| 摘要 |
PROBLEM TO BE SOLVED: To achieve a challenge of introducing two real numbers zero being symmetric about a jωaxis with a simple mechanism in which a voltage amplifier having a difficulty in forming a wide band is not used without influencing pole arrangement of a filter circuit, in an equivalent phase filter circuit, having an amplitude boost function, originated from an iso-ripple phase filter circuit. SOLUTION: In the equivalent phase filter circuit having an amplitude boost function and originated from an iso-ripple phase filter circuit, a structure is employed in which a current ki proportional to the sumαi of signal currents for driving an integrater capacitance C1 connected to an output of a former stage circuit 11 is supplied to an integrater capacitance C2 connected to an output of a bi-quad circuit 12, thereby allowing the circuit to have an amplitude boost function with only a Gm-C integrater which is the same as the other filter constituents. COPYRIGHT: (C)2003,JPO
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