Filter for laminated circuit assembly
AssigneeGoogle Inc.
InventorsJohn Martinis, Bob Benjamin Buckley, Xiaojun Trent Huang
Life of this patent
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Abstract
A laminated circuit assembly for filtering signals in one or more signal lines in, for instance, a quantum computing system is provided. In one example, the laminated circuit assembly includes one or more signal lines disposed within a substrate in a first direction. The laminated circuit assembly includes a dielectric portion of the substrate. The laminated circuit assembly includes a filter portion of the substrate extending in a first direction and containing a frequency absorbent material providing less attenuation to a first signal of a first frequency than to a second signal of a second, higher frequency. The filter portion is configured to attenuate infrared signals passing through the one or more signal lines.
Claims19
A laminated circuit assembly, comprising:
- one or more signal lines disposed within a substrate in a first direction;
- a dielectric portion of the substrate;
- and
- a filter portion of the substrate extending in the first direction and containing a frequency absorbent material providing less attenuation to a first signal of a first frequency than to a second signal of a second, higher frequency;
- wherein the filter portion is configured to attenuate infrared signals passing through the one or more signal lines, and
- wherein the filter portion comprises boundaries defined by a cavity formed within the dielectric portion, wherein the cavity exposes at least one portion of the one or more signal lines, and wherein the cavity is at least partially filled with the frequency absorbent material such that the frequency absorbent material is in physical contact with the at least one portion of the one or more signal lines.
A method for manufacturing a filter for a signal line, comprising receiving a laminated circuit assembly comprising one or more signal lines disposed in a first direction within a dielectric material of a substrate, wherein a second direction is normal to the substrate and a third direction is orthogonal to the first direction and the second direction;
- forming a cavity within the substrate by removing a portion of the dielectric material above the signal line in the second direction, the cavity extending in the first direction along the signal line, wherein the cavity exposes at least one portion of the one or more signal lines;
- and
- filling the cavity with a frequency absorbent material such that the frequency absorbent material is in physical contact with the at least one portion of the one or more signal lines, wherein the frequency absorbent material provides less attenuation to a first signal of a first frequency than to a second signal of a second, higher frequency, wherein the filled cavity is configured to attenuate infrared signals passing through the one or more signal lines.
A cryogenic cooling system, comprising:
- a plurality of cooling stages configured to cool a cooled portion of a computing system to a temperature of less than about 3 Kelvin;
- one or more signal lines coupling a control unit to the cooled portion of the computing system;
- and
- a laminated circuit assembly, comprising:
- one or more signal lines disposed within a substrate in a first direction;
- a dielectric portion of the substrate;
- and
- a filter portion of the substrate extending in the first direction and containing a frequency absorbent material providing less attenuation to a first signal of a first frequency than to a second signal of a second, higher frequency;
- wherein the filter portion is configured to attenuate infrared signals passing through the one or more signal lines, and
- wherein the filter portion comprises boundaries defined by a cavity formed within the dielectric portion, wherein the cavity exposes at least one portion of the one or more signal lines, and wherein the cavity is at least partially filled with the frequency absorbent material such that the frequency absorbent material is in physical contact with the at least one portion of the one or more signal lines.
Dependencies are inferred from the claim text.