Angle modulation dectector

Details Angle modulation dectector Angle modulation dectector

1991-11-22

1992-11-24

Pascal, Robert J.

Demodulators

Frequency modulation demodulator

Input signal split into plural signals

329321, 329345, H03D 300

Patent

active

051666332

ABSTRACT:
An angle modulation detector which prevents a demodulated output from being influenced by fluctuations in the amplitudes of signals generated from angle-modulated signal sources such as a phase-modulated signal and a frequency-modulated signal, even if the amplitude of a driving voltage applied to a connection between the bases of a pair of transistors constituting a phase detecting device is made larger in order to enhance the demodulation sensitivity and reduce noise produced during demodulation. As an example of a resolution, the angle modulation detector comprises two coupling devices, two current dividing devices coupled to generate a phase detecting output, a current dividing device coupled to generate a re-mixed output, and a phase detecting device, wherein the outputs of the two coupling devices are connected to the two current driving devices driven by the same signal, so that the respective input and output terminals are at the same voltage level, whereby two outputs thereof are not influenced by fluctuations in amplitudes of angle-modulated signals supplied to the coupling devices.

REFERENCES:
patent: 3667060 (1972-05-01), Avins
patent: 3702442 (1972-11-01), Janssen et al.

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