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US 8,610,494 B1Granted
Low power active filter
AssigneeTaiwan Semiconductor Manufacturing Company, Ltd.
InventorsJun-De Jin, Tzu-Jin Yeh
Life of this patent
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Abstract
Some embodiments relate to a band-pass filter arranged in a ladder-like structure. The band-pass filter includes respective inductor-capacitor (LC) resonators arranged on respective rungs of the ladder-like structure. Respective matching circuits are arranged on a leg of the ladder-like structure between neighboring rungs.
Claims18
A band-pass filter arranged in a ladder-like structure and comprising:
- respective inductor-capacitor (LC) resonators arranged on respective rungs of the ladder-like structure;
- and
- respective matching circuits arranged on a leg of the ladder-like structure between respective neighboring rungs;
- wherein at least one of the LC resonators is an active inductor comprising:
- a transistor having a gate terminal and first and second source/drain terminals;
- a first inductor having a first inductor terminal coupled to the first source/drain terminal;
- a second inductor having a first inductor terminal coupled to the gate terminal;
- and
- a transmission line coupled to respective second inductor terminals of the first and second inductors.
6 more elements
A band-pass filter having an input terminal and an output terminal, the band pass filter comprising:
- a first inductor-capacitor (LC) resonator having first and second LC terminals, the first LC terminal coupled to the input terminal;
- a first matching circuit having first and second terminals, the first terminal coupled to the input terminal;
- a second LC resonator having third and fourth LC terminals, the third LC terminal coupled to the second terminal of the first matching circuit;
- a second matching circuit having third and fourth terminals, the third terminal coupled to the fourth LC terminal;
- a third inductor-capacitor (LC) resonator having fifth and sixth LC terminals, the fifth LC terminal coupled to the fourth terminal of the second matching circuit;
- a third matching circuit having fifth and sixth terminals, the fifth terminal coupled to the fourth terminal of the second matching circuit;
- and
- a fourth LC resonator having seventh and eight LC terminals, the seventh LC terminal coupled to the sixth terminal and to the output terminal of the band-pass filter;
- wherein at least one of the LC resonators includes an active inductor comprising:
- a transistor having a gate terminal and first and second source/drain terminals;
- a first inductor having a first inductor terminal coupled to the first source/drain terminal;
- and
- a second inductor having a first inductor terminal coupled to the gate terminal.
10 more elements
Dependencies are inferred from the claim text.