Quadrature detection receiver with separate amplitude and phase

Details Quadrature detection receiver with separate amplitude and phase Quadrature detection receiver with separate amplitude and phase

1988-09-06

1990-02-20

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

209265, H04B 116

Patent

active

049033310

ABSTRACT:
A pair of signal paths 3-1 and 3-2 are connected in parallel to an input 2, each composed of the respective mixing stages 4-1, 4-2, low-pass filters 5-1, 5-2 and mixing stages 6-1, 6-2. The mixing stages 4-1, 4-2 are connected to the oscillator 8 in a phase-quadrature relationship. The mixing stages 6-1, 6-2 are connected to the oscillator 9 in a phase-quadrature relationship and are both connected to a superposition circuit 7 having an output 10. For obviating the drawback of unbalance in the signal processing in the signal paths 3-1, 3-2, the receiver 1 includes a control signal arrangement 11, which is constituted by the respective further mixing stages 14, 25, low-pass filters 47, 48, and mixing stages 17, 29 for producing at the control signal outputs 22, 34 an amplitude and a phase control signal for correcting this unbalance. The linking of the oscillator 9 to the mixing stages 14, 25 and through a divider 36 to the mixing stages 6-1, 6-2 makes the use of an additional narrow band phase-locked loop redundant so that the receiver 1 has short acquisition time, hence is very suitable for use in mobile systems and can easily be integrated on a chip.

REFERENCES:
patent: 3961262 (1976-06-01), Grassmann
patent: 4633315 (1986-12-01), Kasperkovitz

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