| 摘要 |
A cellular telecommunications device and method for achieving dual-mode cellular communications. The cellular telecommunication device comprises switchable loop filters, a loop filter switch controller, a programmable frequency synthesizer, and a voltage controlled oscillator arranged in a phase-locked loop configuration. The switchable loop filters comprise low-pass filters to optimize the performance of the device in both the analog and digital modes of cellular communications. Mode changes are facilitated by the switch controller which automatically configure the loop filters arrangement in response to a mode code sent to the cellular device from a cellular base station.
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