Telecommunications – Receiver or analog modulated signal frequency converter – With particular receiver circuit
Reexamination Certificate
1999-03-04
2001-08-28
Nguyen, Lee (Department: 2683)
Telecommunications
Receiver or analog modulated signal frequency converter
With particular receiver circuit
C455S572000, C455S574000, C363S040000
Reexamination Certificate
active
06282415
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a device as disclosed in the introductory part of Claim
1
.
For example, in optical bus systems the users of the bus are switched to a standby mode so as to reduce the power consumption. Nevertheless, in this state power is still required, for example in order to maintain the receiver of the individual users in the standby state. This minimized power consumption may still be too high for given applications, because the users are often battery powered. Thus, a reduction of the power consumption would prolong the availability of the battery-powered users and also enable a reduction of the battery size and the weight.
The article “Call-by-Call Activation Technique for Fiber-Optic Subscriber Transmission Units” in IEEE Transactions on Communications, Vol. COM-35, No. 12, December 1987, pp. 1297 to 1302, describes an optical transmission system in which the components receive a voltage only during the data transmission. In the absence of data transmission, only a few components, inter alia including the optical receiver, continuously receive a voltage. This supply voltage is provided by batteries. A reduction of the power consumption would minimize the batteries and hence the weight.
SUMMARY OF THE INVENTION
Therefore, it is an object of the invention to provide a device which reduces the power required for the receiver in the standby mode, however, without its operation being affected.
This object is achieved by means of the steps disclosed in the characterizing part of Claim
1
.
The response time of the receiver can be influenced by variation of the frequency and the pulse duty factor. The higher the frequency, the less time will be required by the receiver so as to initiate a wake-up procedure in the user of the bus.
The pulse duty factor determines the factor whereby the power consumption in the means is reduced. For example, if the power consumption is to be reduced to one quarter of the original value, a pulse duty factor of 1:3 should be selected and adjusted in the circuit.
The period of time during which the receiver is in the standby mode, for example because it does not receive modulated light, is substantially longer than the period of time during which modulated light arrives. As a result of this ratio a large amount of power is saved.
REFERENCES:
patent: 5027052 (1991-06-01), Bauch et al.
patent: 5627882 (1997-05-01), Chien et al.
patent: 5689407 (1997-11-01), Marinus et al.
patent: 5758278 (1998-05-01), Lansdowne
patent: 5778312 (1998-07-01), Kawashima
patent: 5784268 (1998-07-01), Steffek et al.
patent: 5806006 (1998-09-01), Dinkins
patent: 5903601 (1999-05-01), Elnashar et al.
patent: 5950120 (1999-09-01), Gardner et al.
patent: 5953646 (1999-09-01), Hirasawa
patent: 5982642 (1999-11-01), Herfurth
patent: 5987339 (1999-11-01), Asano
patent: 6091527 (2000-07-01), Brisse et al.
“Calll-by-Call Activation Technique for Fiber-Optic Subscriber Transmission Units”, by Nagata et al., IEEE Transactions on Communications, vol. COM-35, No. 12, Dec. 1987.
Bühler Olaf
Knobl Karl-Heinz
Nguyen Lee
Nguyen Simon
U.S. Philips Corporation
LandOfFree
Power supply in the standby mode does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Power supply in the standby mode, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power supply in the standby mode will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2437625