Wideband driver for class-D power amplifiers

Details Wideband driver for class-D power amplifiers Wideband driver for class-D power amplifiers

2007-04-27

2010-12-28

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including class d amplifier

C330S301000

Reexamination Certificate

active

07859337

ABSTRACT:
A Class-D amplifier having a wideband driver circuit including a first transmission line transformer and a second transmission line transformer. An input of the first transmission line transformer is approximately 180 degrees out of phase from an input of the second transformer. A first transistor (Q1) has an input operatively connected to the first transmission line transformer. A second transistor (Q2) has an input being operatively connected to the second transmission line transformer. The first and the second transmission line transformers cooperate to provide a signal of sufficient magnitude to saturate their associated power transistors in the ON mode and to cut them off in the OFF mode with very small rise and fall transit times, thus providing high efficiency.

REFERENCES:
patent: 3714597 (1973-01-01), Reynolds
patent: 4032851 (1977-06-01), Hoover
patent: 5023566 (1991-06-01), El-Hamamsy
patent: 5053719 (1991-10-01), Tsai
patent: 5306986 (1994-04-01), Siao
patent: 6198347 (2001-03-01), Sander
patent: 6756874 (2004-06-01), Buckles et al.
patent: 6949978 (2005-09-01), Tayrani
Sevick, Jerry, “Transmission Line Transformers,” fourth edition, Noble Publishing Corporation 2001, Chapter 1 Analysis, Section 1.1 Introduction, pp. 1-1 and 1-2.

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