Title :
A 700 pJ/bit, 2.4 GHz, narrowband, PLL-free burst mode transmitter based on an FBAR with 5μs startup time for highly duty-cycled systems
Author :
Thirunarayanan, Raghavasimhan ; Ruffieux, David ; Pengg, Franz ; Scolari, N. ; Persechini, P. ; Enz, Christian
Author_Institution :
EPFL, Neuchatel, Switzerland
Abstract :
This paper presents a PLL-free transmitter based on an FBAR achieving a 5μs startup time to reduce the crystal oscillator power overhead which degrades the energy efficiency for heavily duty cycled systems. The TX upconverts a FSK-modulated FBAR DCO signal with the IF output of a Phase Switching Divider (PSD) injection locked to the DCO. The PSD has a division step of 0.2 to circumvent the limited FBAR tuning range that prevents addressing all the channels in the various bands between 2.36 and 2.5 GHz. Integrated in a 65nm technology, the TX outputs -1dBm and consumes 9.2mA at 1.2V. Further, the TX is capable of data rates up to 16 Mbps leading to a peak energy efficiency of 700pJ/b as well as a multi-fold reduction in the mean power dissipation at lower mean data rates.
Keywords :
UHF oscillators; acoustic resonators; bulk acoustic wave devices; crystal oscillators; dividing circuits; frequency shift keying; injection locked oscillators; radio transmitters; switching circuits; FSK-modulated FBAR DCO signal; PSD; crystal oscillator power overhead reduction; current 9.2 mA; frequency 2.36 GHz to 2.5 GHz; highly duty-cycled systems; limited FBAR tuning range; mean power dissipation; multifold reduction; narrowband PLL-free burst mode transmitter; phase switching divider; size 65 nm; time 5 mus; voltage 1.2 V; Film bulk acoustic resonators; Frequency shift keying; Mixers; Transmitters; Tuning; FBAR; PLL-free TX; Phase Switching Divider; fast startup;
Conference_Titel :
Radio Frequency Integrated Circuits Symposium, 2014 IEEE
Conference_Location :
Tampa, FL
Print_ISBN :
978-1-4799-3862-9
DOI :
10.1109/RFIC.2014.6851648
