Phase shifter

A phase shifter receiving an input signal and producing four output signals having sequential 90.degree. phase differences from each other comprising:

• first and second input nodes for respectively receiving first and second input signals having opposite phases;
• third and fourth input nodes for respectively receiving third and fourth input signals respectively having the same phases as the second and first input signals applied to said second and first input nodes;
• a first serial connection of a first resistor and a second resistor, said first and second resistors having the same resistance values and being connected at a first resistor node, a first end of said first serial connection being connected to said first input node;
• a second serial connection of a first capacitor and a second capacitor, said first and second capacitors having the same capacitance values and being connected at a first capacitor node, said second serial connecting being connected between the a second end of said first serial connection and said third input node;
• a third serial connection of a third resistor and a fourth resistor, said third and fourth resistors having the same resistance values and being connected at a second resistor node, a first end of said third serial connection being connected to said second input node;
• a fourth serial connection of a third capacitor and a fourth capacitor, said third and fourth capacitors having the said capacitance values and being connected at a second capacitor node, said fourth serial connection being connected between the a second end of said third serial connection and said fourth input node;
• first, second, third, and fourth output nodes respectively connected to the first resistor node, the first capacitor node, the second resistor node, and the second capacitor node to produce output signals having sequential 90.degree. phase differences.