CMOS Saturated Power Amplifier With Dynamic Auxiliary Circuits for Optimized Envelope Tracking

Jin, Sangsu; Moon, Kibong; Park, Byungjoon; Kim, Jooseung; Cho, Yunsung; Jin, Hyun-Tak; Kim, Dong–Su; Kwon, Myeongju; Kim, Bumman

doi:10.1109/tmtt.2014.2364584

Cited by 23 publications

(9 citation statements)

References 50 publications

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“…The properties of voicing contrasts in American English obstruents, discussed above, can also be understood in this way. Some cues to the voicing contrast, such as vowel duration, closure duration, and glottalization (Denes 1955;Lisker 1986;Chong & Garellek 2018), are phonetically distinct from the cues to obstruent voicing but are nonetheless explainable by the articulatory and perceptual facts associated with the voicing contrast. It is not clear how an approach like that of Boersma (1998) applies to these cases, in which additional phonetic cues to a contrast can clearly be argued to enhance the percept of a contrastive feature, but this enhancement does not fall neatly along a given unidimensional perceptual continuum, like F2, that can be set at minimum or maximum.…”

Section: And Riestenbergmentioning

confidence: 99%

Context-dependent phonetic enhancement of a phonation contrast in San Pablo Macuiltianguis Zapotec

Barzilai

Riestenberg

2021

Glossa: A Journal of General Linguistics

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This paper presents novel data from San Pablo Macuiltianguis Zapotec, a Sierra Juárez variety spoken in Oaxaca, Mexico. This language is 'laryngeally complex' (Silverman, 1997), exhibiting both contrastive tone and contrastive phonation. We examine the acoustic properties of the modal and checked vowels in this language, showing that this contrast is variably produced with several different acoustic cues. We analyze the distribution of these cues as an instance of phonetic enhancement and further show that the prosodic position of a given vowel determines which of several enhancement patterns is used. We argue that extant theories of phonetic enhancement, while able to explain the patterns described here, fall short of predicting the distribution of enhancing cues. We therefore propose that future models of phonetic enhancement could be expanded to predict patterns in which more than one acoustic dimension is available for phonetic enhancement.

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Section: And Riestenbergmentioning

confidence: 99%

Context-dependent phonetic enhancement of a phonation contrast in San Pablo Macuiltianguis Zapotec

Barzilai

Riestenberg

2021

Glossa: A Journal of General Linguistics

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“…Various techniques, including supply modulation techniques, have been proposed to improve the PA efficiency at the large OPBO . The envelope tracking (ET) technique is a type of the supply modulation technique and has been used to improve the PA efficiency using the supply modulator that supplies the processed envelope signal to the PAs as the supply voltage [8][9][10][11][12][13][14][15][16][17][18][19][20]. The basic structure of the hybrid supply modulator for the ET technique consists of the high-speed linear amplifier stage and the high-efficiency switching amplifier stage.…”

Section: Introductionmentioning

confidence: 99%

DSS modulator using the SIDO dc−dc converter for the CMOS RF PA integrated circuit

Bae

et al. 2019

IET Microwaves, Antennas & Propagation

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A dynamic supply switching (DSS) modulator using a single‐inductor dual‐output (SIDO) dc−dc converter for complimentary metal‐oxide semiconductor (CMOS) radio frequency (RF) power amplifier (PA) integrated circuits is presented. The DSS modulator consists of the SIDO dc−dc converter and a supply switching circuit (SSC). The SIDO dc−dc converter requires only one off‐chip inductor while generating two of the dc voltages. The SSC dynamically switches the high and low dc voltages according to the modulated signal envelope. The supply switching control voltage, which is generated from the envelope, is optimised for maximum efficiency improvement. The proposed DSS PA using the SIDO dc−dc converter and the SSC was fabricated using a 0.18 μm CMOS process for a 1.75 GHz frequency band and a long‐term evolution (LTE) application. For the LTE 16‐QAM signal with the peak‐to‐average power ratio (PAPR) of 7.5 dB, the measured efficiency of the DSS PA is 33.8% at the average output power of 21 dBm, thereby satisfying the adjacent channel leakage power ratio (ACLR) level of −30.1 dBc. The measured efficiency of the DSS PA at an average output power of 15 dBm is 24.8%, which is higher than that of the stand‐alone PA by 13.3%.

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“…However, the performance of the CMOS PA is inferior to that of the GaAs based PA. For an improved performance to satisfy the commercial specification of the handheld application, this letter proposes adaptive ET-based circuits at the all bias nodes of the CMOS PA. Also, to adopt the ET techniques to the CMOS PA, several implementation issues are discussed. Previous work [4] addressed the gain variation under the ET operation using a dynamic bias control at the gate, while the envelope injection is not applied due to the different control profiles.…”

Section: Introductionmentioning

confidence: 99%

A Highly Efficient CMOS Envelope Tracking Power Amplifier Using All Bias Node Controls

Jin

Park

Moon

et al. 2015

IEEE Microw. Wireless Compon. Lett.

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This letter presents a highly efficient CMOS power amplifier (PA) with adaptive envelope-tracking (ET) techniques. The linearity and efficiency of the PA are improved by ET-based techniques at the gate of the common-gate (CG), the gate of the common-source (CS), and the drain of the CG. The proposed CMOS ET PA is fabricated using a 0.18 CMOS technology with a printed circuit board (PCB) transformer which has a lower insertion loss than CMOS one. Without any help of additional resources, the CMOS PA delivers an average output power of 27.5 dBm with a power-added efficiency (PAE) of 42.5%, an error vector magnitude (EVM) of 2.5%, and an of 36.5 dBc at 1.85 GHz for a long term evolution (LTE) signal with a bandwidth of 10 MHz and 7.5 dB peak-to-average power ratio (PAPR).

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CMOS Saturated Power Amplifier With Dynamic Auxiliary Circuits for Optimized Envelope Tracking

Cited by 23 publications

References 50 publications

Context-dependent phonetic enhancement of a phonation contrast in San Pablo Macuiltianguis Zapotec

Context-dependent phonetic enhancement of a phonation contrast in San Pablo Macuiltianguis Zapotec

DSS modulator using the SIDO dc−dc converter for the CMOS RF PA integrated circuit

A Highly Efficient CMOS Envelope Tracking Power Amplifier Using All Bias Node Controls

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