Abstract
This paper describes a 4.48 GHz–5.89 GHz LC voltage-controlled oscillator (LC-VCO) as a key component in RF transceivers. The circuit is fully designed in TSMC’s 65 nm radio-frequency complimentary metal-oxide-semiconductor technology process. The LC-VCO uses the structure of only one couple of NMOS differential negative resistances, tank circuit which consists of an optimal on-chip spiral inductor with switched capacitor and varactor arrays. The proposed design accomplishes wide tuning range frequency by using 6-bit switch capacitor array in addition to linearly varying MOS varactors. A switched current source block is used to improve the performance of the LC-VCO. The oscillator has a wide tuning range, between 4.48 GHz and 5.89 GHz. The LC-VCO dissipates 15.96 mW from a voltage supply of 1.8 V, whereas its phase noise is -124.1 dBc/Hz at 1 MHz offset of a at 5.89 GHz carrier. DOI: http://dx.doi.org/10.5755/j01.eee.20.2.6383
Highlights
Over time, when wireless technology is improving so rapidly, more and more attention is appointed to high performance, low cost, low power, small area transceivers
This transceiver consists of the following blocks: low noise amplifier (LNA), power amplifier (PA), downconversion mixer, up-conversion mixer, filters and frequency synthesizer
The layout of the proposed LC voltage-controlled oscillator (LC-voltage-controlled oscillator (VCO)) is designed in accordance with the symmetry
Summary
Over time, when wireless technology is improving so rapidly, more and more attention is appointed to high performance, low cost, low power, small area transceivers. The Ring-VCOs take a small area on a chip and can provide very wide tuning range but their phase noise performance is very poor when compared to LC-VCOs. LCVCOs can operate in high frequency, but their tuning range is relatively small and on-chip inductors occupy a lot of chip area [1]–[5].
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