actuators A: Physical

View full text Add to dashboard Cite

“…To monitor the various physiological parameters inside the human body, the transmitter unit sends the sensor data outside the human body as explained by Zhu et al [ 64 ]. This paper proposed a new low-power (FSK) modulator for biomedical sensors.…”

Section: Fsk Modulation and Demodulationmentioning

confidence: 99%

Modulation Techniques for Biomedical Implanted Devices and Their Challenges

Hannan

Abbas

Samad

et al. 2011

Sensors

View full text Add to dashboard Cite

Implanted medical devices are very important electronic devices because of their usefulness in monitoring and diagnosis, safety and comfort for patients. Since 1950s, remarkable efforts have been undertaken for the development of bio-medical implanted and wireless telemetry bio-devices. Issues such as design of suitable modulation methods, use of power and monitoring devices, transfer energy from external to internal parts with high efficiency and high data rates and low power consumption all play an important role in the development of implantable devices. This paper provides a comprehensive survey on various modulation and demodulation techniques such as amplitude shift keying (ASK), frequency shift keying (FSK) and phase shift keying (PSK) of the existing wireless implanted devices. The details of specifications, including carrier frequency, CMOS size, data rate, power consumption and supply, chip area and application of the various modulation schemes of the implanted devices are investigated and summarized in the tables along with the corresponding key references. Current challenges and problems of the typical modulation applications of these technologies are illustrated with a brief suggestions and discussion for the progress of implanted device research in the future. It is observed that the prime requisites for the good quality of the implanted devices and their reliability are the energy transformation, data rate, CMOS size, power consumption and operation frequency. This review will hopefully lead to increasing efforts towards the development of low powered, high efficient, high data rate and reliable implanted devices.

show abstract

“…The FSK modulator reported in this paper uses a currentstarved inverter chain oscillator [25] as shown in Fig. 6.…”

Section: Fsk Modulatormentioning

confidence: 99%

“…Suppose V TH is the threshold voltage of INV0, according to [25], the rise time and fall time of INV0 can be expressed as: …”

Section: Fsk Modulatormentioning

confidence: 99%

Simple oscillators-based readout circuit for low-power biomedical implant system

Zhu

Islam

Haider

et al. 2012

Analog Integr Circ Sig Process

Self Cite

View full text Add to dashboard Cite

This paper reports a wireless sensor readout circuit for continuous physiological parameters monitoring including a potentiostat, a data generation unit and a frequency-shift-keying (FSK) modulator unit with the low drop-out (LDO) regulator for biomedical implant system. The potentiostat can generate an output potential of 0.7 V for the data generation unit. The data generation unit is designed based on a relaxation oscillator scheme and can be used to sense a current signal from any amperometric biomedical sensor and convert the signal to a square waveform in which the frequency of the square wave signal is proportional to the sensor current. FSK modulation scheme has been selected for wireless transmission. Designed with a very simple ring oscillator, this modulator integrates the modulation functionality into the oscillator itself by using the data signal to control the oscillation frequency. The prototype circuits have been fabricated in a 0.35 lm bulk complementary metal-oxide semiconductor (CMOS) process. Working with a regulated 1.8 V supply, the potentiostat consumes only 2 lA of current while the data generation unit can generate around 15.7 kHz output frequency with an input current of 1 lA. The FSK modulator consumes a total current of around 19 lA for a carrier frequency around 1 MHz. An off-chip demodulator is constructed to demodulate the data signal from the FSK modulator and the demodulated signal has less than 1.6 % variation of frequency.

show abstract

A Sub-1μA Low-Power FSK Modulator for Biomedical Sensor Circuits

Cited by 7 publications

References 6 publications

A high-impedance dual-mode SAW resonator for ultra low power and high data rate FSK modulator

A high-impedance dual-mode SAW resonator for ultra low power and high data rate FSK modulator

Modulation Techniques for Biomedical Implanted Devices and Their Challenges

Simple oscillators-based readout circuit for low-power biomedical implant system

Contact Info

Product

Resources

About