Distributed class G type amplifier switching method

Details Distributed class G type amplifier switching method Distributed class G type amplifier switching method

2007-03-20

2008-08-05

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including particular power supply circuitry

C330S251000

Reexamination Certificate

active

07408414

ABSTRACT:
An improved Class G type amplifier which switches between multiple power rails depending upon the instantaneous amplitude of the input signal versus the power rails. The low voltage (inner) amplifier includes a plurality of parallel amplifier devices, and the high voltage (outer) amplifier includes a plurality of parallel amplifier devices. A plurality of switches each couples the input signal to either a respective one of the inner amplifier devices or a respective one of the outer amplifier devices. The switches are activated sequentially, such that the switching from inner to outer amplifier devices or vice versa is staggered over some period of time. This avoids having a single, large glitch in the output, and spreads multiple smaller glitches over enough time that some of the glitch energy can fall within the frequency range where the amplifier's feedback circuitry can eliminate its noise. The switches are sequentially activated by a series of delay elements.

REFERENCES:
patent: 6838942 (2005-01-01), Somerville et al.
patent: 6982600 (2006-01-01), Harvey

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