Differential audio line receiver

H - Electricity – 03 – F

Patent

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Details

H03F 3/45 (2006.01) H03F 3/347 (2006.01)

Patent

CA 2161117

An audio line receiver which tolerates a wide range of balanced and unbalanced source impedances with a minimal deterioration of the line receiver's common-mode rejection ratio. The line receiver includes a differential amplifier (50) with input amplifiers (52, 54) on each input of the differential amplifier. The input amplifiers are typically operation amplifiers (A8 or A9) connected for unity gain, but also having two bias resistors (R17 and R19, or R18 and R20) connected in series between the input terminals of the input amplifiers and ground. A capacitor (C1 or C2) connected from the output of the operational amplifier to a node between the two series connected bias resistors prevents the low impedance of the bias resistors from significantly degrading the line receiver's common-mode rejection ratio.

Récepteur pour ligne audio, tolérant une grande diversité d'impédances de source équilibrées et non équilibrées en ramenant au minimum la détérioration du rapport d'affaiblissement dans le mode commun dudit récepteur. Comprend un amplificateur différentiel (50) doté d'amplificateurs d'entrée (52, 54) à chacune de ses entrées. Les amplificateurs d'entrée sont généralement des amplificateurs opérationnels (A8 et A9) à gain unité, mais ayant en outre deux résistances de polarisation (R17 et R19, ou R18 et R20) connectées en série entre les bornes d'entrée des amplificateurs d'entrée et la masse. Un condensateur (C1 ou C2) reliant la sortie de l'amplificateur opérationnel à un noeud situé entre les deux résistances de polarisation série empêche la basse impédance des résistances de polarisation de détériorer sensiblement le rapport d'affaiblissement dans le mode commun du récepteur.

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