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Cable TV. tuner and one-chip integrated circuit used by it

A monolithic integrated circuit and cable TV technology, applied to color TV parts, TV system parts, TVs, etc., can solve the problems of increasing the overall cost of CATV tuners, increasing costs, etc.

Inactive Publication Date: 2003-10-01
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this adds to the cost of the extra part, and in addition, requires stationary operation, adding to the overall cost of the CATV tuner
In addition, the metal plate inserted between the isolated cell and the cover also adds to the overall cost

Method used

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  • Cable TV. tuner and one-chip integrated circuit used by it
  • Cable TV. tuner and one-chip integrated circuit used by it
  • Cable TV. tuner and one-chip integrated circuit used by it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037] figure 1 is a schematic diagram of a CATV tuner 100 according to a preferred embodiment of the present invention, figure 2 is a circuit block diagram of the CATV tuner 100 . exist figure 1 and figure 2 in, with Figure 4 and Figure 5 Like parts shown are identified with like reference numerals.

[0038] CATV tuner 100 includes a metal housing 102 . The metal box 102 is divided into five isolated chambers 102A, 102B, 102C, 102D and 102E for shielding. In the isolated compartment 102A, the data circuit 10 including the first low-pass filter 12 and the branch circuit 14 is housed. In the isolated compartment 102B, an input filter circuit including a first bandpass filter 18 and an attenuation circuit 20 is housed.

[0039] In the isolated small chamber 102C, the first local oscillation circuit 26 including the first amplifier 22 , the first mixing circuit 24 , the first PLL circuit 28 and the first voltage controlled oscillator 30 is housed. In the isolated co...

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PUM

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Abstract

A cable television tuner includes a metal cabinet having compartments isolated from first to fourth. In the first to fourth isolated cells, a data circuit, an input filter circuit, a first mixer circuit, a first local oscillator circuit, a first intermediate frequency circuit, and other components are accommodated. In the fifth isolated chamber, a second intermediate frequency circuit and an integrated circuit including a second local oscillator circuit are housed. According to such a structure, the present CATV tuner is defined as an up / down tuner. A third isolated cell containing the first local oscillator circuit and a fifth isolated cell containing the second local oscillator circuit are disposed adjacent to each other. Both the transmission line and the terminals are used by the first PLL circuit and the second PLL circuit.

Description

technical field [0001] The present invention relates to cable television (CATV) tuners and monolithic integrated circuits (ICs) used therein. In more detail, the present invention relates to an up / down tuner for converting a received signal into a first intermediate frequency, which is a higher frequency signal, and further converting the first intermediate frequency into a second an intermediate frequency, the second intermediate frequency being a lower frequency signal. The invention also relates to a monolithic IC for use in such up / down tuners. Background technique [0002] Figure 4 is a schematic diagram of an example of a known CATV tuner. The CATV tuner 1 includes a metal case 2 . The tank 2 is divided into six isolated compartments 2A, 2B, 2C, 2D, 2E and 2F. [0003] In the isolated compartment 2A, a data circuit 10 is housed. Such as Figure 5 As shown, the data circuit 10 includes a first low-pass filter 12 and a sub-circuit 14 connected to the input portion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/26H04B1/10H04N5/56H04N7/173
CPCH04N7/102H05K9/006
Inventor 松岛明正前田洋二铁野博之
Owner MURATA MFG CO LTD
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