Active Inductor Circuits for Filtering in a Cable Tuner Circuit
a technology capacitors, which is applied in the field of active inductor circuits for filtering in a cable tuner circuit, can solve the problems of increasing power consumption of broadband amplifiers, significant amplifier power consumption, and broadband circuits, especially amplifier circuits, consuming more power than narrower band circuits,
Inactive Publication Date: 2010-06-17
INTELLECTUAL VENTURES HLDG 75
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- Abstract
- Description
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- Application Information
AI Technical Summary
Benefits of technology
This solution reduces power consumption, minimizes heat stress, and enhances the reliability of cable tuner circuits by integrating filters within a semiconductor substrate, enabling more efficient signal processing and reducing the need for external amplifiers.
Problems solved by technology
Additionally with the use of SAW filters, prior signal amplification requirements result in complications such as significant amplifier power consumption.
Furthermore, broadband circuits, especially amplifier circuits, tend to consume more power as compared to narrower band circuits.
Consequently, as the upper frequency for receivable TV signals increases, the power consumption of broadband amplifiers increases, particularly when used in combination with SAW filters.
The consequent heat stress thus unfavorably affects the functional reliability of both the tuner and any nearby elements.
Furthermore, when more electrical components that are used within tuner circuits, more signal delays are observed as well as signal artifacts.
Method used
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[0022]The prior art television (TV) tuner illustrated in FIG. 1 is shown as being state-of-the-art in a discussion of prior art U.S. Pat. No. 6,177,964, entitled “Broadband Integrated Television Tuner”.
[0023]Referring to FIG. 1, the prior art TV tuner is described as being highly miniaturized, but not fully integrated. The prior art TV tuner is intended to reside within in a single metallic shielding structure, not shown. The shielding structure houses a printed circuit board, upon which, all of the tuner components are mounted and electrically connected. Hence the prior art TV tuner is designed as a module, which is intended for mounting on various printed circuit boards to allow for direct connection of the input and output signals to appropriate terminations within a television receiving system. The metallic shielding structure prevents undesired external signals from interfering with the operation of the prior art TV tuner and prevents the prior art TV tuner from radiating signa...
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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.
Description
FIELD OF THE INVENTION[0001]The invention relates to the area of cable tuner circuits and more specifically to the area of active inductor and capacitor circuits for use in filtering within cable tuner integrated circuits.BACKGROUND OF THE INVENTION[0002]Cable tuner circuits are used to receive a television signal from a television signal provider and to tune into a single channel within the television signal in order to present audio and video information from that channel to an end user. Cable tuners that operate using a superheterodyne circuit for use in a superheterodyne method of processing television signal information are commonplace. A superheterodyne receiver converts a desired signal to an intermediate frequency (IF) for filtering using a fixed bandpass filter. Signals having been passed through the fixed bandpass filter are processed by a second primary component of the receiver. A fixed bandpass filter is preferred because the filter characteristics are more readily and ...
Claims
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IPC IPC(8): H04N5/50
CPCH03J1/005H03J3/08H04N21/4263H04N5/50H04B1/28
InventorFULGA, STEFANRAHN, DAVID
OwnerINTELLECTUAL VENTURES HLDG 75