Linear phase modulator including a pair of Armstrong modulators

Details Linear phase modulator including a pair of Armstrong modulators Linear phase modulator including a pair of Armstrong modulators

1976-05-11

1977-06-07

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 23R, H03C 340

Patent

active

040286410

ABSTRACT:
The present invention relates to a linear phase modulator comprising two known Armstrong modulators connected in a balanced configuration to eliminate even-order nonlinearities in the output phase modulated signal. In addition, a preselected amount of in-phase carrier is added to the quadrature carrier normally added to the output of the suppressed-carrier modulator forming a part of each Armstrong modulator, the carriers being added to each modulator output, however, differing in phase from quadrature by equal and opposite amounts. By properly preselecting the amount of phase difference from quadrature of the added carriers, third-order nonlinearities can also be substantially eliminated after combining the outputs of the Armstrong modulators in a multiplier circuit.

REFERENCES:
patent: 2238249 (1941-04-01), Crosby
patent: 2431569 (1947-11-01), Labin
patent: 2501355 (1950-03-01), Pratt
patent: 2543222 (1951-02-01), Bird
patent: 2822523 (1958-02-01), Bargellini
patent: 2877422 (1959-03-01), Holloway
patent: 3249897 (1966-05-01), Trilling
patent: 3783413 (1974-01-01), Froment et al.
patent: 3818378 (1974-06-01), Phillips
patent: 3906401 (1975-09-01), Seidel
Ruthroff et al., "A Linear Phase Modulator for Large Baseband Bandwidths", The Bell System Technical Journal, Oct. 1970, pp. 1893-1903.

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