Method of amplifying a digital signal and device therefor

Details Method of amplifying a digital signal and device therefor Method of amplifying a digital signal and device therefor

2006-06-08

2008-07-15

Mottola, Steven J (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including class d amplifier

C330S20700P

Reexamination Certificate

active

07400194

ABSTRACT:
An efficient method of amplifying a digital signal with reduced electromagnetic interference is disclosed. The invention applies an average amplitude detector to the input signal to control the clock frequency of a pseudo-random number generator so that the clock signal decreases when the average amplitude of the signal increases. The input signal and the pseudo-random number generator are compared to generate a control signal for a switching power amplifier followed by a low-pass filter. When the average amplitude of the input signal falls below a pre-determine threshold, the switching amplifier is placed in a sleep mode.

REFERENCES:
patent: 6166595 (2000-12-01), Moldsvar et al.
patent: 6445247 (2002-09-01), Walker
patent: 6888403 (2005-05-01), Cho et al.

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