Pulse generation scheme for low-power low-complexity impulse ultra-wideband

Chen, X.; Kiaei, S.

doi:10.1049/el:20073239

Cited by 5 publications

(5 citation statements)

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“…Unfortunately, static CMOS-based pulse generation has significant DC content that is difficult to remove via pulse shaping alone, making spectral compliance challenging. Previous work has relied on baluns [10] or off-chip filters [8], [14] to remove this low-frequency content and achieve spectral compliance. This typically requires significant chip or board area, thus increasing the size and cost of the wireless node.…”

Section: An Energy-efficient All-digital Uwb Transmittermentioning

confidence: 99%

An Energy-Efficient All-Digital UWB Transmitter Employing Dual Capacitively-Coupled Pulse-Shaping Drivers

Mercier

Daly

Chandrakasan

2009

IEEE J. Solid-State Circuits

116

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This paper presents an all-digital, non-coherent, pulsed-UWB transmitter. By exploiting relaxed center frequency tolerances in non-coherent wideband communication, the transmitter synthesizes UWB pulses from an energy-efficient, single-ended digital ring oscillator. Dual capacitively coupled digital power amplifiers (PAs) are used in tandem to attenuate low frequency content typically associated with single-ended digital circuits driving single-ended antennas. Furthermore, four level digital pulse shaping is employed to attenuate RF sidelobes, resulting in FCC compliant operation in the 3.5, 4.0, and 4.5 GHz IEEE 802.15.4a bands without the use of any off-chip filters or large passive components. The transmitter is fabricated in a 90 nm CMOS process and occupies a core area of 0.07 mm 2. The entirely digital architecture consumes zero static bias current, resulting in an energy efficiency of 17.5 pJ/pulse at data rates up to 15.6 Mb/s.

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Section: An Energy-efficient All-digital Uwb Transmittermentioning

confidence: 99%

An Energy-Efficient All-Digital UWB Transmitter Employing Dual Capacitively-Coupled Pulse-Shaping Drivers

Mercier

Daly

Chandrakasan

2009

IEEE J. Solid-State Circuits

116

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“…An additional drive amplifier for driving 50‐Ω output loads generally consumes a large amount of power because of the static current [4, 6–14, 20, 21]. Although the static current can be reduced by switching the drive amplifier on/off, doing so causes unwanted signal distortions at the rising and falling edges of the switch signal [8, 11].…”

Section: Proposed Gaussian Pulse Generatormentioning

confidence: 99%

“…A Gaussian pulse can achieve a sidelobe rejection of more than 30 dB [3,4]. Therefore, a digital pulse generator requires an additional band-pass filter for pulse shaping to meet the FCC spectrum mask [5][6][7][8][9][10] and a large chip area for LC filters. However, Gaussian pulse-shaping circuits without a band-pass filter have been reported [4,[11][12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

CMOS impulse radio ultra‐wideband Gaussian pulse generator with variable channel and bandwidth

Choi

Kwon

2016

IET Circuits, Devices & Systems

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A Gaussian pulse generator for an ultra-wideband impulse radio transmitter is presented. The proposed generator is based on digital intensive circuits, and the centre frequency and bandwidth of a pulse are controlled by a digitally tunable delay circuit and pulse-width control circuit. The Gaussian pulse is obtained by a weighted summing amplifier that is controlled by a digital switching signal without an additional LC filter. The amplifier uses a Gaussian pulse shaper that has tunable weighting factors with bandwidth control. The energy consumption of the pulse generator is 37.4 pJ/pulse, and sidelobe rejection of 20 dB is achieved without a filter.

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“…While the application space requires of very low-data-rates of ~ 100 Kbps [9], maintaining energy efficiency (per bit) at these levels is important to keep the power At the same time, transmitter designs must meet the FCC spectral mask, which requires pulse-shaping to optimally utilize transmission in the mandated band. Due to on-board real-estate requirements, use of external filters to meet the FCC mask [7,10,11], is undesirable. Pulse-shaping is also important for better inter-band isolation and side-lobe rejection as well as improved spectral efficiency.…”

Section: Transmitter Designmentioning

confidence: 99%

“…3.33), which detects the arrival of the pulse, effectively serving as an asynchronous self-timed one-bit ADC. The detector uses a regenerative latch and is biased such that M 1,2 are nominally in sub-threshold and that the positive feedback through inverter pairs M 9,10 and M 11,12 is suppressed by the presence of damping transistors M 7,8 , providing a net negative feedback that holds both outputs close to the supply voltage VDD. However, in the presence of a pulsed signal, the total current through M 1,2 rises exponentially, causing positive feedback to increase and driving either the PD_Out + or PD_Out-outputs low.…”

Section: Peak-detection Based Self-timed Pulse-detectionmentioning

confidence: 99%