Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – Combining of plural signals
Patent
1996-04-26
1998-01-13
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific input to output function
Combining of plural signals
327355, 327359, 327113, 327105, 327156, G06F 7163, H03L 71099
Patent
active
057083835
ABSTRACT:
A circuit for modulating an N-phase first waveform having a frequency F.sub.O with an N-phase second waveform having a frequency F.sub.M. The circuit includes N number of limited swing driver circuits. Each limited swing driver circuit has generator means for generating one phase of a third waveform in response to one phase of the first waveform so that the third waveform has a frequency F.sub.O and a voltage swing that is less than a voltage swing of the first waveform. The circuit also includes N number of multiplier circuits. Each multiplier circuit is coupled to one of the limited swing driver circuits and has multiply means for multiplying one phase of the third waveform with one phase of the second waveform and for generating first and second currents having a difference which is proportional to a product of the one phase of the third waveform and the one phase of the second waveform. A load circuit is coupled to the multiplier circuits and has a first node into which the first currents generated by each of the multiplier circuits are summed together to form a first summation current and a second node into which the second currents generated by each of the multiplier circuits are summed together to form a second summation current. The load circuit has a comparing stage for comparing which of the first and second summation currents is larger and for generating a first clock signal having a frequency approximately equal to a frequency of a change in magnitude of the first and second summation currents. A method of modulating an N-phase first waveform having a frequency F.sub.O with an N-phase second waveform having a frequency F.sub.M is also disclosed.
REFERENCES:
patent: 5122687 (1992-06-01), Schmidt
patent: 5132633 (1992-07-01), Wong et al.
Zhenhua Wang, "A four-Transistor Four-Quandrant Analog Multiplier Using MOS Transistors Operating in the Saturation Region", published in IEEE Transactions on Instrumentation and Measurement, vol. 42, No. 1, Feb. 1993, pp. 75-77.
Paul Gray and Robert Meyer, Analysis and Design of Analog Integrated Circuits, 3rd Edition, published by John Wiley & Sons, Inc., dated 1993, pp. 667-676 no month.
Callahan Timothy P.
Le Dinh T.
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