Nested multi-stage polyphase filter

Patent metadata

Field	Value
Publication number	US-9584089-B2
Application number	US-201414546702-A
Country	US
Kind code	B2
Filing date	Nov 18, 2014
Priority date	Nov 18, 2013
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

A nested multi-stage polyphase filter can comprise: a first filter stage and a second filter stage. The first filter stage can be connected to the second filter stage via first through fourth intermediate connections. The first filter stage and the second filter stage can be laid out in a nested-ring layout. The first through fourth intermediate connections can be laid out so as to not cross over each other.

First claim

What is claimed is:

1. A nested multi-stage polyphase filter comprising:
a first filter stage and a second filter stage;
input ports connected to one of the first filter stage and the second filter stage; and
output ports connected to the other of the first filter stage and the second filter stage, wherein the number of input ports is not equal to the number of output ports;
wherein the first filter stage is connected to the second filter stage via intermediate connections, wherein the intermediate connections comprise a first intermediate connection, a second intermediate connection, a third intermediate connection and a fourth intermediate connection;
wherein the first filter stage and the second filter stage are laid out in a nested-ring layout; and
wherein the first intermediate connection, the second intermediate connection, the third intermediate connection, and the fourth intermediate connection do not cross over each other.

2. The nested multi-stage polyphase filter of claim 1 , wherein the first intermediate connection and third intermediate connection are 180° rotation symmetrical about a point of rotational symmetry;
wherein the second intermediate connection and the fourth intermediate connection are 180° rotation symmetrical about the point of rotational symmetry; and
wherein the first filter stage and the second filter stage are all located in the same layer as the first intermediate connection, the second intermediate connection, the third intermediate connection, and the fourth intermediate connection.

3. The nested multi-stage polyphase filter of claim 2 , further comprising M capacitors and M resistors, wherein M is a an integer equal to at least four.

4. The nested multi-stage polyphase filter of claim 3 , wherein M=four, wherein a first line of symmetry is perpendicular to a second line of symmetry and intersect at the point of rotational symmetry, wherein the M capacitors are reflection symmetrical about the first line of symmetry and the second line of symmetry, and wherein the M resistors are reflection symmetrical with each other about one of the first line of symmetry or the second line of symmetry.

5. The nested multi-stage polyphase filter of claim 4 , wherein the first line of symmetry and the second line of symmetry are in the same layer as the first, second, third, and fourth intermediate connections, and are in the same layer as the intersection of the first and second lines of symmetry, and wherein the intersection of the first and second lines of symmetry is at the center of the nested multi-stage polyphase filter.

6. The nested multi-stage polyphase filter of claim 3 , wherein M=six, wherein the first filter stage is further connected to the second filter stage via a fifth intermediate connection, and a sixth intermediate connection, and wherein the fifth intermediate connection and sixth intermediate connection are 180° rotation symmetrical about the point of rotational symmetry, wherein a first line of symmetry, a second line of symmetry, and a third line of symmetry intersect at the point of rotational symmetry, and wherein the intersection forms a 60° acute angle between the first and second lines of symmetry, the second and third lines of symmetry, and the first and third lines of symmetry.

7. The nested multi-stage polyphase filter of claim 6 , wherein the first line of symmetry, the second line of symmetry, and the third line of symmetry are in the same layer as the first, second, third, fourth, fifth, and sixth intermediate connections, and are in the same layer as the intersection of the first, second, and third lines of symmetry, and wherein the intersection of the first, second, and third lines of symmetry are at the center of the nested multi-stage polyphase filter.

8. The nested multi-stage polyphase filter claim 1 , further comprising:
center connection ports, comprising a first center connection port and a second center connection port; and
outer connection ports, comprising a first outer connection port, a second outer connection port, a third outer connection port, and a fourth outer connection port;
wherein one of: (i) the center connection ports are the input ports and the outer connection ports are the output ports; and (ii) the center connection ports are the output ports and the outer connection ports are the input ports;
wherein the first filter stage is configured in a ring and located between the center connection ports and the intermediate connections; and
wherein the second filter stage is configured in a ring and located between the intermediate connections and the outer connection ports.

9. A nested multi-stage polyphase filter comprising:
center connection ports, comprising a first center connection port and a second center connection port;
intermediate connections, comprising a first intermediate connection; a second intermediate connection; a third intermediate connection; and a fourth intermediate connection; and
outer connection ports, comprising a first outer connection port, a second outer connection port, a third outer connection port, and a fourth outer connection port;
a first filter stage, wherein the first filter stage is configured in a first ring and located between the center connection ports and the intermediate connections; and
a second filter stage, wherein the second filter stage is configured in a second ring and located between the intermediate connections and the outer connection ports;
wherein one of: (i) the center connection ports are input ports and the outer connection ports are output ports; and (ii) the center connection ports are output ports and the outer connection ports are input ports; and
wherein the nested multi-stage polyphase filter comprises more than one line of symmetry.

10. The nested multi-stage polyphase filter of claim 9 , wherein the center connection ports are 180° rotation symmetrical about a point of rotational symmetry defined by an intersection of a first line of symmetry and a second line of symmetry, wherein the first and second lines of symmetry are perpendicular to each other and lie in a plane comprising the nested multi-stage polyphase filter;
wherein the intermediate connections are 180° rotation symmetrical about the point of rotational symmetry;
wherein the outer connection ports are 180° rotation symmetrical about the point of rotational symmetry;
wherein components of the first filter stage are reflection symmetrical about the first line of symmetry and the second line of symmetry, wherein the components of the first filter stage comprise at least a first resistor or a first capacitor; and
wherein components of the second filter stage are symmetrical about the first line of symmetry and the second line of symmetry, wherein the components of the second filter stage comprise at least a second resistor or a second capacitor.

11. The nested multi-stage polyphase filter of claim 9 , wherein the first filter stage, second filter stage, and intermediate connections there-between are all located in a same substrate plane.

12. The nested multi-stage polyphase filter of claim 9 , wherein the first ring of the first filter stage comprises alternating first resistors and first capacitors and wherein the second ring of the second filter stage comprises alternating second resistors and second capacitors.

13. The nested multi-stage polyphase filter of claim 9 , wherein the first intermediate connection is connected to the second filter stage at a first inner intermediate connection port, wherein a first resistor of the second filter stage is connected between the first inner intermediate connection port and a first outer interme

Assignees

• Viasat Inc

Inventors

• Chen Qiang Richard
• Lyons Michael R

Classifications

• H03H7/06

  including resistors (H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence) · CPC title

• H03H17/0273

  Polyphase filters · CPC title

• H03H7/0123 Primary

  comprising distributed impedance elements together with lumped impedance elements · CPC title