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Tuner containing selective wave filter

A technology of tuner and filter, applied in the field of tuner, which can solve problems such as poor reception of expected channels, poor image quality of video signals, high tilt, etc.

Inactive Publication Date: 2003-06-04
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The selective filtering devices described in the prior art documents are not able to meet the requirements of this type of modulation, in fact such modulation has a high inclination to channels with a bandwidth of 6-8 MHz, resulting in poor reception of the desired channel and / or poor reception of the video signal Image Quality

Method used

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  • Tuner containing selective wave filter
  • Tuner containing selective wave filter
  • Tuner containing selective wave filter

Examples

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Embodiment Construction

[0035] figure 2 The arrangement of the various processing means 114 of the present invention for filtering the IF signal 201 and providing a second IF output signal 202 is described.

[0036] The processing means 114 receives the first IF signal 201 generated by the mixer 111 described in FIG. 1 . First, the voltage follower circuit 203 receives the IF signal 201 and supplies a second IF signal 204 with low impedance. The control means 205 associated with said circuit 203 allow controlling the bias current of the voltage follower circuit in order to ensure a linear operation of the elements constituting said circuit. Second, the second IF signal 204 is filtered by a filter 206 having a double resonant frequency to produce the IF output signal 202 . By virtue of its selectable nature, the filter 206 allows the elimination of residual frequency components in the signal 204 from channels adjacent to the selected frequency channel.

[0037] image 3 Shown is a first embodiment...

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Abstract

The radio frequency tuner has a voltage following circuit receiving the first intermediate frequency signal and generating a second low impedance signal. A current regulator regulates the voltage following circuit and a resonant double frequency filter filters the second intermediate frequency signal and generates the output intermediate frequency signal.

Description

technical field [0001] The invention relates to a tuner for converting an RF (radio frequency) signal into an IF (intermediate frequency) output signal, said tuner comprising a mixer for generating a first IF signal, a filter for said first IF signal and processing means for generating said IF output signal. [0002] The invention finds many applications in systems that receive RF signals. Background technique [0003] The function of the tuner is to select a data signal located at a certain frequency center of the RF input signal and convert the selected signal into an IF output signal. The data signal defines the channel. Tuners are currently used in radio and television equipment, or in general, in equipment that processes modulated input signals for the transmission of multimedia data. [0004] Figure 1 describes the different functional blocks of a tuner known from the prior art. [0005] The tuner comprises filtering means 101 for receiving an RF signal 102 and pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/26H03H7/01H03J3/00
CPCH04N5/50H03H7/427H03J2200/32H03H7/075H03H7/0115H03H7/1733H03H7/425H03J3/00
Inventor S·阿米奥特J·-M·帕里斯L·扎伊德
Owner NXP BV