Active step attenuator

Details Active step attenuator Active step attenuator

2007-03-12

2010-02-09

Dao, Minh D (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S213000, C455S286000, C455S306000, C725S126000, C375S221000, C370S486000

Reexamination Certificate

active

07660570

ABSTRACT:
An active step attenuator can attenuate the RF signal from a cable modem or other RF source. The active step attenuator converts the RF energy into a DC control signal that controls the attenuation applied to the RF signal. The voltage of the control signal is proportional to the RF energy, so that the active step attenuator attenuates a stronger RF signal more than a weaker RF signal. The active step attenuator may be in the form of a diplex circuit, one branch of which passes signals in one frequency band without attenuation and the other branch of which actively attenuates signals in another frequency band.

REFERENCES:
patent: 3598902 (1971-08-01), Davis et al.
patent: 4466017 (1984-08-01), Banker
patent: 4471380 (1984-09-01), Mobley
patent: 4520507 (1985-05-01), Moon
patent: 5263021 (1993-11-01), Ortel
patent: 5321849 (1994-06-01), Lemson
patent: 5678198 (1997-10-01), Lemson
patent: 5737687 (1998-04-01), Martin et al.
patent: 5956075 (1999-09-01), Matsuo
patent: 6285865 (2001-09-01), Vorenkamp et al.
patent: 6549766 (2003-04-01), Vorenkamp et al.
patent: 6570465 (2003-05-01), Tang
patent: 6598232 (2003-07-01), McAlear
patent: 6865381 (2005-03-01), Vorenkamp et al.
patent: 7194037 (2007-03-01), Sutardja
patent: 7486722 (2009-02-01), Brommer et al.
patent: 7515895 (2009-04-01), Vorenkamp et al.
patent: 2001/0011013 (2001-08-01), Vorenkamp et al.
patent: 2002/0067222 (2002-06-01), Tang
patent: 2003/0114112 (2003-06-01), Strater et al.
patent: 2005/0054315 (2005-03-01), Bajgrowicz et al.
patent: 2005/0250541 (2005-11-01), Bird et al.
patent: 2006/0031911 (2006-02-01), Shafer et al.
patent: 2008/0313694 (2008-12-01), Kudo et al.
patent: 2009/0052901 (2009-02-01), Cagle
A Voltage Variable Attenuator Using Silicon PIN Diodes and a Passive GaAs MMIC in a Plastic SMT Package; Microwave Journal; Nov. 2000; RF & MW Components Group, M/A-Com Inc., Lowell, MA www.mwjournal.com.
A Low-Cost Surface Mount PIN Diode Attenuator; Hewlett-Packaged RF and Microwave Applications Seminar; 1973 www.semiconductor.agilent.com.
APNI003: A Wideband General Purpose PIN Diode Attenuator; Skyworks Solutions, Inc.; Dec. 5, 2005 www.skyworksinc.com.

Affiliated with

Also associated with

Rating

Active step attenuator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Active step attenuator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Active step attenuator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4213399