Multiple function thin-film resistor-capacitor array
A multiple function thin-film resistor-capacitor array is used for an optical fiber receiving module. A dielectric thin film with desired pattern and thickness is form on surface of a silicon substrate by semiconductor manufacture process. Resistors of different resistances and capacitors of different capacitances or the combination thereof, and circuit connection therebetween can be provided by controlling the thickness and shape of thin film. The thickness of the thin-film resistor-capacitor array is adjusted by grinding to provide a substrate of a photodiode. The photodiode can be die bonded to the resistor-capacitor array with desired optical position.
1. A method for manufacturing a multiple function thin-film resistor-capacitor array, the thin-film resistor-capacitor array being used for voltage regulation and filtering for an optical fiber receiving module and used as an optical substrate, the optical fiber receiving module comprising a base, a photodiode and a transimpedance amplifier (TIA), the method comprising the steps of:
a). providing a silicon substrate;
b). forming a dielectric thin film on the silicon substrate;
c). forming a metal array layer with resistors of different resistances and capacitors with different capacitances on the dielectric thin film by photolithography and photo mask, and circuit connection therebetween;
d). grinding the silicon substrate to a desired thickness for an optical plane;
e). die bonding a photodiode to the thin-film resistor-capacitor array with the desired optical plane for the photodiode; and
f). finishing the manufacture of the thin-film resistor-capacitor array, where resistors of different resistances and capacitors of different capacitances or the combination thereof are formed.
2. The method as in claim 1 , further comprising:
coating a gold pad on another face of the silicon Substrate to form a contact.
3. The method as in claim 1 , further comprising:
grinding another face of the silicon substrate to adjust the thickness and then coating a gold pad to form a contact.
4. The method as in claim 1 , further comprising:
forming a contact on another face of the silicon substrate by silvery epoxy.
5. The method as in claim 1 , further comprising:
determining resistance of the resistors and capacitance of capacitors on the silicon substrate by controlling a thickness of the dielectric thin film and a pattern of the dielectric thin film.
6. The method as in claim 1 , further comprising:
forming circuit connection between the resistors and capacitors on the silicon substrate by pattern of photo-mask.
7. The method as in claim 1 , further comprising:
selecting the silicon substrate with a thickness according to a required thickness of optical plane.