Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
2002-09-30
2004-02-03
Jeanpierre, Peguy (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
C341S155000, C341S159000
Reexamination Certificate
active
06686863
ABSTRACT:
BACKGROUND
Small electronic circuits are often used in conjunction with high frequency signals. However, some transmission materials used in such circuits exhibit lossy transmission characteristics with respect to high frequency signals. For example, signals transmitted at 3 to 4 GHz over a small portion of FR4 substrate may experience 30 to 40 dB of loss.
Circuit designers may use analog or digital filters to compensate for the loss. Digital filters usually provide a better combination of linearity, power consumption and scalability than analog filters. However, before a digital filter can filter an analog signal, the signal must be converted to a digital signal by an analog-to-digital converter.
Signals may be transmitted using many signaling schemes. One known scheme is differential current-mode signaling, in which data is represented by a difference between two currents carried by (usually) adjacent signal lines. Differential current-mode signaling is known to result in better common mode noise rejection, power-supply noise rejection, and less return current than other signaling systems. Signaling may be further improved by terminating each signal line with an impedance equal to the intrinsic line impedance. Such impedance matching reduces reflections and crosstalk within the signal lines. Unfortunately, additional elements required for the termination impedance require additional power.
REFERENCES:
patent: 5351010 (1994-09-01), Leopold et al.
patent: 5731776 (1998-03-01), Kumamoto et al.
patent: 6252471 (2001-06-01), Salter et al.
patent: 6388594 (2002-05-01), Velazquez et al.
patent: 6437724 (2002-08-01), Nagaraj
patent: 6452529 (2002-09-01), Li
patent: 6459400 (2002-10-01), Steinbach
patent: 6473013 (2002-10-01), Velazquez et al.
Casper Bryan K.
Jaussi James E.
Buckley Maschoff & Talwalkar LLC
Jeanpierre Peguy
LandOfFree
A/D signal conversion based on a comparison of... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with A/D signal conversion based on a comparison of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A/D signal conversion based on a comparison of... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3336937