Title :
A low-noise, low-power VCO with automatic amplitude control for wireless applications
Author :
Margarit, Mihai A. ; Tham, Joo Leong ; Meyer, Robert G. ; Deen, M. Jamal
Author_Institution :
Rockwell Semicond. Syst., Newport Beach, CA, USA
fDate :
6/1/1999 12:00:00 AM
Abstract :
Voltage controlled oscillators (VCOs) used in portable wireless communications applications, such as cellular telephony, are required to achieve low phase-noise levels while consuming minimal power. This paper presents the design challenges of a VCO with automatic amplitude control, which operates in the 300 MHz to 1.2 GHz frequency range using different external resonators. The VCO phase noise level is -106 dBc/Hz at 100-KHz offset from an 800-MHz carrier, and it consumes 1.6 mA from a 2.7-V power supply. An extensive phase-noise analysis is employed for this VCO design in order to identify the most important noise sources in the circuit and to find the optimum tradeoff between noise performance and power consumption
Keywords :
MMIC oscillators; UHF oscillators; cellular radio; low-power electronics; phase noise; voltage-controlled oscillators; 1.6 mA; 2.7 V; 300 MHz to 1.2 GHz; automatic amplitude control; cellular telephony; external resonators; low-power VCO; noise performance; noise sources; phase-noise levels; portable wireless communications applications; power consumption; Automatic control; Circuit noise; Communication system control; Frequency; Performance analysis; Phase noise; Power supplies; Telephony; Voltage-controlled oscillators; Wireless communication;
Journal_Title :
Solid-State Circuits, IEEE Journal of
