Dual mode analog and digital cellular phone

Details Dual mode analog and digital cellular phone Dual mode analog and digital cellular phone

1994-11-17

1997-06-24

Chin, Stephen

Pulse or digital communications

Apparatus convertible to analog

375219, 379 59, H04L 2700

Patent

active

056423780

ABSTRACT:
A dual mode cellular telephone contains modulator and demodulator circuitry that use the same I and Q signals for processing both analog and digital voice data, A power amplifier (PA) bias voltage is varied in coordination with the phone operating mode and geographical location to increase energy efficiency. The power supply for the PA is controlled in combination with a controlled ramp up and ramp down of the modulated I and Q signals to eliminate "spectral splatter" of the transmission band into adjacent frequencies. A variable gain amplifier is coupled to the front end of the phone receiver circuitry to increase the overall dynamic range for the gain of the demodulated I and Q signals. A switching power supply is used in the dual mode phone to increase energy efficiency and reduce the required size of the battery pack.

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