Multi-standard wideband OFDM RF-PWM transmitter in 40nm CMOS

Kulkarni, Shailesh; Kazi, Ibrahim; Seebacher, David; Singerl, Peter; Dielacher, Franz; Dehaene, Wim; Reynaert, Patrick

doi:10.1109/esscirc.2015.7313835

Cited by 16 publications

(6 citation statements)

References 10 publications

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“…The composite signals

ψ_{1, 2} false(n T_{s} false)

select the appropriate version of the carrier signal, which is then combined to generate the RF‐PWM signal. With careful layout, phase resolutions of up to 8 ps in 40 nm CMOS have been demonstrated, which can be further improved using various interpolation techniques [20].…”

Section: Digital Implementationmentioning

confidence: 99%

Power‐efficient aliasing‐free PWM transmitter

Haque

Pasha²,

Johansson³

2019

IET Circuits, Devices & Systems

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Linearity and efficiency are important parameters in determining the performance of any wireless transmitter. Pulsewidth modulation (PWM) based transmitters offer high efficiency but suffer from low linearity due to image and aliasing distortions. Although the problem of linearity can be addressed by using an aliasing-free PWM (AF-PWM), these transmitters have a lower efficiency as they can only use linear power amplifiers (PAs). Moreover, an all-digital implementation of such transmitters is not possible. The aliasing-compensated PWM transmitter (AC-PWMT) has a higher efficiency due to the use of switch-mode PAs (SMPAs) but uses outphasing to eliminate image and aliasing distortions and requires a larger silicon area. In this study, the authors propose a novel transmitter that eliminates both aliasing and image distortions while using a single SMPA. The transmitter can be implemented using all-digital techniques and achieves a higher efficiency as compared to both AF-PWM and AC-PWM based transmitters. Measurement results show an improvement of 11.3, 7.2, and 4.3 dBc in the ACLR as compared to the carrier-based PWM transmitter (C-PWMT), AF-PWMT, and AC-PWMT, respectively. The efficiency of the proposed transmitter is similar to that of C-PWMT, which is an improvement of 5% over AF-PWMT.

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“…The composite signals

ψ_{1, 2} false(n T_{s} false)

Section: Digital Implementationmentioning

confidence: 99%

Power‐efficient aliasing‐free PWM transmitter

Haque

Pasha²,

Johansson³

2019

IET Circuits, Devices & Systems

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“…Although this section is not intended to be an exhaustive review of all transmitter architectures, it is worth noting that there has been research of transmitters beyond the structures described above. One notable example is radio-frequency pulse-width modulation (RF-PWM), in which amplitude modulation is performed by altering the pulse width of the PA input signal [92][93][94][95]. It enables efficient and digital-intensive implementation, but faces the problem of needing to reproduce very narrow pulses in the PA output.…”

Section: Other Architecturesmentioning

confidence: 99%

“…The concept of the DIPM was developed as part of the broader research project related to this work, and various theoretical and practical aspects of this new type of modulator have been thoroughly discussed in publications outside the scope of this dissertation [139][140][141][142][143]. The motivation behind the DIPM is the observation that in typical digital phase modulators [29,63,64,94,95], the modulation between the harmonic components of the LO signal and the sampling images of the baseband signal creates unwanted spectral components, some of which fall on the signal band and limit the ACLR. The solution here is to use linear phase interpolation (i.e.…”

Section: Implementation Of a Multilevel Outphasing Transmittermentioning

confidence: 99%

Multilevel outphasing power amplifier system with a transmission-line power combiner

Martelius

Stadius

Lemberg

et al. 2016

2016 12th Conference on Ph.D. Research in Microelectronics and Electronics (PRIME)

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“…Recent outphasing transmitter designs have often focused on poweramplifier (PA) and power-combiner implementations while omitting the phase modulator [1,2]. Moreover, previously reported transmitters with integrated digital phase modulators have only shown bandwidths up to 40MHz [3,4], although 133MHz has been demonstrated at 10GHz carrier frequency utilizing phase modulators based on conventional IQ-DACs [5]. Thus, digital-intensive outphasing transmitters capable of modulation with hundreds of MHz bandwidth at existing cellular frequency bands have not yet been published.…”

mentioning

confidence: 99%