Time delay filters

Patent metadata

Field	Value
Publication number	US-10050597-B2
Application number	US-201715652643-A
Country	US
Kind code	B2
Filing date	Jul 18, 2017
Priority date	Dec 16, 2015
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

A time delay filter comprising a substrate; four coupled LC resonators, each having a coupling point; a first capacitor that electrically couples the first coupling point to the second coupling point; a second capacitor that electrically couples the second coupling point to the third coupling point; and a third capacitor that electrically couples the third coupling point to the fourth coupling point; the filter group delaying a signal output at the fourth coupling point relative to a signal input at the first coupling point.

First claim

We claim:

1. A time delay filter comprising:
a substrate comprising a conductive ground region;
a first LC resonator coupled to the substrate and comprising:
a first coupling point,
a first capacitive element electrically coupled between the first coupling point and the ground region, and
a first inductive element electrically coupled between the first coupling point and the ground region;

a second LC resonator coupled to the substrate and comprising:
a second coupling point,
a second capacitive element electrically coupled between the second coupling point and the ground region, and
a second inductive element electrically coupled between the second coupling point and the ground region;

a third LC resonator coupled to the substrate and comprising:
a third coupling point,
a third capacitive element electrically coupled between the third coupling point and the ground region, and
a third inductive element electrically coupled between the third coupling point and the ground region;

a fourth LC resonator coupled to the substrate and comprising:
a fourth coupling point,
a fourth capacitive element electrically coupled between the fourth coupling point and the ground region, and
a fourth inductive element electrically coupled between the fourth coupling point and the ground region;

a first capacitor that electrically couples the first coupling point to the second coupling point;
a second capacitor that electrically couples the second coupling point to the third coupling point; and
a third capacitor that electrically couples the third coupling point to the fourth coupling point;

wherein the filter group delays a signal output at the fourth coupling point relative to a signal input at the first coupling point; wherein the substrate comprises a first surface, a second surface substantially parallel to the first surface, and a volume between the first and second surfaces; wherein the first, second, third, and fourth capacitive elements are buried capacitors within the substrate volume; wherein the first, second, and third capacitors are surface capacitors on the first surface of the substrate; wherein first and second sides of the first capacitive element are separated by a dielectric layer of the substrate, wherein the dielectric layer comprises hafnium oxide.

2. The time delay filter of claim 1 , wherein the first, second, third, and fourth LC resonators are arranged on the substrate in a horseshoe pattern or in a meander pattern.

3. The time delay filter of claim 2 , wherein the first inductive element is adjacent the fourth inductive element and the first and fourth inductive elements are magnetically coupled during operation of the time delay filter; wherein the first and fourth LC resonators are not directly capacitively coupled.

4. The time delay filter of claim 3 , further comprising:
a fifth LC resonator coupled to the substrate and comprising:
a fifth coupling point,
a fifth capacitive element electrically coupled between the fifth coupling point and the ground region, and
a fifth inductive element electrically coupled between the fifth coupling point and the ground region;

a sixth LC resonator coupled to the substrate and comprising:
a sixth coupling point,
a sixth capacitive element electrically coupled between the sixth coupling point and the ground region, and
a sixth inductive element electrically coupled between the sixth coupling point and the ground region; and

a fourth capacitor that electrically couples the fourth coupling point to the fifth coupling point; and
a fifth capacitor that electrically couples the fifth coupling point to the sixth coupling point.

5. The time delay filter of claim 4 , wherein the first, second, third, fourth, fifth, and sixth LC resonators are arranged on the substrate in a meander pattern.

6. The time delay filter of claim 5 , wherein the third inductive element is adjacent the sixth inductive element and the third and sixth inductive elements are magnetically coupled during operation of the time delay filter; wherein the third and sixth LC resonators are not directly capacitively coupled.

7. The time delay filter of claim 1 , wherein the first, second, third, and fourth LC resonators are arranged in a zig-zag pattern.

8. The time delay filter of claim 7 , wherein the first inductive element is adjacent the third inductive element and the first and third inductive elements are magnetically coupled during operation of the time delay filter; wherein the first and third LC resonators are not directly capacitively coupled.

9. The time delay filter of claim 8 , wherein the second inductive element is adjacent the fourth inductive element and the second and fourth inductive elements are magnetically coupled during operation of the time delay filter; wherein the second and fourth LC resonators are not directly capacitively coupled.

10. The time delay filter of claim 1 , wherein the first inductive element comprises:
a first conductive region coupled to the first surface of the substrate;
a second conductive region coupled to the second surface of the substrate;
a first via that is electrically coupled to and extends between the first and second conductive region;
a second via that is electrically coupled to and extends between the first conductive region and a first portion of the first capacitive element; and
a third via that is electrically coupled to and extends between the second conductive region and a second portion of the first capacitive element;

wherein the first conductive region, the first via, the second conductive region, the second via, the first capacitive element, and the third via form a loop.

11. A time delay filter comprising:
a substrate comprising a conductive ground region;
a first LC resonator coupled to the substrate and comprising:
a first coupling point,
a first capacitive element electrically coupled between the first coupling point and the ground region, and
a first inductive element electrically coupled between the first coupling point and the ground region;

a second LC resonator coupled to the substrate and comprising:
a second coupling point,
a second capacitive element electrically coupled between the second coupling point and the ground region, and
a second inductive element electrically coupled between the second coupling point and the ground region;

a third LC resonator coupled to the substrate and comprising:
a third coupling point,
a third capacitive element electrically coupled between the third coupling point and the ground region, and
a third inductive element electrically coupled between the third coupling point and the ground region;

a fourth LC resonator coupled to the substrate and comprising:
a fourth coupling point,
a fourth capacitive element electrically coupled between the fourth coupling point and the ground region, and
a fourth inductive element electrically coupled between the fourth coupling point and the ground region;

a fifth LC resonator coupled to the substrate and comprising:
a fifth coupling point,
a fifth capacitive element electrically coupled between the fifth coupling point and the ground region, and
a fifth inductive element electrically coupled between the fifth coupling point and the ground region;

a sixth LC resonator coupled to the substrate and comprising:
a sixth coupling point,
a sixth capacitive element electrically coupled between the sixth coupling point and the ground region, and
a sixth inductive element electrically coupled between the sixth coupling point and the ground region

a first capacitor that electrically couples the first coupling point to the second coupling point;

Assignees

• Kumu Networks Inc

Inventors

• Hahn Wilhelm Steffen
• Riddle Alfred
• Landi Ernie

Classifications

• H10W90/759

  between a chip and a laterally-adjacent discrete passive device · CPC title

• H03H7/345

  Adjustable networks · CPC title

• H03H7/34

  with lumped and distributed reactance · CPC title

• H03H7/1708

  Comprising bridging elements, i.e. elements in a series path without own reference to ground and spanning branching nodes of another series path (H03H7/07 takes precedence) · CPC title

• H03H7/1775

  Parallel LC in shunt or branch path (H03H7/1791 takes precedence) · CPC title