A Low-Power Fullband 802.11a/b/g WLAN Transceiver With On-Chip PA

Chen, Tzung-Ming; Chiu, Yung-Ming; Wang, Chuncheng; Chan, Ka-Un; Lin, Ying-Hsi; Huang, Ming-Chong; Lu, Chao-Hua; Wang, Wen-Shan; Hu, Che-Sheng; Lee, Chao-Cheng; Huang, Jiun-Zen; Chang, Bin-I; Yen, Shih-Chieh; Lin, Ying-Yao

doi:10.1109/jssc.2007.894303

Cited by 33 publications

(11 citation statements)

References 11 publications

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“…Since the maximum transmit PAPR increases as the number of tones increases, the multi-tone signal with large Q is more 5 Note that the conventional data modulation schemes such as OFDM with QAM or PSK requires the I/Q based detection and FFT processing, which consume high circuit power for ID (typically from several mW to several hundreds of mW [39], [40]). So it is hard to assure the self-powering of lowpower IoT devices with such modulation due to high-power consumption.…”

Section: Resultsmentioning

confidence: 99%

Unified Simultaneous Wireless Information and Power Transfer for IoT: Signaling and Architecture with Deep Learning Adaptive Control

Moon¹,

Jang²,

Kim³

2021

Preprint

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In this paper, we propose a unified SWIPT signal and its architecture design in order to take advantage of both single tone and multi-tone signaling by adjusting only the power allocation ratio of a unified signal. For this, we design a novel unified and integrated receiver architecture for the proposed unified SWIPT signaling, which consumes low power with an envelope detection. To relieve the computational complexity of the receiver, we propose an adaptive control algorithm by which the transmitter adjusts the communication mode through temporal convolutional network (TCN) based asymmetric processing. To this end, the transmitter optimizes the modulation index and power allocation ratio in short-term scale while updating the mode switching threshold in long-term scale. We demonstrate that the proposed unified SWIPT system improves the achievable rate under the self-powering condition of low-power IoT devices. Consequently it is foreseen to effectively deploy low-power IoT networks that concurrently supply both information and energy wirelessly to the devices by using the proposed unified SWIPT and adaptive control algorithm in place at the transmitter side.

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Section: Resultsmentioning

confidence: 99%

Unified Simultaneous Wireless Information and Power Transfer for IoT: Signaling and Architecture with Deep Learning Adaptive Control

Moon¹,

Jang²,

Kim³

2021

Preprint

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“…Here we discuss the Quality Factor regarding the trim-capacitor cells. Figure 2(a) show a trim-capacitor cell/element implemented with two n-MOS transistors [2,4] suitable for VCOs operating in the multi GHz frequency range [5]. This arrangement is suitable for very high frequency VCOs given its simplicity which reduces parasitics to a minimum.…”

Section: Vco With Trim-capacitor Cellsmentioning

confidence: 99%

“…Frequency tuning range extension can be achieved by using tapped inductors switching techniques [10], by using trim-capacitor cells [8,9,15], by using various LC VCOs [13], or a combination of the last two techniques [5]. Using trim-capacitor cells is usually an attractive solution given its relatively small area.…”

Section: Introductionmentioning

confidence: 99%

Extending the Frequency Tuning Range of VCOs Using Varactor Arrays: Design Guidelines

Moura

2011

Circuits Syst Signal Process

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Trim-capacitor cells implemented with MOS varactors are a simple means of extending the frequency tuning range of LC-VCOs in Integrated Circuit design. However, the decrease of the Quality Factor for a large number of trim-capacitor cells can reduce this extension and can also prevent the start-up of the VCO. Thus, in this paper we derive simple and effective design guidelines which allow us to estimate the maximum number of trim-capacitor cells for a required Quality Factor.

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“…A larger transistor size in the divider is commonly determined to diminish current mismatch. Moreover, calibration techniques [19][20][21][22] such as pre-distortion or postdistortion are also supposed to be implemented in a transmitter chain to eliminate the sideband signal. The current mode logic (CML) divide-by-2 circuit with I/Q phase calibration mechanism, is therefore proposed to obtain the precise quadrature signals, as shown in Fig.…”

Section: I/q Dividermentioning

confidence: 99%

A calibrated direct conversion front-end transmitter with resonant matching techniques for mobile WiMAX/WiBro applications

Chang

Jou

2011

Analog Integr Circ Sig Process

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A direct conversion front-end transmitter with the properties of high linearity and high single sideband rejection ratio is described in this paper. The transmitter employs two resonant matching techniques to improve its operating bandwidth. The first resonant circuit design is applied at the inter-stage of the LO input buffer in order to achieve a wideband frequency response which ranges from dc to 6 GHz. The second resonant circuit is applied at the power amplifier (PA) driver output stage to increase the matching bandwidth and meet both the Worldwide Interoperability for Microwave Access (WiMAX) and Wireless Broadband (WiBro) applications simultaneously. In addition, the sideband signal and carrier leakage of this transmitter are further minimized by a proposed calibration circuit design to achieve the error vector magnitude (EVM) specifications. The measured single sideband performance with calibration mechanism demonstrates approximately 15 dB improvement on sideband and carrier suppression. The rejected sideband and carrier signals can be up to 55.19 and 56.31 dBc, respectively. The measured dynamic gain range of the transmitter is 53 dB in 1-dB step with a maximum relative gain error lower than 0.4 dB. The transmitter delivers ?0.766 dBm output power with EVM of -34.687 dB for the orthogonal frequency division multiple access (OFDMA) 64QAM-3/4 modulated signals. The measured constellation is minimized to be\1.5% with output power from -2.3 to -36.2 dBm.

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A Low-Power Fullband 802.11a/b/g WLAN Transceiver With On-Chip PA

Cited by 33 publications

References 11 publications

Unified Simultaneous Wireless Information and Power Transfer for IoT: Signaling and Architecture with Deep Learning Adaptive Control

Unified Simultaneous Wireless Information and Power Transfer for IoT: Signaling and Architecture with Deep Learning Adaptive Control

Extending the Frequency Tuning Range of VCOs Using Varactor Arrays: Design Guidelines

A calibrated direct conversion front-end transmitter with resonant matching techniques for mobile WiMAX/WiBro applications

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