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CBDS Value / Applications
ComLSI, Inc
February 2010
ComLSI, Inc.
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True Differential, Low Power
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LVDS links, ubiquitous for high-speed data interfaces, operate from high voltage supplies such as 3.3V. CBDS
operates from high or low operating voltages such as 1V with upto 500mV signal swing, or 1V differentially. The
lower supply voltage greatly reduces operating power, a critical design requirement.
CBDS is self-terminating at high signal swing; all of its output current (power) is employed for signal amplitude
generation. LVDS needs source termination for good signal integrity, which halves transmitted signals. Other
factors being the same, CBDS therefore improves SNR by a factor of 2X over LVDS.
CBDS provides matched positive and negative currents into differential signal wire pairs. This minimizes
electromagnetic radiation. Matching of complimentary currents in CBDS improves at lower signal swings at LVDS
or sub-LVDS levels. CBDS is a low-EMI form of “true” differential signaling.
CBDS is the only known fusion of the best characteristics of current and voltage mode signaling. The CBDS driver
has been rigorously verified in simulations in a 180nm CMOS logic fabrication process.
CBDS cuts power consumption while improving performance in PCI-Express, Rapid-IO, Hypertransport, SATA, USB,
HDMI, and LVDS links in portable computing, communication and multimedia devices.
US Patent #7348810 protects the best mode implementation of a CBDS Line Driver. Intel® Corporation has been
known to implement a version of CBDS in their chipset and may infringe on some of the claims in 7348810. Other
infringement by all LVDS chip makers is imminent due to the lower power and higher performance of CBDS.
Infringement by one company, Vizionware Inc. (closed in 2008) and its officers, is under settlement negotiations.
CBDS addresses the Analog Interface market that exceeded $5B in TAM in 2007.
Clean, rapid prosecution by the USPTO with no encumbrances or obligations.
Technology and Silicon IP in 180nm logic CMOS available for immediate translation into a product.
February 2010
ComLSI, Inc.
2
CBDS Application: HDMI
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February 2010
HDMI is a data transfer interface between HD
(and 3D) Televisions and content devices such as
Blu-Ray disc players. Data transfer rates exceed
10Gbps which leads to high signal attenuation
over lossy cables. This necessitates high signal
swings and signal-to-noise-ratio (SNR) to
transmit HDMI data across lengths of cable
beyond ~2m. CBDS provides such signal swings
at low power and low EMI.
CBDS drivers have been designed into a
customer product to drive signals over 25m of
cable length at HDMI 1.3 data rates of 1.65Gbps
per wire-pair.
CBDS drivers provide signal gain at the transmit
end of a system, providing “true” differential
signals without any power penalty. This makes
CBDS ideal for extended-reach, high data-rate
applications such as HDMI.
Future enhancements in televisions, such as
higher refresh rates, greater picture resolution,
and 3D TV will continue to exponentially
increase data rate demand across cables. CBDS
is the transition solution before multimedia data
transmission demands optical cables.
ComLSI, Inc.
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Application: LVDS Replacement
• CBDS improves upon LVDS by providing actively
matched, positive and negative currents into a
differential pair.
• CBDS driver provides self-termination, doubling
output signal for the same current, in applications
requiring high signal swing.
• Working at low operating voltages, CBDS takes much
lower power, scaling with process/voltage.
• CBDS is ideal (true differential), low-EMI signaling.
February 2010
ComLSI, Inc.
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