Integrated channel filter using multiple resonant filters and method of operation
AssigneeMicrotune (Texas), L.P.
InventorsPhilip Hisayasu, Michael Womac
Life of this patent
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Abstract
A circuit includes a first filter comprising a first inductor coupled to a first variable capacitor, wherein the first filter is associated with a first resonant frequency. The circuit further comprises an amplifier coupled to the first filter and a second filter coupled to the amplifier. The second filter comprises a second inductor coupled to a second variable capacitor, wherein the second filter is associated with a second resonant frequency that is substantially the same as the first resonant frequency. At least a portion of the first filter and at least a portion of the second filter are formed on an integrated circuit.
Claims23
A circuit, comprising:
- a first filter comprising a first inductor coupled to a first variable capacitor, wherein the first filter is associated with a first resonant frequency;
- an amplifier coupled to the first filter;
- and
- a second filter coupled to the amplifier and comprising a second inductor coupled to a second variable capacitor, wherein the second filter is associated with a second resonant frequency that is substantially the same as the first resonant frequency;
- wherein at least a portion of the first filter and at least a portion of the second filter are formed on an integrated circuit.
A circuit, comprising:
- a first filter comprising a first inductor coupled to a first variable capacitor, wherein the first filter is associated with a first resonant frequency;
- an amplifier coupled to the first filter;
- a second filter coupled to the amplifier and comprising a second inductor coupled to a second variable capacitor, wherein the second filter is associated with a second resonant frequency that is substantially the same as the first resonant frequency;
- an emitter follower circuit coupled to the second filter and operable to buffer the output of the second filter from capacitive loading;
- and
- a tuner communicatively coupled to the emitter follower circuit;
- wherein at least a portion of the first filter, at least a portion of the second filter, and at least a portion of the tuner are formed on an integrated circuit.
A circuit, comprising:
- a transistor having a first terminal to receive an input signal, a second terminal, and a third terminal;
- a first inductor having a first lead coupled to the second terminal of the transistor and a second lead;
- a first variable capacitor coupled to the second lead of the first inductor;
- a second variable capacitor communicatively coupled to the third terminal of the transistor;
- a second inductor having a first lead coupled to a power source and a second lead coupled to the third terminal of the transistor;
- wherein the first inductor and the first variable capacitor form a first filter having a first resonant frequency, and the second inductor and the second variable capacitor form a second filter having a second resonant frequency that is substantially equal to the first resonant frequency.
Dependencies are inferred from the claim text.