Large dynamic range multiplier for a maximal-ratio...

Details Large dynamic range multiplier for a maximal-ratio... Large dynamic range multiplier for a maximal-ratio...

H - Electricity

04

B

325/42

H04B 7/04 (2006.01)

Patent

CA 1141437

Abstract An improved large dynamic range multiplier is dis- closed that provides substantially ideal multiplication for signals within a maximal-ratio predetection diversity combiner. Linear product multiplication is necessary in the second mixing stage of the maximal-ratio predetection diversity combiner, where it is essential that the mixer product signal be proportional to the product of its input signals, which each have a dynamic range in excess of 40 db. The multiplier, which in the preferred embodiment of the present invention is a field-effect-transistor device, provides a product signal that has a linear dynamic range approaching 130 db, far in excess of the 80 db necessary to accommodate typical input signals having a 40 db dynamic range.

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