Gaussian pulse approximation using standard CMOS and its application for sub‐GHz UWB impulse radio

Zhang, Xiaodong; El-Gamel, Mohamed; Bayoumi, Magdy

doi:10.1002/cta.571

Cited by 7 publications

(5 citation statements)

References 67 publications

(69 reference statements)

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“…UWB impulse radio (UWB-IR) transmits information through short nanoseconds baseband pulses without employing a carrier, leading to advantages such as low complexity, and low power consumption [28,29]. To generate a UWB pulse, a number of methods are available.…”

Section: B Uwb Pulse Shapingmentioning

confidence: 99%

System-Level Design of a Full-Duplex Wireless Transceiver for Brain–Machine Interfaces

Bahrami

Mirbozorgi

Nguyen

et al. 2016

IEEE Trans. Microwave Theory Techn.

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Abstract-We propose a new wireless communication architecture for implanted systems that simultaneously stimulate neurons and record neural responses. This architecture can support large numbers of electrodes (>500), providing 100 Mb/s for the downlink of stimulation signals, and Gb/s for the uplink neural recordings. We propose a full-duplex transceiver architecture that shares one antenna for both ultra-wideband (UWB) and the 2.45 GHz ISM band. A new pulse shaper is used for the Gb/s uplink to simplify transceiver design, while supporting several modulation formats with high data rates. To validate our system level design for brain-machine interfaces (BMI), we present an ex-vivo experimental demonstration of the architecture. While the system design is for an integrated solution, the proof-of-concept demonstration uses discrete components. Good bit error rate performance over a biological channel at 0.5, 1, and 2 Gbps data rates for uplink telemetry (UWB) and 100 Mb/s for downlink telemetry (2.45 GHz band) are achieved.Index Terms-Neural recording and stimulating, Full-Duplex, Downlink, Uplink, Ultra-wideband (UWB), ISM, Brain machine interface.

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Section: B Uwb Pulse Shapingmentioning

confidence: 99%

System-Level Design of a Full-Duplex Wireless Transceiver for Brain–Machine Interfaces

Bahrami

Mirbozorgi

Nguyen

et al. 2016

IEEE Trans. Microwave Theory Techn.

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“…The sub-nanosecond glitch generator [39][40][41][42] shown in Figure 1 is an important component in creating the wideband signal having the required duration and shape. The pulse produced must be sharp and narrow enough (sub-nanosecond duration) to ensure high bandwidth.…”

Section: Glitch Generatormentioning

confidence: 99%

A 5‐GHz energy‐efficient tunable pulse generator for ultra‐wideband applications using a variable attenuator for pulse shaping

El-Gabaly

Saavedra

2011

Circuit Theory & Apps

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SUMMARYA new energy-efficient tunable pulse generator is presented in this paper using 0.13-mm CMOS technology for short-range high-data-rate 3.1-10.6 GHz ultra-wideband applications. A ring oscillator consisting of current-starved CMOS inverters is quickly switched on and off for the duration of the pulse, and the amplitude envelope is shaped with a variable passive CMOS attenuator. The variable passive attenuator is controlled using an impulse that is created by a low-power glitch generator (CMOS NOR gate). The glitch generator combines the falling edge of the clock and its delayed inverse, allowing the duration of the impulse to be changed over a wide range (500-900 ps) by varying the delay between the edges. The pulses generated with this technique can provide a sharp frequency roll off with high out-of-band rejection to help meet the Federal Communications Commission mask. The entire circuit operates in switched mode with a low average power consumption of less than 3.8mW at 910 MHz pulse repetition frequency or below 4.2 pJ of energy per pulse. It occupies a total area of 725Â600mm 2 including bonding pads and decoupling capacitors, and the active circuit area is only 360Â200mm 2 .

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“…Impulse radio is a particular form of signaling in which short-duration pulses are transmitted, thereby spreading the energy of the radio signal over a relatively wide bandwidth [1][2][3][4]. Super-regenerative (SR) receiver architecture, invented in 1922 by Armstrong [5], is a promising front-end solution for low-power and low-cost impulse radio communications.…”

Section: Introductionmentioning

confidence: 99%

Selectivity and sensitivity enhancement methods for high‐data‐rate super‐regenerative receiver

Mousavi

Saeedi

2017

Circuit Theory & Apps

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This paper describes selectivity and sensitivity performance evaluations and improvement methods for an on-off keying super-regenerative (SR) receiver. A slope-controlled quasi-exponential quench waveform, generated by a low-complexity PVT-tolerant quench generator circuit, is proposed to increase data rate and reduce the receiver 3-dB bandwidth, thereby preventing oscillation caused by out-of-band injected signals and improving the receiver selectivity. The SR receiver sensitivity is also enhanced by a noise-canceling front-end topology with single-ended to differential (S2D) signal converter. To exemplify these techniques, we designed an SR receiver with the proposed front-end and quench waveform generator in a 0.18-μm CMOS technology. Theoretical analyses and circuit simulations show 30% and 65% reduction in 3-dB bandwidth of the SR receiver at 25 Mbps data rate by employing the proposed quench signal compared with piecewise-linear and trapezoidal quench waveforms, respectively. Performance of the proposed front-end is evaluated by a fast bit-error-rate estimation procedure, based on circuit noise simulations and statistical analyses, without the need for time-consuming transient-noise simulations. Accuracy of the procedure has been verified by comparing its results with transient-noise simulations. According to the estimated bit-error-rate curves, the noise-canceling topology with S2D converter enhances the SR receiver sensitivity by 9 dB.The noise-canceling RF front-end with S2D conversion is shown in Figure 7. A common gate (CG)common source (CS) LNA topology is employed to provide input impedance matching and S2D conversion. Trans-conductance of the CG transistor, M 3 , is set to 20 mS for 50-Ω input impedance matching. The biasing circuit in Figure 2 is also employed in the LNA to reduce the effect of PVT variations on trans-conductance of M 3 and M 4 . Phase difference between the two signals injected by the CS transistor, M 4 , and the CG transistor, M 3 , to the SR oscillator core is about 180 degrees. The Figure 6. (a) The conductance curve, G(t); (b) the sensitivity pulse, s(t), and the normalized oscillation envelope, p(t); and (c) the super-regenerative band-pass function, |H bp (ω)|, of the proposed quench technique for three different values of G À and gain. Data rate is 25 Mbps in all cases.Figure 8. The super-regenerative oscillator output employing (a) the proposed S2D converter and (b) a single-ended LNA. (c) Histogram of the oscillator output low level, derived from Monte Carlo simulations.Figure 14. Transient-noise simulation of the super-regenerative receiver at 25 Mbps data rate: (a) the input pulse, (b) oscillator differential output, (c) envelope detector output, and (d) output signals of the comparator and the flip-flop.

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Gaussian pulse approximation using standard CMOS and its application for sub‐GHz UWB impulse radio

Cited by 7 publications

References 67 publications

System-Level Design of a Full-Duplex Wireless Transceiver for Brain–Machine Interfaces

System-Level Design of a Full-Duplex Wireless Transceiver for Brain–Machine Interfaces

A 5‐GHz energy‐efficient tunable pulse generator for ultra‐wideband applications using a variable attenuator for pulse shaping

Selectivity and sensitivity enhancement methods for high‐data‐rate super‐regenerative receiver

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