Active inductor circuits for filtering in a cable tuner circuit
US7756500B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2003 |
| Grant date | Jul 13, 2010 |
| Priority date | — |
| Expiry date | May 14, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4263
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An integrated front-end filter for a tuner provides an array of from several to a multitude of passbands, each for passing at least one but less than all channels designated in a band of frequencies. Each passband is exclusively selectable. The integrated front end filter includes at least one active filter unit with an active reactance element in either of fixed and variable filter configurations and a decoder coupled to said at least one active filter unit and being responsive to a control signal for selecting a one of the passbands. In one example a multitude of active filter units of fixed filter configuration provide the multitude of passbands. Each data is stored at a predetermined location and reproduced in response to a corresponding control data signal from a tuner controller. Each data characterizes one of the plurality of passbands. The filter element is switchable from one passband to another in response to the control data signal. Lower power dissipation and lesser requirements of an on-following integrated circuitry tuner permit a reduction of “off chip” connections and cost.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.