Image rejection mixer circuit arrangement

Details Image rejection mixer circuit arrangement Image rejection mixer circuit arrangement

1984-10-09

1986-04-22

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455317, 455325, 455326, 333154, 333193, H04B 110, H04B 126

Patent

active

045847150

ABSTRACT:
An image rejection mixer circuit comprises a pair of mixers (1, 2) to which are supplied input signals from an input terminal (9) and oscillation signals in mutual quadrature from an oscillator (11). The mixer output signals are combined in a combining means (19) to produce at its output (20, 21) a frequency-translated wanted signal free from frequency-translated image signals. The combining means comprises an acoustic surface wave filter and, in order to avoid the necessity of providing it with a pair of input transducers, with the consequent increase in the area of piezo-electric substrate that would entail, it is provided with a single input transducer of the four-phase or pseudo four-phase type. The mixer output signals are applied to respective ones of the quadrature inputs (17 and 18) of the input transducer which, because of the phase relationships between the various components of the mixer output signals, produces acoustic surface waves which travel toward an output transducer if they correspond to a frequency translated wanted input signal and travel away from the output transducer if they correspond to a frequency-translated image signal.

REFERENCES:
patent: 3159790 (1964-12-01), Pratt
patent: 3681697 (1972-08-01), Moroney
patent: 4267533 (1981-05-01), Dempsey et al.

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