Receiving mixer circuit for mobile radio transceiver designed to operate with multiple modulation modes and multiple frequency bands

Assignee: Panasonic Holdings Corp

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Filing: 1997-08-06

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Granted: —

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Expires: 2017-08-06

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Abstract

Abstract A receiving mixer for a mobile radio transceiver designed to operate with multiple modulation modes and multiple frequency bands, has : 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 said mixers are connected in common; a plurality of impedance conversion circuit connected to said common connection part; and output terminals for said impedance conversion circuit; wherein said mixers are equal in number to the kinds of frequencies of said received radio frequency signal, the number of kinds of said intermediate frequencies is the same as the number of modulation modes that the frequency of said received radio frequency signal has, the number of said impedance conversion circuit is the same as the number of kinds of said intermediate frequencies, and each of said impedance conversion circuit passes only one uniquely predetermined frequency out of said kinds of intermediate frequencies.

Inventors

👤 Hidenobu Katoh
👤 Keiichi Nakayama
👤 Seiichi Yamaguchi
👤 Takeshi Enoki
👤 Manabu Yamaguchi
👤 Kaoru Ishida
👤 Hiroaki Kosugi

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-11-05 09:01

CPC Classifications

H; H03; H03C; H03C1/00; H04; H04B; H04B1/00; H04B1/005; H04B1/0053; H04B1/0057; H04B1/06; H04B1/16; H04B1/26; H04B1/38; H04B1/40; H04B1/403; H04B1/406

Claims Analysis

Total Claims: 8

Claim 1

Independent Claim 155 words

A receiving mixer for a mobile radio transceiver designed to operate with multiple modulation modes and multiple frequency bands, comprising: 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 said mixers are connected in common; a plurality of impedance conversion means connected to said common connection part; and output terminals for said impedance conversion means; wherein said mixers are equal in number to the kinds of frequencies of said received radio frequency signal, the number of kinds of said intermediate frequencies is the same as the number of modulation modes that the frequency of said received radio frequency signal has, the number of said impedance conversion means is the same as the number of kinds of said intermediate frequencies, and each of said impedance conversion means passes only one uniquely predetermined frequency out of said kinds of intermediate frequencies.

Claim 2

Dependent Claim 19 words

A receiving mixer circuit according to claim 1, wherein phasers (phase shifters) are used as said impedance conversion circuits.

Claim 3

Dependent Claim 18 words

A receiving mixer circuit according to claim 1, wherein transmission lines are used as said impedance conversion circuits.

Claim 4

Dependent Claim 18 words

A receiving mixer circuit according to claim 1, wherein lumped-constant circuits are used as said impedance conversion circuits.

Claim 5

Dependent Claim 79 words

A receiving mixer circuit according to any one of claims 1 to 4, wherein said mixer uses a dual-gate FET whose source is grounded, whose first gate is connected to a receive frequency matching means and a first gate bias supplying means, whose second gate is connected to a local oscillator frequency matching means and a second gate bias supplying means, and whose drain is connected to a receive intermediate frequency matching means and a drain bias supplying means.

Claim 6

Dependent Claim 33 words

A receiving mixer circuit according to claim 5, wherein said dual-gate FET, said receive frequency matching means, said bias supplying means, and said impedance conversion circuits are fabricated on the same semiconductor substrate.

Claim 7

Dependent Claim 46 words

A receiving mixer circuit according to claim 5 or 6, wherein the source of said dual-gate FET is connected to a resistor and a capacitor in parallel, whose other ends are grounded to bias the first and second gates of said dual-gate FET to ground potential.

Claim 8

Dependent Claim 40 words

A mobile communication radio transceiver comprising: a receiving mixer circuit according to any one of claims 1 to 7; demodulating means for demodulating the outputs of said impedance conversion means; and a speaker for converting the demodulated signals into sound.

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