Interdigitated rf filter
AssigneepSemi Corporation
InventorMichael P. GAYNOR
Life of this patent
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Abstract
An interdigitated RF filter. The interdigitated RF filter includes input fingers connected to an input node and output fingers connected to an output node where at least one input finger is connected the output node or at least one output finger is connected to the input node. The described interdigitated RF filter can be implemented in various configurations such as series, shunt, ladder or a combination thereof.
Claims25
A radio frequency (RF) interdigitated filter comprising:
- a plurality of input fingers connected to an input node;
- a plurality of output fingers connected to an output node, and
- input connections between at least two of the input fingers, and output connections between at least two of the output fingers;
- wherein at least one output finger is connected to the input node, and/or at least one input finger is connected to the output node, and wherein the plurality of input fingers and the plurality of output fingers are made from a first metal layer, and the input connections and the output connections are made from a second metal layer.
4-5. (canceled)
A radio frequency (RF) interdigitated filter comprising:
- a plurality of input fingers connected to an input node;
- and
- a plurality of output fingers connected to an output node,
- wherein at least one output finger is connected to the input node, and/or at least one input finger is connected to the output node, the RF interdigitated filter being implemented in a shunt configuration wherein either the input node or output node is connected to ground.
A radio frequency (RF) interdigitated filter comprising:
- a plurality of input fingers connected to an input node;
- and
- a plurality of output fingers connected to an output node,
- wherein at least one output finger is connected to the input node, and/or at least one input finger is connected to the output node, the RF interdigitated filter being implemented as part of a digitally tunable capacitor (DTC) or digitally tunable inductor (DTL).
A method of filtering a signal comprising:
- providing, between an input node and an output node, an electronic structure by interleaving a plurality of input fingers connected to the input node with a plurality of output fingers connected with the output node;
- connecting at least one output finger to the input node or at least one input finger the output node;
- applying the signal at the input node, thereby filtering the signal to generate a filtered signal at the output node;
- and
- connecting two or more of the input fingers together and connecting two or more of the output fingers together,
- wherein the plurality of input fingers and the plurality of output fingers are made from a first metal layer, and the connecting of the two or more input fingers together and the connecting of the two or more output fingers together are performed using a second metal layer.
(canceled)
23-24. (canceled)
A radio frequency (RF) interdigitated filter implemented in an integrated circuit including a silicon substrate, the RF interdigitated filter comprising:
- a plurality of input fingers connected to an input node;
- and
- a plurality of output fingers connected to an output node,
- wherein the plurality of input fingers and the plurality of output fingers are made from one or more metal layers of the integrated circuit on the silicon substrate;
- and
- wherein at least one output finger is connected to the input node, and/or at least one input finger is connected to the output node.
Dependencies are inferred from the claim text.