Switch off isolation circuit diagram

Published:2011/9/14 23:48:00 Author:Sophia | Keyword: Switch off, Isolation | From:SeekIC

Conversion signal switches include mechanical switches, relays, analog switches. The frequency of the signal must be paid attention to when choosing these switches, not only the signal frequency through the switch need to be paid attention to when the switch is turned on, but also the signal via the switch leakage frequency need to be paid attention to when the switch is off, that is the isolation when switch is off. Figure is a the measurement circuit of the isolation when variety of small-signal switches are off. When frequency is 1MHZ, for mechanical switches and analog switches, the isolation is about 30dB, for the relay, it is about 25dB. Due to the impact of the switch construction and distributed capacitance within the switch, the isolation will become low. Therefore, the circuit construction can be considered to improved. high-frequency signal dedicated switch with enough isolation can be adopted.



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