Mobile telephone apparatus with tunable filter tuned to the transmit band

A mobile phone apparatus which is capable of meeting the stringent specifications on transmitter noise in the receive band. The mobile phone apparatus has a modulator for producing a signal to be transmitted in a transmit band, a power amplifier for supplying the signal to be transmitted to an aeria...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	TOLSON NIGEL J
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRONIC CIRCUITRY ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY SELECTING RESONANT CIRCUITS TRANSMISSION TUNING RESONANT CIRCUITS
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Beschreibung
Zusammenfassung:	A mobile phone apparatus which is capable of meeting the stringent specifications on transmitter noise in the receive band. The mobile phone apparatus has a modulator for producing a signal to be transmitted in a transmit band, a power amplifier for supplying the signal to be transmitted to an aerial, a tunable filter disposed between the modulator and the power amplifier and having a passband and an attenuation band, and a control circuit for tuning the filter such that the passband is at the transmit band and the attenuation band is at a receive band of the apparatus.