Switchable filter phase-locked loop frequency synthesizer device

Details Switchable filter phase-locked loop frequency synthesizer device Switchable filter phase-locked loop frequency synthesizer device

1994-08-09

1996-05-21

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455 77, 455306, H04B 106

Patent

active

055198872

ABSTRACT:
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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National Semiconductor, LMX1511 1.1 GHz Frequency Synthesizer for RF Personal Communications, Rev. 2.4, (Preliminary), Jun. 1992, pp. 1-11.
National Semiconductor, MM54HC4066/MM74HC4066 Quad Analog Switch, CMOS Logic Book, Rev 1, 1988 Edition, pp. 3-402-3-406.

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