A continuous-time IR-UWB RAKE receiver for coherent symbol detection

Sudalaiyandi, Shanthi; Lande, Tor Sverre

doi:10.1109/norchp.2012.6403098

Cited by 1 publication

(3 citation statements)

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“…10(c); the peak-to-peak value and the standard deviation are 260 and 44 ps, respectively. This jitter may be tolerated provided that processing gain is utilized [7]. The measured locking range (LR) with the minimum input power (−17.5 dBm) is approximately 260 MHz (800-1060 MHz).…”

Section: Resultsmentioning

confidence: 99%

“…Combining IR-UWB technology with long symbols provides a large number of tags with acceptable interference. Precise localization is feasible with elaborate receiver design [7]. A proof-of-concept prototype has been successfully implemented in a TSMC 90-nm CMOS process.…”

Section: Discussionmentioning

confidence: 99%

“…power-management schemes and additional control circuits could be used to avoid the capacitor discharging; however, this may increase the power consumption of the PMU and degrade the sensitivity. The coherent UWB rake receiver (an example structure can be found in [7]) inside the reader continuously monitors incoming signals and compares them with the stored symbols using cross correlation. The operations are repeated until a sufficient SNR is achieved to detect the tags and the reader stops the energy supply.…”

Section: A Top Systemmentioning

confidence: 99%

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A Wireless-Powered IR-UWB Transmitter for Long-Range Passive RFID Tags in 90-nm CMOS

Lee

Lande

2014

IEEE Trans. Circuits Syst. II

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An impulse radio ultrawideband (IR-UWB) transmitter (TX) intended for long-range passive radio-frequency (RF) identification tags is presented. It is wirelessly powered by an ultrahigh-frequency (UHF) signal. A 128-bit pseudonoise code is transmitted when enough energy is harvested. A new on-off-keying multicycle energy-efficient IR-UWB pulse generator (PG) is proposed, and a co-design with power management circuits is introduced to improve the system supply noise performance. A novel injection-locking divider co-designed with an RF voltage rectifier is proposed to eliminate the injection input resistive load that exists in some designs; otherwise, the input sensitivity would be degraded. A proof-of-concept prototype is fabricated in a TSMC 90-nm CMOS process. Measurements show the TX input sensitivity to be approximately −17.5 dBm with a 900-MHz UHF input. The measured PG output swing is 195 mV p−p with a −10 dB bandwidth of approximately 3.4 GHz.Index Terms-Co-design, injection-locking frequency divider (ILD), pulse generator (PG), radio-frequency identification (RFID) tag, transmitter (TX), ultrawideband (UWB), wirelesspowered.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: A Top Systemmentioning

confidence: 99%

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