Patterned capacitor ground shield for inductor in an integrated circuit
View Patent ↗Integrated circuits are disclosed including at least one inductor-capacitor component, where each of the inductor-capacitor components includes an inductor and a capacitor constructed between the inductor and a substrate. The inductor includes at least one metal loop over a shield pattern forming a first capacitor terminal over patterned oxide layer with a second capacitor layer between the patterned oxide layer and the substrate.
1. An integrated circuit, comprising at least one inductor-capacitor component further comprising an inductor, and a capacitor disposed between said inductor and a substrate,
wherein said inductor includes a first inductor terminal coupled through at least one metal loop to a second inductor terminal over a shield pattern layer, said shield pattern layer separated by an oxide pattern layer from said substrate, said shield pattern layer including a gate of a transistor; and
wherein said capacitor includes a first capacitor terminal as said shield pattern layer and a second capacitor layer disposed between said substrate and a boundary of at least one of said shield pattern layer and said oxide pattern layer.
2. The integrated circuit of claim 1 , wherein said shield pattern layer is composed of polysilicon.
3. The integrated circuit of claim 1 , wherein said oxide pattern layer is composed from a thin oxide layer belonging to a collection of oxide layers in said integrated circuit, including at least one oxide layer that is thicker than said thin oxide layer.
4. The integrated circuit of claim 3 , wherein said thin oxide layer is the thinnest of said oxide layers in said integrated circuit.
5. The integrated circuit of claim 1 , wherein said metal loop comprises at least one metal layer separated by at least one layer of inter-metal dielectric from said shield pattern layer.
6. The integrated circuit of claim 5 , wherein said metal loop further comprises at least two metal layers electrically coupled by at least one via.
7. The integrated circuit of claim 1 , wherein said integrated circuit is a CMOS integrated circuit.
8. The integrated circuit of claim 1 , wherein said integrated circuit is a gallium arsenide integrated circuit.
9. The integrated circuit of claim 1 , further comprising an RC filter comprising a resistor coupled to said capacitor.
10. The integrated circuit of claim 1 , wherein said inductor-capacitor component is configured as a parallel LC circuit
with said first inductor terminal electrically coupled to said first capacitor terminal and
with said second inductor terminal electrically coupled to said second capacitor layer.
11. The integrated circuit of claim 1 , wherein said inductor-capacitor component is configured as a series LC circuit
with a first terminal as said second inductor terminal and a second terminal as said second capacitor layer and
with said first inductor terminal electrically coupled to said first capacitor terminal.