Amplifiers – With semiconductor amplifying device – Including class d amplifier
Patent
1989-12-21
1991-06-11
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including class d amplifier
330207A, H03F 3217
Patent
active
050235664
ABSTRACT:
A driver circuit for a voltage-switching, high frequency Class-D power amplifier provides an input sinewave power signal and controls the transition time between switching the two active devices thereof, resulting in substantially lossless switching. The transition time is optimized by controlling the amplitude of the voltage signals at the inputs of the two active devices, depending on the output capacitance of the switching devices, the threshold voltage of the switching devices, the power output requirement, and the impedance of the resonant load network of the Class-D power amplifier.
REFERENCES:
patent: 3239772 (1966-03-01), Dennis, Jr.
patent: 3919656 (1975-11-01), Sokol et al.
Sokal, N. O. and Sokal, A. D., "Class E-A New Class of High-Efficiency Tuned Single-Ended Switching Power Amplifiers", IEEE Journal of Solid State Circuits, vol. SC-10, No. 3, Jun. 1975, pp. 168-176.
Kazimierzuk, M. K. and Puczko, K., "Exact Analysis of Class E Tuned Power Amplifier at Any Q and Switch Duty Cycle", IEEE Transactions on Circuits and Systems, vol. CAS-34, No. 2, Feb. 1987, pp. 149-159.
Chudobiak, W. J. and Page, D. F., "Frequency and Power Limitations of Class-D Transistor Amplifiers", IEEE Journal of Solid-State Circuits, vol. SC-4, Feb. 1969, pp. 25-37.
El-Hamamsy Sayed-Amr A.
Jernakoff George
Breedlove Jill M.
Davis Jr. James C.
General Electric Company
Mullins James B.
Snyder Marvin
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