Power control of a direct sequence cdma radio

Details Power control of a direct sequence cdma radio Power control of a direct sequence cdma radio

H - Electricity

04

B

H04B 1/04 (2006.01) H03G 3/20 (2006.01) H04B 7/005 (2006.01) H04B 7/216 (2006.01) H04J 13/00 (2006.01) H04J 13/04 (2006.01)

Patent

CA 2086009

The power control apparatus of the present invention is comprised of a local oscillator signal path coupled to a mixer (106) through a variable attenuator (107) and an IF signal path coupled to the mixer (106) through two variable attenuators (108 and 109) coupled in series. The IF signal path atten- uators (108 and 109) are controlled by digital control circuitry (111) while the local oscillator path attenuator (107) is controlled by the control circuitry through a level shifter (110). The power level of the signal generated by the mixing of these two signals is less than the conducted output of the radiotelephone's power amplifier.

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