Angle demodulator with second order interference prevention

Details Angle demodulator with second order interference prevention Angle demodulator with second order interference prevention

1986-09-19

1988-04-26

Laroche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329107, 329124, H03D 318, H03K 904

Patent

active

047407590

ABSTRACT:
Angle demodulator having a signal input (I) for applying an angle-modulated input carrier (A) thereto, which demodulator is coupled to a phase detection arrangement (2) to which also a quadrature detection carrier (D) frequency-coupled with the input carrier (A) is applied for demodulating the angle modulation signal, said quadrature detection carrier (D) being shifted at least substantially 90.degree. in phase relative to the input carrier (A) at the central frequency of the input carrier (A), said phase detection arrangement (2) being coupled via a low-pass filter (6) to a signal output (O). Angle demodulators of this type, which may be designed as FM quadrature or PPL angle demodulators, cause a second order interference product which is inherent in the multiplication of two carriers (A and D) in mutual phase quadrature. According to the invention, to reduce the interference, a further carrier (B), which is either in phase or in anti-phase with the input carrier (A) at the central frequency, is generated, which carrier (B) is used in the phase detection arrangement (2) for compensating said interference product.

REFERENCES:
patent: 3564434 (1971-02-01), Camenzind et al.
patent: 4365205 (1982-12-01), Dehaene
patent: 4426735 (1984-01-01), Kasperkovitz

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