Frequency discriminator for a direct conversion receiver

Details Frequency discriminator for a direct conversion receiver Frequency discriminator for a direct conversion receiver

1997-07-10

2000-06-06

Chin, Wellington

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455324, 455263, 455336, 375316, 375344, 375326, H03K 900, H04L 2706, H04B 116

Patent

active

06072997&

ABSTRACT:
In a frequency discriminator for a direct conversion receiver having a simple construction, in which operations for FM demodulation by direct conversion are simplified, two-signal components I and Q, which are inphase and quadrature, respectively, in a base band, obtained by direct conversion of an FM signal by means of a local oscillator, a 90.degree. phase shifter, multipliers, LPF and AMP are amplified to a predetermined amplitude and thereafter converted into digital signals by means of A/D converters. These digital signals are given to differentiators to obtain differentials (finite differences) thereof. These values are squared by means of squarers and squares thus obtained are added by means of an adder. An output of the adder is applied to a device for extracting square root to obtain a demodulation output of the FM signal. An ROM may be used in lieu of the squares and the device for extracting square root.

REFERENCES:
patent: 4090145 (1978-05-01), Webb
patent: 5579345 (1996-11-01), Kroeger et al.
patent: 5675498 (1997-10-01), White
patent: 5832043 (1998-11-01), Eory
patent: 5857004 (1999-01-01), Abe

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