Amplitude limiting circuit and CDMA communication apparatus

Details Amplitude limiting circuit and CDMA communication apparatus Amplitude limiting circuit and CDMA communication apparatus

2008-05-06

2008-05-06

Ngo, Ricky Q. (Department: 2616)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

C370S342000, C370S441000, C375S297000

Reexamination Certificate

active

07369580

ABSTRACT:
An amplitude limiting circuit for limiting the amplitude of a signal input to a power amplifier includes an amplitude converter, determination unit, peak detector, window filter, delay circuit, and multiplier. The amplitude converter calculates the amplitude value of an input signal. The determination unit detects an interval in which the amplitude value of the input signal exceeds a preset threshold. The peak detector detects the peak time and amplitude when the maximum amplitude appears. The window filter limits the amplitude value to not more than the threshold by using the peak value output from the peak detector. The delay circuit delays the input signal such that the peak time output from the peak detector coincides with the time when the output from the window filter exhibits the minimum value. The multiplier multiplies an output signal from the delay circuit by a window function. A CDMA communication apparatus is also disclosed.

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