Integrated circuit with functions of bias and polarization selection

Abstract

The invention provides an integrated circuit with functions of bias and polarization selection, comprising a reference voltage and current circuit. According to the comparison result of a polarization selection signal input by peripheral signal receiving equipment and a reference voltage or a current signal provided by the reference voltage and the current circuit, a control circuit selects one of a horizontal polarization passage and a vertical polarization passage to stay in a working state; a first amplifier tube bias and protective circuit and a second amplifier tube bias and protective circuit are respectively connected with a peripheral first amplifier tube and a peripheral second amplifier tube to form the horizontal polarization passage and the vertical polarization passage; a third amplifier tube bias and protective circuit is connected with a peripheral third amplifier tube; a negative voltage generation circuit is connected with the reference voltage and current circuit to provide negative voltage for the first, second and third amplifier tube bias and protective circuits; and a drain current adjustment circuit is connected with the reference voltage and current circuit to regulate the drain current which is output to the three amplifier tubes. The integrated circuit has high stability, low cost and simple structure, is suitable for mass production, and can be applied to high-frequency heads of satellite televisions and the like.

Description

Technical field [0001] The present invention relates to an LNB (Low Noise Block, high-frequency head) in satellite television receiving equipment, and particularly relates to an integrated circuit with both bias and polarization selection functions that can be applied to LNB. Background technique [0002] With the rapid development of satellite TV, the types of LNBs are becoming more and more abundant, but each type of LNB needs a corresponding bias and polarization selection circuit. Traditional LNB circuits mostly use discrete devices, but the discrete device systems are cumbersome, poor stability, long production cycle, and high cost. Although there are also some LNBs that use integrated circuits, these circuit designs still cannot provide suitable pin functions for certain types of LNBs that require both bias and polarization options. Summary of the invention [0003] The purpose of the present invention is to provide an integrated circuit that can provide suitable functions ...

AI Technical Summary

Problems solved by technology

Traditional LNB circuits mostly use discrete devices, but the system using discrete devices is cumbersome, has poor stability, long production cycle, and high cost

Although there are some LNBs using integrated circuits, these circuit designs still cannot provide suitable pin functions for specific types of LNBs that require both bias and polarization options.

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