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US 6,600,390 B2Granted
Differential filters with common mode rejection and broadband rejection
AssigneeAgilent Technologies, Inc.
InventorMichael Louis Frank
Life of this patent
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Abstract
A differential filter includes a first input, a second input, a first output, a second output, and a plurality of acoustic resonator elements. The plurality of acoustic resonator elements is connected to the first input, the second input, the first output and the second output. The acoustic resonator elements are arranged to form at least two of a lattice structure, a full ladder structure and a paired half ladder structure.
Claims19
A differential filter comprising:
- a first input;
- a second input;
- a first output;
- a second output;
- and,
- a plurality of acoustic resonator elements, coupled to the first input, the second input, the first output and the second output, the acoustic resonator elements being arranged to form both a lattice structure and a full ladder structure.
3 more elements
A differential filter comprising:
- a first input;
- a second input;
- a reference voltage input;
- a first output;
- a second output;
- and,
- a plurality of acoustic resonator elements, coupled to the first input, the second input, the first output and the second output, the acoustic resonator elements being arranged to form both a lattice structure and a paired half ladder structure.
4 more elements
A differential filter comprising:
- a first node;
- a second node;
- a reference voltage input;
- a first output;
- a second output;
- and,
- a plurality of acoustic resonator elements, coupled to the first node, the second node, the first output and the second output, the acoustic resonator elements being arranged to form both a full ladder structure and a paired half ladder structure, wherein the plurality of acoustic resonator elements includes:
- a first acoustic resonator element connected between the first node and the second node,
- a second acoustic resonator element connected between the first node and a third node,
- a third acoustic resonator element connected between the second node and a fourth node,
- a fourth acoustic resonator element connected between the third node and the fourth node,
- a fifth acoustic resonator element connected between the first output and the third node,
- a sixth acoustic resonator element connected between the second output and the fourth node,
- a seventh acoustic resonator element connected between the first output and the reference voltage input, and
- an eighth acoustic resonator element connected between the second output and the reference voltage input.
12 more elements
A differential filter comprising:
- a first node;
- a second node;
- a reference voltage input;
- a first output;
- a second output;
- and,
- a plurality of acoustic resonator elements, coupled to the first node, the second node, the first output and the second output, the acoustic resonator elements being arranged to form both a full ladder structure and a paired half ladder structure, wherein the first node is a first circuit input, the second node is a second circuit input, and the plurality of acoustic resonator elements includes:
- a first acoustic resonator element connected between the first node and the second node,
- a second acoustic resonator element connected between the first node and a third node,
- a third acoustic resonator element connected between the second node and a fourth node,
- a fourth acoustic resonator element connected between the third node and the fourth node,
- a fifth acoustic resonator element connected between a fifth node and the third node,
- a sixth acoustic resonator element connected between a sixth node and the fourth node,
- a seventh acoustic resonator element connected between the fifth node and the reference voltage input,
- an eighth acoustic resonator element connected between the sixth node and the reference voltage input,
- a ninth acoustic resonator element connected between the fifth node and the first output,
- a tenth acoustic resonator element connected between the sixth node and the second output,
- an eleventh acoustic resonator element connected between the first output and the reference voltage input, and
- a twelfth acoustic resonator element connected between the second output and the reference voltage input.
16 more elements
A differential filter as in claim wherein each of the acoustic resonator elements is a surface acoustic wave (SAW) element.
Dependencies are inferred from the claim text.