Telecommunications – Receiver or analog modulated signal frequency converter – Measuring or testing of receiver
Reexamination Certificate
2006-03-07
2006-03-07
Nguyen, Duc M. (Department: 2685)
Telecommunications
Receiver or analog modulated signal frequency converter
Measuring or testing of receiver
C455S226200, C455S334000, C455S308000, C327S350000, C327S351000, C375S340000, C702S070000
Reexamination Certificate
active
07010283
ABSTRACT:
A signal waveform detection circuit includes an amplifier circuit and a comparing circuit. The amplifier circuit has differential amplifiers connected in series. Each of the differential amplifiers has a common connection point. The comparing circuit is connected to the common connection points of the amplifier circuit. The comparing circuit includes comparing units connected to one of the differential amplifiers. Each of the comparing units has a threshold voltage generating circuit for generating signals. Each signal has a threshold voltage that is set between a maximum threshold voltage of a signal output from the corresponding differential amplifier during a maximum amplitude output and a minimum threshold voltage of a signal output from the corresponding differential amplifier during a minimum amplitude output. The comparing unit further has a comparator comparing a voltage at the common connection point with the threshold voltage.
REFERENCES:
patent: 3668535 (1972-06-01), Lansdowne
patent: 4247949 (1981-01-01), Watanabe et al.
patent: 4442549 (1984-04-01), Main
patent: 5298811 (1994-03-01), Gilbert
patent: 5489868 (1996-02-01), Gilbert
patent: 5506537 (1996-04-01), Kimura
patent: 5689814 (1997-11-01), Hagisawa et al.
patent: 6311049 (2001-10-01), Yoshizawa
patent: 6731918 (2004-05-01), Kaneki
patent: 4-25733 (1992-05-01), None
Matsumoto Shuichi
Yoshida Akira
Nguyen Duc M.
Oki Electric Industry Co. Ltd.
Volentine Francos & Whitt PLLC
LandOfFree
Signal waveform detection circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Signal waveform detection circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Signal waveform detection circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3561183