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Integrated Bipolar Transistor Analog Switch

IP.com Disclosure Number: IPCOM000049576D
Original Publication Date: 1982-Jun-01
Included in the Prior Art Database: 2005-Feb-09

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Bersac, JM Delaporte, F Verhaeghe, M [+details]


In many applications, it is desirable to have a switch capable of switching an analog signal varying over a symmetrical wide current range. Unfortunately, the well-known integrated single bipolar transistor switch does not have the above capability owing to the presence of a parasitic substrate transistor, unless a large current flow in the substrate is acceptable. The figure illustrates a two bipolar transistor switch which has the desired capability.