| 1. |
- Andreasson, Jens, et al.
(författare)
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Remote system for patient monitoring using bluetooth
- 2002
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Ingår i: Proceedings of IEEE SensorsVolume 1, Issue 1, 2002. - 0780374541 ; , s. 304-307
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The aim of this study is to design and develop a low-power wireless A/D-converter that should be easy to integrate with other technologies or infrastructures at a low cost. This transmitting unit should be able to replace many of the signal wires between biomedical sensors connecting the patient and the sampling unit or supervision equipment. The model of today is an embedded hardware solution with two processors (FPGA and Bluetooth). A twelve bit ADC with a 1 kHz-sampling rate then converts an analogue signal that simulates an ECG-signal with typical frequencies. The communication between the ADC and Bluetooth™ is serial and controlled by the FPGA. The remote PC runs a simple software that controls the Bluetooth™ and processes the received data. The results indicate that it is possible to continuously transmit an ECG-signal without loosing data.
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| 2. |
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| 3. |
- Fard, Ali, et al.
(författare)
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A Low Power Wide-Band CMOS VCO for Multi-Standard Radios
- 2004
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Ingår i: Proceedings - 2004 IEEE Radio and Wireless Conference, RAWCON. - 0780384512 ; , s. 79-82
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- This paper presents a single monolithic wide band VCO for multi-standard radios. Analysis on a differential switched capacitor circuit is performed. Its impact on phase noise and power dissipation is especially addressed. The analysis is demonstrated and verified in a fully integrated CMOS VCO that consumes 2.7 mA from a 1.8 V supply and operates with a wide frequency band from 3.5 - 5.3 GHz. The measured phase noise is less than -110 dBc/Hz at 1 MHz offset within the entire tuning range.
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| 4. |
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| 5. |
- Fard, Ali, et al.
(författare)
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Design of a dual-band 5/2.4 GHZ CMOS VCO for 802.11 A/B/G WLAN transceivers
- 2004
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Ingår i: IEEE Asia-Pacific Conference on Circuits and Systems, Proceedings, APCCAS, Volume 1, 2004. - 0780386604 ; , s. 429-432
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- A dual-band CMOS VCO with a divide-by-two circuit, operating between 4.7-6.2/2.35-3.1 GHz is demonstrated in a 0.35mum process. The VCO phase noise is reduced by matching the transconductance and impedance of the active devices. By using a divide-by-two stage quadrature signals for the 802.11 b/g standards are obtained. The VCO is optimized for low phase noise and small amplitude variations across the tuning range. The phase noise levels are less than -116.5 and -126 dBc/Hz at 1 MHz offset in the upper and lower frequency band respectively.
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| 6. |
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| 7. |
- Johnson, Tord, et al.
(författare)
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An Improved Phase-Frequency Detector with Extended Frequency Capability
- 2004
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Ingår i: Midwest Symposium on Circuits and SystemsVolume 1, 2004. - 078038346X ; , s. 181-184
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- An improved high-performance dynamic-logic tri-state phase-frequency detector architecture is derived through extensive time domain analysis. In particular, the impact of the reset time's on the maximum operating frequency and phase characteristics of the phase-frequency detector is discussed. The analysis is verified for the presented improved architecture and excellent agreement between theory and simulation is observed. The phase-frequency detector architecture is proven to function for supply voltages below 1 V and has an increased frequency capability of more than 20% with a power consumption of 10 μW at 500 MHz input frequency.
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