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Broadband mixing apparatus for hand-held digital video broadcast frequency modulator chip

A technology of digital video broadcasting and mixer, applied in the parts of color TV, parts of TV system, TV, etc., can solve the problems of unsuitability for mobile terminals and high power consumption, etc.

Inactive Publication Date: 2007-10-03
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although DVB-T performs very well in the mobile environment of high bit rate transmission, it is not suitable for mobile terminals powered by batteries due to relatively large power consumption.

Method used

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  • Broadband mixing apparatus for hand-held digital video broadcast frequency modulator chip
  • Broadband mixing apparatus for hand-held digital video broadcast frequency modulator chip

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Experimental program
Comparison scheme
Effect test

Embodiment

[0033] The design steps of the broadband mixer applied to the handheld digital video broadcasting frequency modulator chip are as follows:

[0034] 1. Design the mixer input stage and its bias. First, use a cascode structure amplifier, use ideal bias, and use infinite inductance as the AC load, find out the bias point that satisfies its optimal noise figure, and use it as the DC bias reference point for the mixer input.

[0035] Under certain bias and transistor size conditions, there is an optimal noise figure for transistors. It can be obtained from formula 1:

[0036] NF min ( J C ) = 1 + n β DC + 2 J C V T ...

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PUM

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Abstract

This invention relates to a broadband mixer used in chips of handheld digital video broadcast frequency modulators including: a Gilbert dual-balance mixer structure, a degenerated resistor structure, one end of which is connected to the earth and the other end is connected with the emission pole of the RF input end of the mixer, a load structure injected with current, and the input of which is connected with the output of the mixer structure to separate the current to the load resistor originally so as to lead in rather big resistance to secure the gain of the mixer, a low-pass filter structure, one end of which is connected with the output of the mixer structure and the other end is connected to the earth in AC to filter the unecessary frequency components generated in mixing, mainly the frequency got from converting IF signals and intrinsic signals.

Description

technical field [0001] The invention relates to the technique of realizing high linearity, high gain, low noise and filtering in wideband (470MHz-860MHz) of a mixer (Mixer). Background technique [0002] The digital television terrestrial standard (DVB-T) was released in 1997. Although DVB-T performs very well in a high bit rate transmission mobile environment, it is not suitable for mobile terminals powered by batteries due to relatively large power consumption. Around 2002, Europe began to study DVB-H, which is called Digital Video Broadcasting Handheld. DVB-H enables portable devices such as mobile phones to receive TV through the technology of reducing power consumption. Generally speaking, the power consumption of the receiving part of DVB-H mobile phone can be less than 100mW, while DVB-T plans to reduce this index to 600mW in 2007. [0003] In the DVB-H mobile phone receiving chip, the front-end high-frequency tuner, the so-called tuner (tuner) is an essential part...

Claims

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Application Information

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IPC IPC(8): H04N5/50
Inventor 毛威石寅代伐
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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