Edge-Combining for QPSK and FSK Modulation Using a Single Delay-Line
Sprache des Vortragstitels:
Deutsch
Original Tagungtitel:
Proceedings 2020 Austrochip Workshop on Microelectronics
Sprache des Tagungstitel:
Deutsch
Original Kurzfassung:
This work introduces a method to use edgecombining
to obtain Quadrature Phase Shift Keying (QPSK) as
well as Frequency Shift Keying (FSK) signals in a power efficient
way to be used in low-power integrated transmitters for Internet
of Things applications. Therefore, 16 time-delayed (phase-shifted)
signals are produced by one 8-stage differential delay line. The
signals are applied in combination with edge-combining for
both, 4-times frequency multiplication and quadrature signal
generation. Moreover, a phase selector is assigned to perform
QPSK as well as FSK by adapting the selector stepping values
according to the desired frequency deviation. In order to get
better spectral purity, additional phase values (as needed for
12-PSK) for frequency modulation are generated by additional
phase shifts. For this work, the concept is proven by simulation
and targets a phase locked ring oscillator with a constant in-band
phase noise of ?80 dBc/Hz in the loop bandwidth of 1MHz and
a out of band phase noise with a slope of ?20 dB/dec from a
carrier frequency of 864 MHz. The proposed method intends to
reduce the power demand of integrated transmitters by keeping
the frequency and amount of power-hungry components low.
Moreover, compared to other work in the area of edge-combining
transmitters, a method for complex modulation by one delay line
is introduced.
Sprache der Kurzfassung:
Deutsch
Vortragstyp:
Hauptvortrag / Eingeladener Vortrag auf einer Tagung
Forschungs-