| 摘要 |
PURPOSE: A spurious eliminator using an OP amplifier in a mobile communication system is provided to eliminate a spurious generated in close vicinity to an analog information signal. CONSTITUTION: A main amplifier(100) amplifies an input analog information signal. A signal delay section(200) delays an information signal having a spurious from the main amplifier(100) by a time delay of an inverting amplifier(500). An attenuator(300) attenuates an information signal having a spurious from the main amplifier(100) by a gain of an information signal from an inverter(400). The inverter(400) inverts a phase of an input analog information signal. The inverting amplifier(500) mixes the information signal having the spurious from the attenuator(300) with a phase-inverted information signal from the inverter(400), offsets an original information signal, amplifies and inverts the spurious by a predetermined level. A signal synthesizer(600) mixes an information signal having a spurious from the signal delay section(200) with a phase-inverted spurious from the inverting amplifier(500), offsets a spurious and outputs the original information signal to a next block.
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