Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1997-08-08
1999-12-21
Trost, William G.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
455326, 455304, 455313, 455306, 4551881, H04B 126, H04B 1110, H04B 108
Patent
active
060060808
ABSTRACT:
A receiving mixer device for a mobile radio transceiver which operates with multiple modulation modes and within multiple frequency bands. The receiving mixer includes a plurality of mixers each for converting a received radio frequency signal to an intermediate frequency, a common connection part to which output terminals of the mixers are connected in common, a plurality of impedance conversion circuits connected to the common connection part, and output terminals for the impedance conversion circuits. The number of mixers is equal to the number of frequency bands of the received radio frequency signal. The number of the intermediate frequencies is equal to the number of modulation modes of the received radio frequency signal. The number of the impedance conversion circuits is equal to the number of intermediate frequencies, and each of the impedance conversion circuits passes only a single predetermined frequency of the intermediate frequencies used by the device.
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patent: 5020147 (1991-05-01), Okanobu
Y. Konishi et al., "Microwave Semiconductor Circuit, "pp. 196-205.
Enoki Takashi
Ishida Kaoru
Kato Hidenobu
Kosugi Hiroaki
Nakayama Keiichi
Legree Tracy M.
Matsushita Electric - Industrial Co., Ltd.
Trost William G.
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