Single-chip control circuit of radiofrequency amplifying circuit of C and Ku wave bands of satellite television signals

A technology for controlling circuits and satellite TVs, applied in color TV components, TV system components, TVs, etc., can solve problems such as increasing system cost, volume, and large PCB area, and achieve the effect of avoiding excessive current.

Inactive Publication Date: 2011-01-12
WUXI CRYSTAL SOURCE MICROELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These separate components or ICs are on a large PCB, occupying a

Method used

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  • Single-chip control circuit of radiofrequency amplifying circuit of C and Ku wave bands of satellite television signals
  • Single-chip control circuit of radiofrequency amplifying circuit of C and Ku wave bands of satellite television signals
  • Single-chip control circuit of radiofrequency amplifying circuit of C and Ku wave bands of satellite television signals

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Embodiment Construction

[0019] The monolithic control IC of satellite TV signal C in the present invention, Ku band radio frequency amplifying circuit comprises: carry out polarization control 1 according to the level of voltage, output horizontal polarization control signal 2 to control high-amplitude D1, vertical polarization control signal 3 controls High amplifier D2, the signal is amplified by high amplifier D3 and enters the mixer DM. The 22kHz signal passes through the band-pass filter 4 to reduce interference, and then passes through the comparator 5 to control the local oscillation (Low band oscillator and high band oscillator). After the signal is mixed, it enters the intermediate amplifier. Among them, the integrated circuit we designed provides the feedback voltage-current source 6 required by the first amplifier D1, the second amplifier D2, the third amplifier D3, and the mixer DM, the first amplifier D1, the second amplifier D2, and the third amplifier D3 , The negative voltage source ...

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Abstract

The invention discloses a single-chip control integrated circuit of a radiofrequency amplifying circuit of C and Ku wave bands of satellite television signals, the control circuit comprises a polarization controller (1), a horizontal polarization control signal (2), a vertical polarization control signal (3), a band-pass filter (4), a comparator (5), a feedback voltage-current source (6), a negative voltage source (7) and a low PSRR LDO (8), wherein an output end of the polarization controller (1) outputs the horizontal polarization control signal (2) and is connected with an input end of a first amplifier (D1), an output end of the polarization controller (1) outputs the vertical polarization control signal (3) and is connected with an input end of a second amplifier (D2), output ends of the first amplifier (D1) and the second amplifier (D2) are merged and are then connected with an input end of a third amplifier (D3), and an output end of the third amplifier (D3) is connected with an intermediate-frequency amplifier (IF) through a frequency mixer (DM); and an output end of the band-pass filter (4) is connected with an input end of the comparator (5), and an output end of the comparator (5) is connected with the frequency mixer (DM) through a low band local oscillator (LB OSC) and a high band local oscillator (HB OSC) which are connected in parallel.

Description

technical field [0001] The invention is a control integrated circuit of satellite TV signal C and Ku band radio frequency amplifier circuit, which provides the voltage-current source required by the radio frequency amplifier circuit system, and has sampling, over-current protection and over-temperature protection, especially in a The integration of controllable positive and negative power supplies is realized on the chip, and different polarity control modes and oscillation control are provided. Background technique [0002] GaAs devices are used in most satellite TV signal C and Ku band amplifiers. [0003] At present, the typical application circuit board (PCB) adopts a block control method for the satellite TV signal C and Ku band RF amplifier circuit system: some circuits (or separate components) provide the bias control and protection control required by the amplifier circuit, and some The circuit (or separate components) provides the control negative pressure required...

Claims

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Application Information

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IPC IPC(8): H04N5/44H04N7/22
Inventor 聂卫东陈东勤盛慧红尹岱马晓辉
Owner WUXI CRYSTAL SOURCE MICROELECTRONICS CO LTD
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