Methods and apparatus for switching between class A and A/B...

Details Methods and apparatus for switching between class A and A/B... Methods and apparatus for switching between class A and A/B...

2006-05-30

2006-05-30

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

C330S165000

Reexamination Certificate

active

07053714

ABSTRACT:
Methods and apparatus contemplate: an output transformer having at least first and second separate primary windings and at least one secondary winding, each winding including a first (in phase) end and a second (out of phase) end; at least first and second active elements, each having at least a pair of power terminals and a control terminal, one power terminal of each active element being coupled to a common node; and a switching circuit operable to change a circuit configuration of the first and second primary windings and the active elements between a class A mode and a class A/B mode.

REFERENCES:
patent: 3898575 (1975-08-01), Koch
patent: 6323733 (2001-11-01), Gorcea et al.

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