Angle demodulator

Details Angle demodulator Angle demodulator

H - Electricity

03

D

329/15

H03D 3/24 (2006.01) H03D 3/02 (2006.01)

Patent

CA 1255365

PHN 11.543 18 02.09.1986 ABSTRACT Angle demodulator. 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° 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 PLL 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.

518579

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