Efficient pulse amplitude modulation transmit modulation

Details Efficient pulse amplitude modulation transmit modulation Efficient pulse amplitude modulation transmit modulation

2005-08-02

2005-08-02

Nguyen, Linh My (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S173000

Reexamination Certificate

active

06924681

ABSTRACT:
Efficient PAM transmit modulation is provided by a PAM modulator that includes an oscillator (404) that provides a clock signal, CKV, (408). The clock signal408and a delayed version (CKV_DLY)420of the clock signal are provided to a logic gate (414). The output of logic gate (414) is used as a power amplifier input signal (PA_IN) for radio frequency power amplifier (416). Depending on the relative time delay of the CKV clock signal (408) and the CKV_DLY delayed clock signal (420), the timing and duty cycle of the logic gate (414) duty cycle can be controlled. The duty cycle or pulse-width variation affects the turn-on time of the power amplifier (416); thereby establishing the RF output amplitude.

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