Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Patent
1996-06-19
1998-05-19
Nelms, David C.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
330288, 330291, H03B 100, H03F 304
Patent
active
057540667
ABSTRACT:
The present invention teaches a variety of output stages, buffer circuits, and power amplifiers as well as methods for buffering electrical signals. According to one embodiment of the present invention, an output stage includes an input, an output, an error stage coupled between the input and the output and responsive to a difference between an input signal present on the input and an output signal present on the output, the error stage being operative to generate a current control signal related to the difference between the input signal and the output signal, a current mirror coupled to the error stage and responsive to the current control signal to generate a demand driven current signal related to a magnitude of the current control signal, and an amplification stage coupled between the input and the output. Furthermore, the amplification stage is responsive to the input signal and to the demand driven current signal to generate the output signal on the output such that a voltage of the output signal is substantially equal to a voltage of the input signal. Some embodiments provide a unipolar output signal while other embodiments provide a bipolar output signal. In addition, a number of embodiments utilizing bipolar transistor technology, FET technology, and having different configurations which vary the current gain are taught.
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P.J. Walker, Output power transistors' non-linearity does not appear in amplifier transfer characteristic, Wireless World, vol. 81, No. 1480, pp. 560-562, Dec. 1975.
Gain Technology Corp.
Mai Son
Maxim Integrated Products
Nelms David C.
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