An EER Transmitter Architecture with Burst-Width Envelope Modulation based on Triangle-Wave Comparison PWM

Takeuchi, Makoto; Ando, Nobuhiko; Kodera, Toshiro; Yano, Kenji

doi:10.1109/pimrc.2007.4394620

Cited by 28 publications

(7 citation statements)

References 9 publications

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“…By expanding (3), it can be shown that (22) By expanding the last term (23) The latter part of the second term in the previous equation can be rewritten as (24) since is an integer. Therefore, (23) can be simplified as (25) Assume (26) (29) it can be shown that (27) By substituting back into (27) …”

Section: Appendixmentioning

confidence: 99%

A Polar-Transmitter Architecture Using Multiphase Pulsewidth Modulation

Chen

Yang²,

Lin

et al. 2011

IEEE Trans. Circuits Syst. I

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This paper presents a transmitter architecture based on a pulse-modulated polar transmitter using multiphase pulsewidth modulation. The modulation to the radio-frequency input signal, instead of conventional drain modulation, significantly reduces the circuit complexity, while the multiphase modulation technique reduces the out-of-band emissions. An 836.5-MHz four-phase prototype transmitter using four class-C power amplifiers in parallel was constructed. Using the transmitter, single-phase, two-phase, and four-phase pulsewidth modulated signals were tested to verify the benefits of using the proposed multiphase architecture. Using a CDMA2000 1X signal, 46.8% efficiency at a 29-dBm output power level was measured while passing the spectral-mask requirements without using any kind of digital predistortion or calibration.

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Section: Appendixmentioning

confidence: 99%

A Polar-Transmitter Architecture Using Multiphase Pulsewidth Modulation

Chen

Yang²,

Lin

et al. 2011

IEEE Trans. Circuits Syst. I

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“…In order not to degrade efficiency too much, those bursts should be long enough [5], [10], [11]. As a rule of thumb, f c /f s should be at least 10 in any operating mode.…”

Section: Operating Modes and System Parametersmentioning

confidence: 99%

“…If the sinusoidal carrier is replaced by a square wave, a phasemodulated carrier (PMC) can easily be amplified using a switching PA. Using oversampling techniques such as pulse width modulation (PWM) or ∆Σ, it is possible to modulate the amplitude information also into a two-or three-level signal by switching the PMC on and off [2], [4], [5]. This removes the need for a DAC and a linear baseband PA on the amplitude path.…”

Section: Introductionmentioning

confidence: 99%

A fully digital delay-line based GHz-range multimode transmitter front-end in 65-nm CMOS

Nuyts

Singerl

Dielacher

et al. 2011

2011 Proceedings of the ESSCIRC (ESSCIRC)

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A fully digital up-converter for wireless transmission in the GHz range is presented. The system consists of a polar modulator which uses PWM for the amplitude modulator (AM). Phase modulation (PM) is implemented by shifting the carrier in time. Both the PWM and the PM are implemented using asynchronous delay lines which allow time resolutions down to 10 ps without the need for high-frequent clock signals. The system is designed to drive two class-E power amplifiers with a power combiner. It supports a continuous range of carrier frequencies starting at 946 MHz and limited upwards only by the desired resolution. The modulator has been implemented in 65-nm CMOS. Results show error vector magnitude (EVM) values between 1.24% (-38.1 dB) at 946 MHz and 3.98% (-28.0 dB) at 2.4 GHz for 64-QAM OFDM signals.

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“…Among these techniques, Kahn Envelope Elimination and Restoration (EER) (Kahn, 1952) is recently being studied well and its applicability is shown for microwave transmitters (Raab et al, 2002) and the IEEE 802.11a/g wireless LAN systems using QAM with OFDM (Diet et al, 2004). Furthermore for better linearity and efficiency, direct RF modulation techniques by the PWM pulses digitized from the envelope signal have been studied for these ten years (Adachi et al, 2002;Wang, 2003;Taromaru et al, 2007;Yokozawa and Yamao, 2011). This transmitter architecture is called envelope delta-sigma modulation (EDSM) (Dupuy and Wang, 2004), or envelope pulse width modulation (EPWM) (Yokozawa and Yamao, 2011;Takahashi and Yamao, 2010).…”

Section: Introductionmentioning

confidence: 99%

A Study on Drain Efficiency of Edsm/Epwm Transmitter Using Class-E Amplifier

Takeuchi¹

2012

Proceedings of the First International Conference on Telecommunications and Remote Sensing

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Drain efficiency of EPWM (envelope pulse width modulation) transmitter composed of a class-E amplifier is evaluated by circuit simulation, and the pulse modulation method to the constant envelope RF signal by PWM pulses is studied. The class-E amplifier is designed as normal for continuous wave (CW) and constant envelope signals. Each transistor is modeled with an ideal switch and an on-resistor, where the drain-source capacitance is modeled as a linear one together with the shunt capacitor. Simulation results show that the conventional PWM switching method gating the input RF signal produces unnecessary transient responses making the drain voltage rise and the output signal distorted; the efficiency is degraded. Another method that gates the DC supply voltage by the PWM pulses works as expected and intended, and the result shows the drain efficiency is as high as that of a class-E amplifier driven with a CW signal.

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An EER Transmitter Architecture with Burst-Width Envelope Modulation based on Triangle-Wave Comparison PWM

Cited by 28 publications

References 9 publications

A Polar-Transmitter Architecture Using Multiphase Pulsewidth Modulation

A Polar-Transmitter Architecture Using Multiphase Pulsewidth Modulation

A fully digital delay-line based GHz-range multimode transmitter front-end in 65-nm CMOS

A Study on Drain Efficiency of Edsm/Epwm Transmitter Using Class-E Amplifier

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