Tuner and pre-circuit thereof

A tuner and pre-stage technology, applied in the field of tuners, can solve the problems of single capacitor inductance, high filter quality, etc., and achieve the effect of reduced manufacturing cost and good filter quality

Active Publication Date: 2011-04-20
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to cost considerations, these three pre-filter circuits are usually implemented using only a single capacitor and inductor. In this way, although the cost is reduced, there is no high filtering quality.

Method used

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  • Tuner and pre-circuit thereof
  • Tuner and pre-circuit thereof
  • Tuner and pre-circuit thereof

Examples

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Embodiment Construction

[0019] Please refer to figure 1 , figure 1 It is a schematic diagram of a TV tuner 100 according to a preferred embodiment of the present invention. Such as figure 1 As shown, the TV tuner 100 includes a transformer 102, a first channel 110, a second channel 120, a third channel 130 and a back-end signal processing circuit 140, wherein the first channel 110 includes two low-pass filters Circuits 111_1 and 111_2, two switches SW 1_1 and SW 1_2 , an attenuator 112, two low noise amplifiers 114 and 116, and a tracking filter 117; the second channel 120 includes two high-pass filter circuits 121_1 and 121_2, two switches SW 2_1 and SW 2_2 , an attenuator 122, two low noise amplifiers 124 and 126, and a tracking filter 127; the third channel 130 includes two bandpass filter circuits 131_1 and 131_2, four switches SW3_1, SW3_2, SW3_3, SW3_4, a An attenuator 132 , two low noise amplifiers 134 and 136 , and a tracking filter 137 . In addition, the low-pass filter circuit 111_1 ...

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Abstract

The invention discloses a tuner and a pre-circuit thereof. The tuner comprises a plurality of channels, wherein at least one channel comprises a pre-filtering circuit, an amplifier and a tracking filter; the tracking filter comprises a variable capacitor and an inductor; and the variable capacitor and the inductor are coupled to an output end of the amplifier. In addition, in the tuner, at least the amplifier and the variable capacitor are arranged in a complementary metal oxide semiconductor chip. The tuner and the pre-circuit thereof have low manufacturing cost and higher filtering quality.

Description

technical field [0001] The present invention relates to a tuner, especially a tuner and its pre-stage circuit in which some or all components are fabricated on a silicon chip. Background technique [0002] In a television system, one of the functions of a tuner is to select a desired channel signal from a received broadband (broadband) television signal, and then perform subsequent signal processing on the selected channel signal. However, the currently commonly used tuner is a CAN tuner, which has a relatively large volume. In addition, the capacitor inductance filter is used in the tuner to implement the tracking filter to select the required frequency, and the capacitor in the tracking filter is a variable capacitor (varactor), however, because the signal to be processed by the tuner is Broadband (broadband) TV signals (that is, have a large frequency range), so the variable capacitor needs to have a large adjustable range, that is, a high supply voltage (about greater t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03J5/02H03J3/32H04N5/44
Inventor 王富正卢毅周忠昀
Owner MEDIATEK INC
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