RECEIVER AND COMMUNICATION TERMINAL
PROBLEM TO BE SOLVED: To provide a receiver and a communication terminal that is properly adaptable to a plurality of communication systems. SOLUTION: The receiver is provided with an antenna section 1, a high frequency filter section 2, a high frequency amplifier section 3, a first orthogonal mixer...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | PROBLEM TO BE SOLVED: To provide a receiver and a communication terminal that is properly adaptable to a plurality of communication systems. SOLUTION: The receiver is provided with an antenna section 1, a high frequency filter section 2, a high frequency amplifier section 3, a first orthogonal mixer section 4, a first local oscillator section 5, a first channel selection filter section 6 that limits a frequency band of I, Q signals, a variable gain amplifier section 7 that adjusts the amplitude, a second orthogonal mixer section 8 that converts the I, Q signals into the base band signals in the case of the TDMA, a second local oscillator section 9, a changeover switch section 10 that selects the variable gain amplifier section 7 or the second orthogonal mixer section 8, a second channel selection filter section 11, and a according section 12 having; analog/digital converters 12a, 12b; an RSSI 12c that obtains the signal amplitude; an AGC 12d that controls the gain of the high frequency amplifier section 3 and the variable gain amplifier section 7 on the basis of the signal amplitude; a CDMA decoding section 12e; a TDMA decoding section 12f; and a receiver mode setting section 12g that sets the first channel selection filter section 6. |
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