Dual band transmitter for a cellular phone comprising a PLL

Details Dual band transmitter for a cellular phone comprising a PLL Dual band transmitter for a cellular phone comprising a PLL

1998-09-30

2000-11-21

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With intermittent comparison controls

331 16, 331 17, 331 25, 331 60, 331 76, H03L 7093, H03L 718, H03L 7185

Patent

active

06150890&

ABSTRACT:
Disclosed is a dual band wireless phone, such as a cellular phone for a mobile communications system, with a dual band transmitter that includes a phase-locked loop (PLL). The dual band transmitter includes first and second power amplifiers and the PLL. The first power amplifier has a first input for a first signal at a first radio frequency band, and a first output for an amplified first signal. The second power amplifier has a second input for a second signal at a second radio frequency band and a second output for an amplified second signal. The outputs of the power amplifiers are connectable to an antenna. The PLL generates two output frequency ranges and includes a voltage-controlled oscillator (VCO) which has a first output connected to the first power amplifier and generates a first signal. A frequency multiplier has an input connected to the first output of the VCO and a second output connected to the second power amplifier. The frequency multiplier receives the first signal and generates the second signal.

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