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Analysis of Two Filtering Techniques in Differential LC VCO Design using Asymmetric Tank Structure

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Author(s): Lee Sang-Yeol | Shrestha Bhanu | Kim Nam-Young

Journal: IETE Journal of Research
ISSN 0377-2063

Volume: 54;
Issue: 6;
Start page: 386;
Date: 2008;
Original page

Keywords: Asymmetric inductance tank | Filtering technique | Heterojunction Bipolar Transistor (HBT) | Phase noise | Symmetric capacitance.

ABSTRACT
This paper presents two InGaP/GaAs HBT (heterojunction bipolar transistor) differential cross-coupled voltage -controlled oscillators (VCO) designed with low phase noise for adaptive feedback-interference cancellation -systems (AF-ICS). The main idea is to use low pass and band pass filtering technique for noise frequency. With this, the -designed VCO, the first one achieved a phase noise of −130.40dBc/Hz at 1MHz offsets from the carrier frequency of 1.619GHz and the second one achieved −127.93dBc/Hz at 1MHz offsets from the carrier frequency of 1.604GHz. Each VCO dissipates an output power of −6.68dBm and −10dBm respectively by supplying 5V. Two pairs of base-collector (BC) junction diode are used as varactor to get a broad band tuning range for both VCOs.
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