Digital amplitude modulator and method of signal combining

Details Digital amplitude modulator and method of signal combining Digital amplitude modulator and method of signal combining

1992-06-24

1993-12-07

Grimm, Siegfried H.

Modulators

Amplitude modulator

Plural modulation

332163, 375 41, 455108, H03C 100

Patent

active

052686582

ABSTRACT:
A digital amplitude modulator receives a plurality of phase coherent input signals from a plurality of amplifiers (A1-An) respectively representing the bits of a plural bit digital word and converts them to a single output signal on an output with a first plurality of transformers having transformer ratios which vary substantially in accordance with a power of two corresponding to the significance of the bit represented by the input signal being converted thereby and a second plurality of transformers having primaries connected to the first plurality of transformers, respectively, and secondaries all connected in series together to an output terminal and transformer ratios which vary in substantial accordance with the same powers of two that the transformer ratio of the first plurality of transformers to which they are connected vary. In one embodiment the second group of transformers are transmission line element transformers with electrical lengths equal to one quarter wavelength, while in another embodiment element coil transformers are employed.

REFERENCES:
patent: 4580111 (1986-04-01), Swanson
patent: 4804931 (1989-02-01), Hulick
"Digital Amplitude Modulation", Broadcast Engineering, pp. 66-80, Dec. 1987, Timothy P. Hulick.

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