A DLL-based injection-locked frequency synthesizer for WiMedia UWB

A WiMedia ultrawideband (UWB) frequency synthesizer is designed for band group #1. A very fast hopping is achieved by using a delay-locked loop (DLL) architecture which utilizes a novel variable gain voltage-controlled delay line (VCDL) scheme to compensate the phase error generated at the hopping i...

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Bibliographic Details
Main Authors: Ojani, A., Mesgarzadeh, B., Alvandpour, A.
Format: Conference Proceeding
Language:English
Subjects:
Delay
Delay lines
Frequency synthesizers
Gain
OFDM
Phase noise
Synthesizers
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Description
Summary:A WiMedia ultrawideband (UWB) frequency synthesizer is designed for band group #1. A very fast hopping is achieved by using a delay-locked loop (DLL) architecture which utilizes a novel variable gain voltage-controlled delay line (VCDL) scheme to compensate the phase error generated at the hopping instant. Fast-settling DLL allows an injection-locked oscillator (ILO) to be employed to reduce the current consumption in the edge combiner (EC). Simulated in STM 65-nm CMOS technology, synthesizer hopping time is less than two reference cycles. Phase noise at 3432 MHz is -124 dBc/Hz at 1 MHz offset. The adjacent spur level from the Monte Carlo simulation is -34 dBc. Excluding CML divider, the synthesizer draws 6.7 mW from a 1.2 V supply.
ISSN:0271-4302
2158-1525
DOI:10.1109/ISCAS.2012.6271678