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Satellite reception control signal detection circuit

A technology for controlling signals and detecting circuits. It is used in the measurement of electrical variables, current/voltage, and television. It can solve the problems of low reliability and a large number of components, and achieve the effect of reducing the total number of components.

Active Publication Date: 2014-08-13
SUZHOU HUAXIN MICROELECTRONICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally composed of multiple discrete devices, the number of components is large and the reliability is not high

Method used

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  • Satellite reception control signal detection circuit
  • Satellite reception control signal detection circuit

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Embodiment 1

[0017] Embodiment one: if figure 1 As shown, it is the first embodiment of a satellite receiving control signal detection circuit provided by the present invention, which is a chip U1 with at least VDD pins, VSS pins, and ZENER pins. The internal circuit includes a comparator COMP1, base and The transistor PNP1 connected to the negative terminal of the comparator COMP1, the positive terminal connected to the emitter of the transistor PNP1 and the first current source i1 connected to the negative terminal of the comparator COMP1, the positive terminal connected to the negative terminal of the comparator COMP1 The second current source i2 connected with the negative terminal connected to the collector of the transistor PNP1. The peripheral circuit includes a voltage regulator circuit located between the VDD pin and the VSS pin, and a voltage regulator tube Z1 connected to the ZENER pin. The positive end of the first current source i1 is connected to the VDD pin at the same time...

Embodiment 2

[0020] Embodiment two: if figure 2 As shown, it is a second embodiment of a satellite receiving control signal detection circuit combined with a current source circuit provided by the present invention, which is roughly similar in structure to the first embodiment, and it is a chip with at least VDD pins, VSS pins, and ZENER pins U1, the internal circuit includes a comparator COMP1, a transistor PNP1 whose base is connected to the reverse terminal of the comparator COMP1, a current source composed of the second resistor R2 and the first PMOS transistor P1, and the first PMOS transistor P1 connected in parallel Two, three PMOS transistors P2, P3, and a current mirror composed of the first NMOS transistor N1 and the second NMOS transistor N2. The collector of the triode PNP1 is connected to the VSS pin, and the ZENER pin is connected to the first resistor R1 and the voltage regulator tube Z1.

[0021] The electrical signal VCC sent from the receiver is input from the VDD pin, ...

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Abstract

The invention discloses a satellite receiving control signal detection circuit, which includes a comparator, a triode whose base is connected to the reverse end of the comparator, the positive end is connected to the emitter of the triode, and the negative end is connected to the positive end of the comparator A first current source / resistor connected, a second current source / resistor whose positive terminal is connected to the inverting terminal of the comparator and whose negative terminal is connected to the collector of the triode. The invention makes the system circuit more concise and easy to maintain, greatly reduces the total number of devices and is suitable for mass production.

Description

technical field [0001] The invention relates to a satellite receiving control signal detection circuit. Background technique [0002] The high and low voltage control signal system in the existing satellite TV receiving system is used for the control between the satellite TV receiver and tuner or other equipment. Generally, it is composed of multiple discrete devices, which have a large number of components and low reliability. The so-called high and low voltage control signal refers to the control signal sent by the satellite TV receiver, which can be low voltage or high voltage. Low voltage refers to a voltage less than a fixed voltage VREF, and high voltage refers to a voltage greater than this fixed voltage VREF. A voltage, generally the fixed voltage VREF can be any voltage value between 14V and 15.5V, and the typical value is 14.75V. Generally speaking, the common value of low voltage is 13V or 14V, and the common value of high voltage is 18V. Different functions ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/165H04N5/44
Inventor 石万文江石根彭晓雷吴良松
Owner SUZHOU HUAXIN MICROELECTRONICS