Direct attach optical receiver module and method of testing
View Patent ↗A direct attach optical receiver module and a system and method for testing the direct attach optical receiver module are provided. An optical receiver module may include an optical detector and an integrated circuit with an integrated amplifier circuit and at least one integrated capacitor. In one example, the optical detector may be physically attached to the integrated circuit and the output port of the optical detector may be electrically coupled to the input port of the integrated circuit. In another example, a redistribution layer that includes a tuning inductor may be being physically attached between the optical detector and the integrated circuit.
1. An optical receiver module, comprising:
an optical detector that includes a photosensor for receiving light and an output port for providing a photocurrent;
an integrated circuit that includes an integrated amplifier circuit and at least one integrated decoupling capacitor, the integrated circuit including an input port for receiving the photocurrent;
the optical detector being physically attached directly to the integrated circuit and the output port of the optical detector being electrically coupled to the input port of the integrated circuit;
wherein the optical detector, integrated amplifier circuit and at least one integrated decoupling capacitor form a closed loop circuit in which the electrical connection between the output port of the optical detector and the input port of the integrated circuit provides substantially all of the inductance in the closed loop circuit.
2. The optical receiver module of claim 1 , wherein the output port of the optical detector and the input port of the integrated circuit are electrically coupled using a flip-chip bonding technique.
3. The optical receiver module of claim 2 , wherein the optical detector and the integrated circuit are physically attached by at least the flip-chip bond between the output port of the optical detector and the input port of the integrated circuit.
4. The optical receiver module of claim 1 , wherein the output port of the optical detector and the input port of the integrated circuit are electrically coupled using a wire bond.
5. The optical receiver module of claim 1 , wherein the optical detector and the integrated circuit are physically attached by an adhesive material.
6. An optical receiver module, comprising:
an optical detector that includes a photosensor for receiving light and an output port for providing a photocurrent;
an integrated circuit that includes an input port for receiving the photocurrent; and
a redistribution layer that includes a tuning inductor, the redistribution layer being physically attached between the optical detector and the integrated circuit, and the tuning inductor being electrically coupled in series with the optical detector.
7. The optical receiver module of claim 6 , wherein the integrated circuit includes an integrated amplifier and at least one integrated capacitor that are coupled to the input port.
8. The optical receiver module of claim 6 , wherein the optical detector, integrated amplifier circuit, tuning inductor, and at least one integrated capacitor form a closed loop circuit in which the tuning inductor provides substantially all of the inductance in the closed loop circuit.
9. A method of manufacturing an optical receiver module, comprising:
providing an integrated circuit that includes an input port for receiving the photocurrent;
determining a desired inductance for the optical receiver module;
fabricating a redistribution layer on the integrated circuit, the redistribution layer including a tuning inductor having an inductance value that is selected to achieve the desired inductance for the optical receiver module; and
attaching an optical detector to the redistribution layer;
the tuning inductor being electrically coupled in series with the optical detector.
10. The method of claim 9 , further comprising:
fabricating at least one additional redistribution layer on the integrated circuit, wherein each additional redistribution layer includes an additional tuning inductor, and wherein the tuning inductor and additional tuning inductors are coupled in series between the output port of the optical detector and the input port of the integrated circuit.
11. The method of claim 9 , wherein the integrated circuit is fabricated on a wafer of integrated circuits, further comprising:
determining the inductance value for the tuning inductor to optimize performance based on specific characteristics of the wafer of integrated circuits;
wherein the inductance value is the same for each integrated circuit on the wafer of integrated circuits.
12. A method of testing an optical receiver module, comprising:
physically attaching an optical detector directly to an integrated circuit and electrically coupling an output port of the optical detector to an input port of the integrated circuit to form the optical receiver module such that the optical detector and the integrated circuit form a closed loop circuit in which the electrical connection between the output port of the optical detector and the input port of the integrated circuit provides substantially all of the inductance in the closed loop circuit;
illuminating the optical detector with a light source;
coupling a bias voltage to the integrated circuit; and
determining a response to of the optical receiver module to evaluate a performance characteristic thereof.
13. The method of claim 12 , wherein the integrated circuit remains part of a semiconductor wafer when the illuminating, coupling and determining steps are performed.
14. The method of claim 12 , wherein the integrated circuit is cut from a semiconductor wafer before the illuminating, coupling and determining steps are performed.
15. The method of claim 12 , wherein the optical detector is physically attached and electrically coupled to the integrated circuit using a flip-chip bonding technique.
16. The method of claim 12 , wherein the output port of the optical detector is electrically coupled to the input port of the integrated circuit using a bond wire.
17. An optical receiver module, comprising:
an optical detector that includes a photosensor for receiving light and an output port for providing a photocurrent;
an integrated circuit that includes an integrated amplifier circuit and at least one integrated decoupling capacitor, the integrated circuit including an input port for receiving the photocurrent;
the optical detector being mounted directly on a surface of the integrated circuit and the output port of the optical detector being electrically coupled to the input port of the integrated circuit;
wherein the optical detector, integrated amplifier circuit and at least one integrated decoupling capacitor form a closed loop circuit.
18. The optical receiver module of claim 17 , wherein the output port of the optical detector and the input port of the integrated circuit are electrically coupled using a flip-chip bonding technique.
19. The optical receiver module of claim 18 , wherein the optical detector and the integrated circuit are physically attached by at least the flip-chip bond between the output port of the optical detector and the input port of the integrated circuit.
20. The optical receiver module of claim 17 , wherein the output port of the optical detector and the input port of the integrated circuit are electrically coupled using a wire bond.
21. The optical receiver module of claim 17 , wherein the optical detector and the integrated circuit are physically attached by an adhesive material.
22. The optical receiver module of claim 17 , wherein the closed loop circuit includes an inductance.
23. The optical receiver module of claim 22 , wherein the inductance is provided by a tuning inductor integrated within the integrated amplifier circuit.
24. The optical receiver module of claim 22 , wherein the inductance is provided by one or more wire bonds.
25. An optical receiver module, comprising:
a housing;
a plurality of header pins attached to the housing, at least one of the header pins being electrically isolated from the housing;
an aperture disposed in the housing for providing light through the housing;
an optical detector that receives light and generates photocurrent in response to received light;
an integrated circuit that receives the photocurrent and amplifies the photocurrent to generate an output signal;
the optical detector being mounted directly on a surface of the integrated circuit;
the optical detector and the integrated circuit being mounted within the housing between the plurality of header pins such that the optical detector is proximate the aperture and positioned for receiving light.
26. The optical receiver module of claim 25 , wherein the optical detector and the integrated circuit are mounted at the geometric center of the housing.
27. The optical receiver module of claim 25 , wherein the optical detector and the integrated circuit are mounted at a position in the housing that is equidistant from each of the plurality of header pins.
28. The optical receiver module of claim 25 , wherein the optical detector and the integrated circuit consume all of the populated area between the plurality of header pins.
29. The optical receiver module of claim 25 , wherein the integrated circuit includes one or more integrated capacitors.
30. The optical receiver module of claim 29 , wherein no capacitors are included within the housing external to the integrated circuit.