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A wideband subharmonically injection-locked frequency synthesizer for LMDS

✍ Scribed by Quan Xue

Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
110 KB
Volume
30
Category
Article
ISSN
0895-2477

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✦ Synopsis

Abstract

A low‐cost wideband subharmonically injection‐locked frequency synthesizer for local multipoint distribution system (LMDS) down‐converter applications is introduced in this letter. This synthesizer consists of a 2.0 GHz PLL synthesizer, and is a general‐purpose bipolar transistor VCO at 5.8 GHz. The 5.8 GHz VCO is not only subharmonically injection locked by a 2.0 GHz PLL synthesizer, but also, the varactor diode's voltage is adaptively controlled by the 2.0 GHz PLL controlling voltage via a suitable converter at the same time. In this way, real‐time wideband locking can be attained. When third subharmonically injection locked, the output power of the synthesizer is more than 7.5 dBm, with a bandwidth of more than 25%. At 5.8 GHz, the power is 8.5 dBm, and the phase noise is −93 dBc/Hz at an offset frequency of 100 kHz. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 30: 310–312, 2001.

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