Transceiver bandwidth extension using double mixing

Details Transceiver bandwidth extension using double mixing Transceiver bandwidth extension using double mixing

H - Electricity

04

B

H04B 1/26 (2006.01) H03D 7/16 (2006.01) H04B 1/04 (2006.01) H04B 1/40 (2006.01)

Patent

CA 2227673

A radio transceiver system uses a single variable local oscillator frequency source which is used in mixing both before and after a band-pass filter. This causes a reduction in band-pass filter bandwidths. In an all-band transceiver for PCS for example the effect of this reduced bandwidth requirement is to increase the spacing between the transmit bands and the receive bands and thereby enable a reduction in transmission noise interfering with the reception bands.

Système émetteur-récepteur radio faisant appel à une seule source de fréquence variable d'un oscillateur local qui est utilisé pour changer les fréquences à la fois avant et après le filtre passe-bande, ce qui entraîne une réduction des largeurs de bande du filtre passe-bande. Dans le cas d'un récepteur toutes bandes pour un SPC, par exemple, la réduction de la largeur de bande a pour but d'augmenter l'espace entre les bandes de transmission et les bandes de réception et ainsi de permettre une réduction du bruit de transmission en interférence avec les bandes de réception.

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