Signal oscillator, FM modulation circuit using the same, and FM

Details Signal oscillator, FM modulation circuit using the same, and FM Signal oscillator, FM modulation circuit using the same, and FM

1995-07-11

1996-05-28

Mis, David

Modulators

Frequency modulator

332103, 332119, 375308, 455 93, 455110, H03C 300, H04L 2720

Patent

active

055215599

ABSTRACT:
A coefficient circuit 11 multiplies a digitized input modulation signal by a constant and outputs the multiplied signal. Delay circuits 12 and 13 delay the discrete in-phase input signal and discrete quadrature-phase input signal by 1 sampling cycle, respectively. A multiplying circuit 14 multiplies the multiplied signal by the 1-sampling cycle delayed discrete quadrature-phase input signal. The multiplying circuit 15 multiplies the multiplied signal by the 1-sampling cycle delayed discrete in-phase input signal. The adder circuit 16 adds the multiplication results of the multiplying circuit 14 to the 1-sampling cycle delayed discrete in-phase input signal and outputs the addition result as the discrete in-phase input signal. The subtracting circuit 17 subtracts the multiplication results of the multiplying circuit 15 from the 1-sampling cycle delayed discrete quadrature-phase input signal and outputs the subtraction result as the discrete quadrature-phase input signal.

REFERENCES:
patent: 5225795 (1993-07-01), Iinuma

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