Telecommunications – Receiver or analog modulated signal frequency converter – Frequency or phase modulation
Patent
1996-08-20
1998-09-01
Au, Amelia
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency or phase modulation
455318, H04B 116
Patent
active
058024638
ABSTRACT:
A very low intermediate frequency (IF) transceiver is described for use in a wireless LAN, cellular telephone, cordless telephone, and other radio transceiver applications. The transceiver preferably directly down-converts the RF signal to lower frequency such as a very low IF signal, which can be handled by transceiver components advantageously integrated with the communication control system such as an MAC or serial communications controller. Preferably, the very low IF signal is above peak modulation deviation and below the channel interval for the communication system. The very low IF signal may be up converted so that the RF signal can be more reliably demodulated. Alternatively, the RF signal can be additionally converted to a second IF frequency before the very low IF frequency to reduce the effects of noise in the transceiver. Alternatively, an image rejection mixer circuit can be employed to provide some rejection selectivity for the adjacent channels on one side of the local oscillator. Alternatively, a phasing circuit can be added in the receiver front end to assist in the isolation of the local oscillator signal from the antenna.
REFERENCES:
patent: 4653117 (1987-03-01), Heck
patent: 4852123 (1989-07-01), Bickley et al.
patent: 5109531 (1992-04-01), Heck
Advanced Micro Devices , Inc.
Au Amelia
LandOfFree
Apparatus and method for receiving a modulated radio frequency s does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for receiving a modulated radio frequency s, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for receiving a modulated radio frequency s will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-283668