GROUP DELAY ADJUSTMENT CIRCUIT, GROUP DELAY ADJUSTMENT SYSTEM, AND GROUP DELAY ADJUSTMENT METHOD

摘要

A group delay adjustment circuit, a group delay adjustment system, and a group delay adjustment method capable of inclining the group delay difference without deteriorating the frequency band of an amplifying section and controlling the group delay difference to a constant level through external control. The group delay adjustment circuit (41) is characterized by comprising a first capacitor (21) connected with an input terminal (IN), a second capacitor (22) connected between the first capacitor (21) and an output terminal (OUT), and an impedance varying section (23) connected between the connection node of the first and second capacitors (21, 22) and the GND, having an adjustment terminal (24) and a monitor terminal (25), and capable of outputting a monitor signal corresponding to the group delay difference from the monitor terminal (25) by varying the impedance depending on a signal fed to the adjustment terminal (24) and thereby adjusting the group delay difference of the signal transmitted from the input terminal (IN) to the output terminal (OUT).