Edge-Combining for QPSK and FSK Modulation Using a Single Delay-Line

Stadelmayer, Markus; Schumacher, Tim; Faseth, Thomas; Lang, Oliver; Pretl, Harald

doi:10.1109/austrochip51129.2020.9232989

Cited by 1 publication

(3 citation statements)

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“…11. Hence, in theory the proposed approach is also suitable for QPSK modulation (see [9]). The spectral shape of the FSK-modulated signal as described in Sec.…”

Section: Measurement Resultsmentioning

confidence: 99%

“…is produced. As shown in [9], switching the signal phase periodically leads to a frequency spectrum of weighted Dirac pulses δ at an offset of f δ = κf sw ± f mod from the carrier frequency f RF [si(x) = sin(x)/x]:…”

Section: B Frequency-shift Keyingmentioning

confidence: 99%

“…In order to achieve good switching behavior of the transistors, the signals p i must be pre-amplified by differential buffers (see Fig. 7) that preserve symmetry and a duty cycle of 50% by their cross-coupled architecture in the same manner as the ring oscillator stages described in [9]. Differing from a 50% duty cycle will cause power at even number harmonic frequencies and consequently additional non linearity.…”

Section: Edge-combining Power Amplifiermentioning

confidence: 99%

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A Low-Power Edge-Combining Transmitter Using Quadrature Signals for FSK Modulation

Stadelmayer

Schumacher

Faseth

et al. 2021

2021 IEEE International Symposium on Circuits and Systems (ISCAS)

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A low-power transmitter is proposed that applies edge-combining not only for frequency multiplication but also for quadrature signal generation. A phase-selection modulator uses the quadrature signals for frequency modulation, where frequency-shift keying is emulated by switching the quadrature signals according to the desired frequency deviation. Additionally, the selection modulator can interpolate eight auxiliary phases that enhance the spectral performance of the frequency modulation. The transmitter was fabricated in a 180 nm CMOS process. The target radio frequency in the 868 MHz ISM band is generated using an efficient switched-mode edge-combining power amplifier with a drain efficiency of 24%, while the transmitter operates at a frequency of 217 MHz to reduce power consumption. This transmitter works without external components and achieves a high overall power efficiency of 5 % with an RF output power of −7 dBm and a transmitter power consumption of 3.9 mW in an area of 0.94 mm 2 .

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“…11. Hence, in theory the proposed approach is also suitable for QPSK modulation (see [9]). The spectral shape of the FSK-modulated signal as described in Sec.…”

Section: Measurement Resultsmentioning

confidence: 99%

Section: B Frequency-shift Keyingmentioning

confidence: 99%

Section: Edge-combining Power Amplifiermentioning

confidence: 99%

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