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Tuner of TV system and turning method

A TV tuning, TV system technology, applied in the tuner field

Inactive Publication Date: 2006-07-05
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In view of the above problems, the object of the present invention is to provide a TV tuner system and its tuning method, to overcome the problems in the prior art

Method used

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  • Tuner of TV system and turning method
  • Tuner of TV system and turning method
  • Tuner of TV system and turning method

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Embodiment Construction

[0092] It is an object according to the invention to provide a new tuner architecture suitable for integration. Figure 3A to Figure 3E ,

[0093] Figure 4A to Figure 4B and Figure 5 to Figure 8 For the embodiment of the present invention.

[0094] Figure 3A is a tuner 300 according to the first embodiment of the present invention. Such as Figure 3A As shown, the tuner includes a low noise amplifier (LNA) 302 , a quadrature generator 304 , a complex frequency mixer 306 , a polyphase filter 308 , and a channel selection filter (CSF) 310 . A low noise amplifier (LNA) 302 receives and amplifies a television signal or a radio frequency (RF) signal extracted from a predetermined channel selected from the predetermined channel. The received and amplified signal has a frequency spectrum ranging from low frequency f L to high frequency f H ,Such as Figure 3B shown. Figure 3B Also indicates the middle frequency f of one of the predetermined channels c .

[0095] The q...

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Abstract

The system consists of a low noise amplifier used to receive and amplify the TV signals, a quadrature mixer used to combine the received the amplified TV signals and generate first media frequency quadrature signal, a complex mixer used to combine the received first media frequency quadrature signal and generate a second media frequency complex mixer, a multiphase filter used to combine the second media frequency quadrature signal and generate real part of the second media quadrature signal, a channel selection filter used to combine the real part of the second media frequency quadrature signal and select the signal from the preset channels, and a media frequency variable gain amplifier used to select the signal from the preset channels.

Description

technical field [0001] The invention relates to a TV system tuner, in particular to a TV tuner with a fully integrated circuit structure and a tuning method thereof. Background technique [0002] In a television system, a tuner is usually used to take a signal from a predetermined channel, which is a wide television spectrum from about 54~860MHZ (cable TV system) or 54~806MHZ (American broadcasting system) The bandwidth of 6MHZ. The tuner also typically converts the extracted signal to a standard intermediate frequency (IF) so that subsequent devices in the television system can process the signal at the standard IF. In the United States, the standard intermediate frequency generally used is 45.75MHZ. [0003] A traditional tuner usually converts a signal in a predetermined channel to an intermediate frequency by using a mixer to mix the signal with a local oscillating signal. The mixer mixes the input signal and the local oscillating signal to generate two output signals...

Claims

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Application Information

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IPC IPC(8): H04N5/44H04N5/50H03J5/24
Inventor 吴思贤
Owner IND TECH RES INST