Automatic amplitude control loop for a 2-V, 2.5-GHz LC-tank VCO

Author

Zanchi, A. ; Bonfanti, Andrea ; Levantino, Salvatore ; Samori, Carlo ; Lacaita, Andrea L.

Author_Institution

Texas Instrum. Inc., Dallas, TX, USA

fYear

2001

fDate

9-9 May 2001

Firstpage

209

Lastpage

212

Abstract

The paper discusses the design of the automatic amplitude control circuit (AAC) for wireless-targeted oscillators, presenting a 2-V, 2.5-GHz LC-tank bipolar VCO. Potential phase noise degradation due to the amplitude loop is illustrated, along with design choices to avoid this effect. The circuit manufactured draws 7 mA in the VCO and less than 600 μA in the AAC, with SSCR=-104 dBc/Hz@100 kHz. Once normalized for power, Q-factor and operating frequency, this phase noise performance ranks first among the bipolar VCOs published so far.

Keywords

MMIC oscillators; Q-factor; UHF integrated circuits; UHF oscillators; bipolar MMIC; low-power electronics; phase noise; voltage-controlled oscillators; 2 V; 2.5 GHz; 600 muA; 7 mA; LC-tank VCO; Q-factor; amplitude loop; automatic amplitude control loop; bipolar VCO; operating frequency; phase noise degradation; wireless-targeted oscillators; Automatic control; Circuit noise; Degradation; Frequency; Integrated circuit modeling; Phase noise; Q factor; Transceivers; Transconductors; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Custom Integrated Circuits, 2001, IEEE Conference on.

Conference_Location

San Diego, CA

Print_ISBN

0-7803-6591-7

Type

conf

DOI

10.1109/CICC.2001.929757

Filename

929757