development-of-low-phase-noise-small-foot-print-surface-mount-voltage-controlled-oscillator IEEE PAPER, IEEE PROJECT
DEVELOPMENT OF LOW PHASE NOISE SMALL FOOT PRINT SURFACE MOUNT VOLTAGE CONTROLLED OSCILLATOR
Ameen Ahmed, Noushad S, Suchitav Khadanga, K.R.Suresh Nair, P.K.Radhakrishnan
NeST Research & Development Center,
Plot # 43,CEPZ, Kakkanad
COCHIN-682 030.
Abstract: Recently Voltage Controlled Oscillator (VCO) has emerged as a fascinating candidate to satisfy strong demands in the rapidly growing wireless communication products, test equipment and system development. Modular configuration with low phase noise is the desirable feature to be incorporated in VCOs for their better usage. Here we report development of a low phase noise small foot print (0.5”x0.5”x0.205”) voltage controlled oscillator operating in a frequency range of 2.9 to 3.1 GHz for RACON applications. The oscillator is realised as a surface mount unit. The paper gives details on the performance as well as the test procedures.
INTRODUCTION:
Voltage controlled oscillators (VCOs) remain as the basic building block for any of present communication or transmission scheme including cellular mobile telephone, radar systems, etc. Voltage controlled oscillators in commonly used frequency bands are commercially available from many manufacturers. Current development effort is for a Radio beacon (normally known as RACON) system, where the frequency band requirement is from 2.9 to 3.1 GHz. Some manufacturers offer oscillators covering this band, but these are seen to be of wide operating range, which reduces the tuning sensitivity. The system requirement calls for a tuning range of 2.9 to 3.1 GHz with control voltage of 4 Volts. In order to keep low phase noise, special design and layout techniques were used. The successful development of this VCO led to requirement of production of many such units, and thus the developed units have been tested for its characteristics.
The VCO consists of a resonator network, amplifier and output matching network with feed back arrangement as shown in Fig.1.
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