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Tracking filter for a television tuner

一种跟踪滤波器、电容器的技术，应用在电容性衰减器的一组补偿值,装置,跟踪滤波器领域，能够解决跟踪滤波器困难等问题

Active Publication Date: 2011-01-05
SILICON LAB INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the wide frequency range over which the filter will operate and competing constraints at these different frequencies, it can be difficult to provide a filter that properly tracks

Method used

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  • Tracking filter for a television tuner
  • Tracking filter for a television tuner
  • Tracking filter for a television tuner

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Embodiment Construction

[0017] In various embodiments, tracking filters may be implemented by providing multiple tracking filters each for a different frequency range of the TV spectrum. In this way, different individuals of the filter can be optimized for the constraints presented at a given frequency range. Given the many possible input conditions, for low-cost silicon implementations of the tuner, undesired signals should be filtered before downsampling to a lower intermediate frequency (IF) occurs to reduce the dynamic range of the analog receive chain to a reasonable and silicon achievable levels. Additionally, the filter is tunable so that any desired channel frequency in the TV spectrum can be received. Embodiments may have a high figure of merit (or low bandwidth), passing only the desired signal while filtering out as many unintended channels as possible.

[0018] Embodiments may further provide magnetically differential inductor configurations that may be used to form tracking filters tha...

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Abstract

The invention relates to a tracking filter for a television tuner. In one embodiment, a set of tracking filters to be coupled between an amplifier and a mixer is provided. The tracking filters may be differently configured depending on band of operation. For example, a first set of the filters can be configured to maintain a substantially constant Q value across their operating bandwidth while a second set of the filters can be configured to maintain a substantially constant bandwidth across their operating bandwidth.

Description

Background technique [0001] As the functions available for integrated circuits continue to increase, it is possible to form a television (TV) tuner from a single integrated circuit (IC). Such a tuner may include radio frequency (RF) and baseband circuitry to receive an RF TV signal, such as a cable, terrestrial or satellite signal, downconvert the signal to baseband and perform processing on the signal to obtain a video signal for output to a display , wherein the display is, for example, a display of a system such as a flat panel TV, a computer system, a portable device, or a mobile device. [0002] As more functions are implemented on a single integrated circuit, the merging of RF and digital processing can lead to increased noise nuisance, since the general switching of digital circuits (both digital clock and digital data processing circuits) can generate harmonics and possibly interfere with the input The reception and processing of RF signals is data dependent on noise....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/50
CPCH04N5/50H03J2200/32H03J3/06H03J3/32H03J2200/10
Inventor A·A·拉菲C·辛R·孙A·卡穆拉R·克瓦尼-普尔法德A·皮奥瓦卡里P·J·范科伦兰德
Owner SILICON LAB INC
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