Semiconductor device having MIM structure resistor
View Patent ↗As for the resistor on the semiconductor substrate, it is required to achieve obtaining a metal resistor, which can be formed in the latter half of a preliminary process for manufacturing a semiconductor, in addition to forming a polysilicon resistor, which is formed in the first half of the preliminary process. A capacitor having MIM structure comprises a lower electrode, a capacitive insulating film and an upper electrode, all of which are sequentially formed in this sequence. A resistor structure having MIM structure also comprises a lower electrode, a capacitive insulating film and a resistor, all of which are sequentially formed in this sequence. In this case, the biasing conditions thereof should be selected so that the resistor structure lower electrode of the MIM structure resistor is not coupled to any electric potential, and is in a floating condition. Therefore, even if the signal of higher frequency is applied to the metal resistor, the resistor structure lower electrode is hardly affected by the parasitic capacitance thereof due to its floating condition, thereby providing improved high frequency characteristics of the device including such metal resistor.
1. A semiconductor device comprising:
a semiconductor substrate;
a capacitor, which is provided on said semiconductor substrate and comprises a metal upper electrode, a metal lower electrode and a dielectric sandwiched by said metal upper electrode and said metal lower electrode; and
a resistor structure provided on said semiconductor substrate,
wherein said resistor structure comprises a metal upper electrode, a metal lower electrode and a dielectric sandwiched by said metal upper electrode and said metal lower electrode, all simultaneously formed with said capacitor, and further comprises two separated resistor terminals contacting with said metal upper electrode, thereby forming said metal upper electrode disposed between said two separated resistor terminals as a resistor.
2. The semiconductor device according to claim 1 , wherein said metal lower electrode of said resistor structure has a floating potential.
3. The semiconductor device according to claim 1 , wherein said metal lower electrode of the capacitor and said metal lower electrode of the resistor structure have geometries, in which said metal upper electrode of the capacitor and said metal upper electrode of the resistor structure are two-dimensionally included, respectively.
4. The semiconductor device according to claim 1 , wherein said metal lower electrode of the capacitor is coupled to a capacitor lower electrode pick-up interconnect, which is located upper than said metal upper electrode of the capacitor.
5. The semiconductor device according to claim 1 , wherein said metal lower electrode, said dielectric and said metal upper electrode of the resistor structure have a common two-dimensional geometry.
6. The semiconductor device according to claim 1 , wherein said metal lower electrode, said dielectric and said metal upper electrode of the capacitor have a common two-dimensional geometry.
7. The semiconductor device according to claim 1 , wherein a terminal for the upper electrode contacting with said metal upper electrode of said capacitor is provided simultaneously with providing said two separated resistor terminals contacting with said metal upper electrode.
8. The semiconductor device according to claim 1 , wherein a terminal for the upper electrode contacting with said metal upper electrode of the capacitor and a terminal for the lower electrode contacting with said metal lower electrode of the capacitor are provided simultaneously with providing said resistor terminal.
9. The semiconductor device according to claim 1 , wherein said metal lower electrode of the resistor and said metal lower electrode of the capacitor are positioned at a same level as a level of one interconnect layer of multi-layered interconnects provided on said semiconductor substrate.
10. The semiconductor device according to claim 1 , further comprising a drawing electrode provided to couple to said metal lower electrode and positioned at a same level as a level of said lower electrode.
11. The semiconductor device according to claim 1 , further comprising a drawing electrode provided to contact said metal lower electrode and positioned under said metal lower electrode, wherein said drawing electrode has an area, which is narrower than an area of said metal lower electrode.
12. The semiconductor device according to claim 11 , wherein a geometry of said drawing electrode is a lattice shape.
13. The semiconductor device according to claim 11 , further comprising contacts for coupling said drawing electrode and said metal lower electrode, said contacts being provided on an upper surface of said metal lower electrode to be arranged at generally even spacings.
14. The semiconductor device according to claim 1 , further comprising a shield electrode under said metal lower electrode, wherein said shield electrode has a floating potential.
15. The semiconductor device according to claim 14 , wherein said shield electrode is grounded.