Custom Circuit Solutions for
High Performance Applications
High Performance Applications
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LC Tank Based PLL IP Products
In applications where ultra low jitter/phase noise is required, a high
quality LC PLL is required. Fully integrated LC Tank based PLLs
can achieve 20-60 times lower phase noise for a given power
specification than a ring based PLL. This makes LC Tank based
PLLs optimal for high performance applications such as wireless,
high speed IO, or clocking of high resolution data converters.
LC based PLLs have historically been difficult to design due to poor
modeling of integrated inductance, substrate losses, and package
parasitics. In addition, classical LC PLLs have a very narrow
frequency tuning range making it possible that the VCO will not be
capable of oscillation at the desired frequency. However, Silicon
Creations has overcome these problems in two ways. First, a high
quality coarse tuning element is used which gives a single VCO a
wide tuning range to overcome PVT variations and model
inaccuracy. Additionally, a multiple VCO core design has been
developed and can be used to cover up to a 2:1 frequency range.
Examples of the multiple VCO core design are shown in the right
hand column.
Silicon Creations has LC PLL designs in technologies from 90nm
to 180nm CMOS and with frequencies from 1.4GHz to 6.25GHz.
Applications range from optical communications to RF synthesis.
Data sheet is available upon request.
quality LC PLL is required. Fully integrated LC Tank based PLLs
can achieve 20-60 times lower phase noise for a given power
specification than a ring based PLL. This makes LC Tank based
PLLs optimal for high performance applications such as wireless,
high speed IO, or clocking of high resolution data converters.
LC based PLLs have historically been difficult to design due to poor
modeling of integrated inductance, substrate losses, and package
parasitics. In addition, classical LC PLLs have a very narrow
frequency tuning range making it possible that the VCO will not be
capable of oscillation at the desired frequency. However, Silicon
Creations has overcome these problems in two ways. First, a high
quality coarse tuning element is used which gives a single VCO a
wide tuning range to overcome PVT variations and model
inaccuracy. Additionally, a multiple VCO core design has been
developed and can be used to cover up to a 2:1 frequency range.
Examples of the multiple VCO core design are shown in the right
hand column.
Silicon Creations has LC PLL designs in technologies from 90nm
to 180nm CMOS and with frequencies from 1.4GHz to 6.25GHz.
Applications range from optical communications to RF synthesis.
Data sheet is available upon request.
Copyright © 2008 Silicon Creations, LLC. All rights reserved.
Shown above: A delta-sigma
fractional-N synthesizer with a 4 VCO
core targeted at high performance
S-band applications over a 1.9-3.8GHz
range.
fractional-N synthesizer with a 4 VCO
core targeted at high performance
S-band applications over a 1.9-3.8GHz
range.
Shown above: An optical link chipset
containing an LC based 5.3GHz
serializer and an LC based 5.3GHz
CDR.
containing an LC based 5.3GHz
serializer and an LC based 5.3GHz
CDR.
Shown above: A test chip containing
multiple VCO cores targeted for use in
SONET OC-192 and 12.5Gb/s Fiber
Channel CDR applications.
multiple VCO cores targeted for use in
SONET OC-192 and 12.5Gb/s Fiber
Channel CDR applications.