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Single-conversion integrated circuit TV tuner

A TV tuner, integrated circuit technology, applied in TV, color TV, resonant circuit with a central processing unit, etc., can solve the problem that the decoder or demodulator cannot be shared with TDA8275

Inactive Publication Date: 2006-12-13
QUANTEK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Another integrated TV tuner (TDA8275 silicon integrated circuit tuner) was developed by Philips. The TDA8275 silicon integrated circuit tuner can provide a low intermediate frequency (low intermediate frequency, IF) signal to a back-end translation code device, however, the TDA8275 silicon integrated circuit tuner must rely on a dedicated structure to achieve the transmission of the low-IF signal
In other words, the existing decoder or demodulator (demodulator) cannot be shared with TDA8275

Method used

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  • Single-conversion integrated circuit TV tuner
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  • Single-conversion integrated circuit TV tuner

Examples

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no. 1 example

[0032] FIG. 1 shows a functional block diagram of a TV tuner circuit 100 in the first embodiment of the present invention. The TV tuner circuit 100 includes an RF signal input terminal (RF signal input), and the RF signal input terminal is coupled to an external antenna 101 . The TV tuner circuit 100 also includes a low-noise variable gain amplifier (LNA) 102 connected to a selectable band-pass filter (BPF) 103 . The selectable bandpass filter 103 is connected to a harmonic rejection mixer 105, which includes a complex output. In the following, the term "complex" is used to refer to any connection or signal that includes a cosine component (in-phase, I) and a sine component (quadrature-phase, Q). Immediately after the harmonic rejection mixer 105 is an IF polyphase filter (PPF) 106 , which is connected to a surface acoustic wave (SAW) driver 107 after the IF polyphase filter 106 . The TV tuner circuit 100 also includes a frequency divider (dividing the frequency by four) 108...

no. 2 example

[0044] see image 3 , image 3 A block diagram of a fully integrated TV tuner circuit 300 in a second embodiment of the present invention is shown. The front-end digitally controlled tracking filter used in the TV tuner circuit 300 includes an on-chip varactor or similar components.

[0045] The TV tuner circuit 300 is coupled to an external antenna 301 at the RF signal input end. The TV tuner circuit 300 includes a digitally controlled tracking filter 302 connected to a low noise variable gain amplifier 303 . The low noise variable gain amplifier 303 is connected to a harmonic rejection mixer (harmonic rejection mixer) 305, which includes complex output terminals. Similar to the first embodiment, an IF polyphase filter 306 is connected after the harmonic rejection mixer (harmonic rejection mixer) 305, and a surface acoustic wave driver 307 is connected after the IF polyphase filter 306 . The TV tuner circuit 300 also includes a frequency divider (divides the frequency by...

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Abstract

A single-conversion integrated circuit TV tuner includes a first filter coupled to an RF signal input (RF), and a harmonic rejection mixer connected to a real output of the first filter. The harmonic rejection mixer has complex output. The TV tuner further includes a polyphase filter having complex input connected to the complex output of the harmonic rejection mixer. Only a real signal is passed from the first filter to the harmonic rejection mixer.

Description

technical field [0001] The present invention relates to a TV tuner, in particular to an integrated circuit TV tuner for single or direct frequency conversion of a radio frequency signal. Background technique [0002] Broadband tuners (broadband tuners) can be applied to various consumer and commercial systems such as TVs, VCRs, etc. Broadband tuners can also be used in cable modems (cablemodem) and cable set-top boxes (cable set-top boxes) -boxes) and other more complex and sophisticated devices. [0003] As the RF front-end of broadband signals, the tuner is responsible for receiving all available channels, selecting desired channels, and filtering out other channels. Generally, these tuners operate in the frequency range of 40 to 900 megahertz (MHz) and have different performance requirements than conventional tuners. In these tuners, the frequency conversion structure is very important for the design of the tuner. [0004] World Intellectual Property Organization Publi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/50
CPCH03D7/14H03J1/005H03D2200/0086H04N5/50
Inventor 曾昭文刘炜
Owner QUANTEK
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