Metal trim mirror for optimized thin film resistor laser trimming
AssigneeMaxim Integrated Products, Inc.
InventorsRalph Wall, Karl Robinson
Life of this patent
Estimating the term…
Loading patent…
AssigneeMaxim Integrated Products, Inc.
InventorsRalph Wall, Karl Robinson
Estimating the term…
A device and a method of forming the device are disclosed. The device includes a reflector, a first dielectric layer disposed on the reflector, and a thin film resistor disposed on the reflector. The reflector acts as a barrier between the thin film resistor and an underlying dielectric layer which may have a non-uniform thickness. Thus, the thickness control and uniformity of the dielectric layer underlying the reflector does not affect the laser trimming of the thin film resistor. In addition to serving as a barrier, the reflector reflects the trimming laser energy back towards the thin film resistor, thereby improving the efficiency of the laser trimming of the thin film resistor. Furthermore, the thickness of the first dielectric layer situated below the thin film resistor and above the reflector can be easily controlled to substantially optimize the laser trimming efficiency of the thin film resistor.
1-3. (Canceled)
The device of claim 30 wherein said reflector substantially reflects a laser energy used to laser trimming said thin film resistor.
The device of claim 30, wherein the thickness of said first dielectric layer is at a pre-determined thickness range which optimizes the laser trimming of said thin film resistor.
The device of claim 30, wherein said first dielectric layer comprises silicon dioxide (SiO2) and/or silicon nitride (Si3N4).
The device of claim 30, wherein said thin film resistor comprises chromium silicon (CrSi), nickel chromium (NiCr), and/or tantalum nitride (TaN).
The device of claim 30, further comprising a second dielectric layer disposed over the thin film resistor.
(Canceled)
The device of claim 31, wherein a plate of said MIM capacitor is the same layer as that of said reflector.
14-15. (Canceled)
The method of claim 32, wherein said reflective layer comprises a refractory metal.
The method of claim 32, further comprising directing a laser energy to trim said thin film resistor, wherein said reflector substantially reflects said laser energy towards said thin film resistor.
The method of claim 32, wherein said first dielectric layer comprises silicon dioxide (SiO2) and/or silicon nitride (Si3N4).
(Canceled)
The method of claim 33, wherein said thin film resistive layer comprises chromium silicon (CrSi), nickel chromium (NiCr), and/or tantalum nitride (TaN).
The method of claim 33 further comprising forming a second dielectric layer over said thin film resistor.
(Canceled)
The method of claim 34, wherein forming said MIM capacitor comprises:
A device comprising:
A device comprising:
A method comprising:
A method comprising:
A method comprising:
Dependencies are inferred from the claim text.