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Four-phase shift keying circuit

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专利汇可以提供Four-phase shift keying circuit专利检索,专利查询,专利分析的服务。并且PURPOSE: To easily attain rectangular adjustment and to shorten the manhour of adjustment by automatically controlling the rectangular phases of 4-phase shift keying output signal.
CONSTITUTION: When a phase difference is π/2+θ at the time of inputting two signals to a multiplier 5 and passing the multiplied signal through a low pass filter (LPF) 4, the output of the LPF 4 becomes-sinθ, and in the case of π/2-θ, the output becomes sinθ. In the case of a rectangular state having no error angle θ, the output becomes zero. Thereby, the deviation θ of the phase difference between the outputs of two system modulators from π/2 can be allowed to correspond to a DC component. When a DC component from a sampling circuit 3 is inputted to a controller 11 and converted into its corresponding voltage and a voltage control phase shifter 1 is controlled by the converted voltage, the modulator outputs of the two systems can be orthogonally crossed.
COPYRIGHT: (C)1992,JPO&Japio,下面是Four-phase shift keying circuit专利的具体信息内容。

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