2.4-GHz frequency synthesizer with open loop FSK modulator for WPAN applications

Rahajandraibe, W.; Zaid, L.; Beaupre, V.C. de; Bas, G.

doi:10.1109/newcas.2007.4488025

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…In a transmitter, GFSK signals can be generated by various methods, such as the direct quadrature up-conversion of I/Q signals [1], [3], [9]- [11], the close-loop VCO modulation [12]- [18], and the open-loop VCO modulation [19]- [21]. The direct quadrature up-conversion is the most complex and power-hungry approach and, therefore, is not used in this paper.…”

Section: B Transmitter Architecturementioning

confidence: 99%

“…However, a fractional-N PLL is required, increasing the circuit complexity and cost. Furthermore, a problem needs to be coped with is the mismatch between tuning gains of two modulation paths, which also complicates circuit designs [21]. The implementation of an open-loop VCO modulation is usually simpler and more efficient in power consumption.…”

Section: B Transmitter Architecturementioning

confidence: 99%

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A Low-Power 2.4-GHz CMOS GFSK Transceiver With a Digital Demodulator Using Time-to-Digital Conversion

Chen¹,

Yang²,

Huang³

et al. 2009

IEEE Trans. Circuits Syst. I

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A technique of time-to-digital conversion is utilized in a digital demodulator for a low-power 2.4-GHz CMOS GFSK transceiver. The proposed time-to-digital converter (TDC) employs a self-sampling technique and an auto-calibration algorithm to avoid edge synchronization problems and the need of a delay-locked loop (DLL). With the TDC, a limiter and a digital demodulator can be employed simultaneously in the receiver to achieve low power consumption and high performance. Additionally, in the transmitter, the open-loop VCO modulation is adopted to save hardware and power consumption. The transmitter frequency drift in open-loop modulation and frequency offset between the receiver and the transmitter can be easily resolved by the proposed receiver architecture. All required building blocks of the proposed transceiver, except a RF matching network and a crystal, were implemented on a 4-mm 2 chip by a 0.18-m CMOS process. The receiver achieves 89-dBm sensitivity at 0.1% BER with 1-Mb/s data rate, and the transmitter delivers up to 0-dBm output power. The receiver and transmitter consume 13.3 mA and 10.7 mA, respectively, from a 1.8-V power supply. Index Terms-Complex bandpass filter, demodulator, frequency synthesizer, low-noise amplifier (LNA), open-loop VCO modulation, time-to-digital converter (TDC).

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Section: B Transmitter Architecturementioning

confidence: 99%

Section: B Transmitter Architecturementioning

confidence: 99%

A Low-Power 2.4-GHz CMOS GFSK Transceiver With a Digital Demodulator Using Time-to-Digital Conversion

Chen¹,

Yang²,

Huang³

et al. 2009

IEEE Trans. Circuits Syst. I

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“…Frequency-shift-keying (FSK) scheme is widely used in the transmitter as it is a constant envelope form of digital modulation. Usually a frequency synthesizer is employed in the FSK modulator to modulate the VCO directly as reported in many publications [7,8].…”

Section: Introductionmentioning

confidence: 99%

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

Zhu

Islam

Haider

et al. 2012

Analog Integr Circ Sig Process

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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.

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Design of novel digital GFSK modulation and demodulation system for short-range wireless communication application

Long¹,

Zheng²,

Jiang³

et al. 2016

2016 IEEE International Conference on Electron Devices and Solid-State Circuits (EDSSC)

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2.4-GHz frequency synthesizer with open loop FSK modulator for WPAN applications

Cited by 4 publications

References 3 publications

A Low-Power 2.4-GHz CMOS GFSK Transceiver With a Digital Demodulator Using Time-to-Digital Conversion

A Low-Power 2.4-GHz CMOS GFSK Transceiver With a Digital Demodulator Using Time-to-Digital Conversion

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

Design of novel digital GFSK modulation and demodulation system for short-range wireless communication application

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