PIN diode switch circuit

Published:2011/6/19 10:48:00 Author:John | Keyword: diode, switch | From:SeekIC

In the circuit shown in Figure (a), the diode Dy and the signal line are used in series. When the diode conducts, the signal path is with low resistance. When the diode closes, it presents a high resistance (so as to achieve the switching function). When the switch S opens, the diode is not biased. The circuit has been disconnected because of the diode’s impedance. When S closes, the diode is forward biased and the resistance of signal channel is very low. The impedance ratio by the state of opening and closing is a measure of isolation for the circuit.



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