Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Patent
1994-11-18
1996-12-31
Pham, Chi H.
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
455 83, 455 86, 330282, 330302, 330310, H04B 144, H03F 3193, H03F 362
Patent
active
055904122
ABSTRACT:
A communication apparatus for use in a portable telephone is disclosed which has a transmit-receive common amplifier for amplifying a transmitted signal or received signal, and a mixer for frequency-mixing the transmitted signal or the received signal with a local oscillator output, wherein connection between the mixer and an input side of the amplifier and connection between the mixer and an output side of the amplifier are made by means of respective signal-path selector switches. During reception, a deep bias is applied to an FET of the transmit-receive common amplifier to reduce current consumption, and during transmission, a shallow bias is applied to the FET of the transmit-receive common amplifier for increased output.
REFERENCES:
patent: 3146397 (1964-08-01), Broadhead, Jr.
patent: 3519765 (1970-07-01), Huber
patent: 4591802 (1986-05-01), Asazawa
patent: 5023569 (1991-06-01), Raven
patent: 5051705 (1991-09-01), Moghe et al.
patent: 5057791 (1991-10-01), Thompson et al.
"A New Two-Mode Channel FET (TMT) For Super-Low Noise And High-Power Applications"--Minoru Sawada et al. (IEEE Electron Device Letters) vol. 14, No. 7 Jul. 1993.
"A 2/4GHz Single Chip Transceiver" --Monolithic Circuits Symposium (IEEE 1993 Microwave and Millimeter-Wave--Jun. 1993).
Harada Yasoo
Hirai Toshikazu
Honda Keiichi
Imaoka Toshikazu
Nishida Masao
Pham Chi H.
Sanyo Electric Co,. Ltd.
LandOfFree
Communication apparatus using common amplifier for transmission does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Communication apparatus using common amplifier for transmission , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Communication apparatus using common amplifier for transmission will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1150801