METHOD AND APPARATUS FOR MONITORING A PHOTO-DETECTOR

In an embodiment of the invention the circuit for monitoring an optical signal detector comprises a current divider current mirror and a current multiplier current mirror. The current divider current mirror has a mirror leg and a primary leg. The primary leg is coupled to the optical signal detector. The current divider current mirror is configured to generate mirror leg current corresponding with a fraction of the primary leg current. The current multiplier current mirror has a mirror leg and a primary leg coupled to the mirror leg of the current divider current mirror. The current multiplier current mirror is configured to generate mirror leg current corresponding with a multiple of the primary leg current. In another embodiment the circuit comprises a first and second current mirror. The first current mirror has a primary current leg and a mirror current leg with the primary current leg exhibiting a resistance corresponding with a fractional part of the resistance exhibited by the mirror current leg, and with the primary current leg of the first current mirror series coupled between the optical signal detector and one of an electrical source and an electrical sink. The second current mirror has a primary current leg and a mirror current leg with the mirror current leg of the second current mirror exhibiting a resistance corresponding with a fractional part of the resistance exhibited by the primary current leg of the second current mirror, and with the primary current leg of the second current mirror series coupled with the mirror current leg of the first current mirror. Dans l'une des exécutions de l'invention, le circuit de suivi d'un détecteur de signaux optiques comporte un miroir de courant diviseur de courant et un miroir de courant multiplicateur de courant. Le miroir de courant diviseur, qui comporte une branche de miroir et une branche primaire, est relié au détecteur de signaux optiques et conçu pour produire un courant de branche de miroir correspondant à une fraction du courant de branche primaire. Le miroir de courant multiplicateur comporte une branche de miroir et une branche primaire reliée à la branche du miroir de courant diviseur. Le miroir de courant multiplicateur est conçu pour produire un courant de branche de miroir correspondant à un multiple du courant de branche primaire. Dans une autre exécution, le circuit comporte un premier et un deuxième miroir de courant. Le premier miroir de courant présente une branche de courant prima