HIGH FREQUENCY SIGNAL SWITCHING DEVICE

摘要

PURPOSE:To prevent mixing of noise to the output of a differential amplifier by shielding electrostatically a conductor connecting two impedance elements and a changeover switch, and connecting the midpoint of the changeover switch and the grounding point of the differential amplifier. CONSTITUTION:The conductors 12, 13 connecting a signal polarity changeover switch 11 and impedance elements 5, 6 are shielded electrostatically. The midpoint 14 of the signal polarity changeover switch 11 and the grounding point 15 of the differential amplifier 4 are connected. Through the constitution above, the conductor wiring to the signal polarity changeover switch is enclosed between differential amplifier ground potentials to eliminate the electromagnetic coupling with a high frequency signal source.