Which of these is wrong for an all-pass filter?(a) It is used for phase equalization in a communication system(b) It is used in landline communication(c) Its phase shift is -2tan^-1RC, between 0 to -180°(d) It can be made using a single op-ampThe question was asked in class test.My question is based upon Frequency Filters topic in section Op-amps and its Applications of Analog Circuits

Which of these is wrong for an all-pass filter?(a) It is used for phas

1.	Which of these is wrong for an all-pass filter?(a) It is used for phase equalization in a communication system(b) It is used in landline communication(c) Its phase shift is -2tan^-1RC, between 0 to -180°(d) It can be made using a single op-ampThe question was asked in class test.My question is based upon Frequency Filters topic in section Op-amps and its Applications of Analog Circuits
Answer» The correct option is (c) Its phase shift is -2tan^-1RC, between 0 to -180° Explanation: An all-pass FILTER passes all frequencies but provides a different phase shift to each frequency PRESENT in the CIRCUIT. It is used for phase equalization or delay equalization and is used in landline communication. Following is a circuit of an all-pass filter USING a single op-amp. However, its phase shift is -2tan^-1(ωRC)

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