Title :
21.5 A 3.24-to-8.45GHz low-phase-noise mode-switching oscillator
Author :
Taghivand, Mazhareddin ; Aggarwal, Kamal ; Poon, Ada S. Y.
Author_Institution :
Stanford Univ., Stanford, CA, USA
Abstract :
VCO design for cellular applications to achieve universal coverage for a wide range of frequencies (400MHz to 3700MHz) in different standards and meeting stringent out-of-band and in-band phase-noise (PN) requirements is a challenging task. The simplest method to generate I and Q signals in the LO is to use a frequency divide-by-2 which requires the VCO frequency to be an even multiple of fLO. This method is area efficient and superior for coexistence as it does not generate jammers in other bands. The technique in this work expands the VCO frequency range to ensure 2xfLO for all cellular bands, notably 3700MHz, with sufficient margin, and meets the most stringent PN specification for a SAW-less GSM transceiver.
Keywords :
microwave oscillators; phase noise; switching circuits; voltage-controlled oscillators; SAW-less GSM transceiver; VCO frequency range; cellular application; cellular bands; frequency 3.24 GHz to 8.45 GHz; frequency 400 MHz to 3700 MHz; in-band phase-noise requirements; low-phase-noise mode-switching oscillator; out-of-band phase-noise requirements; Capacitors; Inductance; Inductors; Switches; Transistors; Voltage-controlled oscillators;
Conference_Titel :
Solid-State Circuits Conference Digest of Technical Papers (ISSCC), 2014 IEEE International
Conference_Location :
San Francisco, CA
Print_ISBN :
978-1-4799-0918-6
DOI :
10.1109/ISSCC.2014.6757473