Title :
A 130-nm CMOS 0.007-
Ring-Oscillator-Based Self-Calibrating IR-UWB Transmitter Using an Asynchronous Logic Duty-Cycled PLL
Author :
Crepaldi, M. ; Demarchi, D.
Author_Institution :
Center for Space Human Robot., Ist. Italiano di Tecnol. at Polito, Turin, Italy
Abstract :
We present a 0.007 mm2 impulse-radio ultrawideband transmitter (TX) based on a ring oscillator capable of synthesizing pulses with both controlled center frequency and bandwidth using a single duty-cycling/trigger reference input. The TX embeds a single-phase charge-pump phase-locked loop (PLL), implemented with asynchronous logic, with 55 logic elements overall. The system, including radio frequency output buffers, consumes measured 30-45 pJ/pulse with a measured efficiency of ~ 47% at 285 MHz center frequency and Vdd in the range of 0.97-1.17 V. At 1.2V supply, the 130 nm CMOS TX tolerates ± 10% Vdd variation, maintaining robust lock and controlled power spectral density (PSD) at 300 MHz center frequency, -19 dBm radiated power at 1 MHz pulse-repetition frequency, and a fractional bandwidth of 0.23. At 300 MHz, the system achieves a measured 100 ps RMS jitter, and without output buffers, the sole PLL logic occupies an active silicon area of 0.0045 mm2.
Keywords :
CMOS integrated circuits; asynchronous circuits; digital phase locked loops; oscillators; radio transmitters; ultra wideband communication; CMOS; asynchronous logic duty-cycled PLL; frequency 1 MHz; frequency 285 MHz; frequency 300 MHz; impulse-radio ultrawideband transmitter; ring oscillator; self-calibrating IR-UWB transmitter; single duty-cycling/trigger reference input; single-phase charge-pump phase-locked loop; size 130 nm; voltage 0.97 V to 1.17 V; voltage 1.2 V; Impulse-radio ultrawideband (IR-UWB); transmitter (TX); very low complexity fast-locking phase-locked loop (PLL);
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2013.2251951