Portable telephone having a receiver section capable of receivin

Details Portable telephone having a receiver section capable of receivin Portable telephone having a receiver section capable of receivin

1991-12-19

1996-08-20

Urban, Edward F.

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

455 76, 455343, H04B 138

Patent

active

055488234

ABSTRACT:
A portable telephone including a synthesized local oscillator using a voltage controlled oscillator in the receiver section and receiving its operation power from either built-in battery or an external power source. A first external voltage substantially equal to the output voltage of the built-in batteries and a second external voltage higher than the first voltage are used as the external power source voltage. The output voltage of the built-in battery and the second external voltage are supplied to the voltage controlled oscillator in response to the use of the built-in battery and the external power source, respectively.

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