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A voltage-controlled varactorless LC-tank oscillator with a transformer-feedback technique

✍ Scribed by Ching-Yuan Yang; Meng-Ting Tsai

Publisher: John Wiley and Sons
Year: 2007
Tongue: English
Weight: 245 KB
Volume: 49
Category: Article
ISSN: 0895-2477
DOI: 10.1002/mop.22861

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✦ Synopsis

Abstract

A differential‐voltage‐controlled LC oscillator employs a g~m~‐tuned technique instead of a varactor is presented, verified, and measured. The design was demonstrated in a standard 0.18‐μm CMOS process. The oscillator can operate at the range of 4.73–5.05 GHz under a 1.8‐V supply voltage. The measured phase noise is −100.76 dBc/Hz at 100‐kHz frequency offset and −121.53 dBc/Hz at 1‐MHz frequency offset away from the 4.73‐GHz carrier with power consumption of 6.48 mW. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2808–2810, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22861

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## Abstract This article proposes a wide tuning voltage‐controlled oscillator (VCO) by employing a transformer‐based LC‐tank and is fabricated in a TSMC 0.18 μm CMOS process with 1.5 V supply voltage. We choose decoupling effect to decrease primary and secondary inductances and then decrease qualit