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Bidirectional Bipolar Electronic Switch

IP.com Disclosure Number: IPCOM000047515D
Original Publication Date: 1983-Nov-01
Included in the Prior Art Database: 2005-Feb-07

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Bhansali, MM Munoz-Bustamante, C Zalph, WN [+details]


Electronic switching of bidirectional signals is achieved in bipolar technology. Switching of a bidirectional signal from point A to point B is achieved in bipolar technology (Fig. 1A). This capability is identical to that of a field-effect transistor (FET) switch (Fig. 1B) but may not be accomplished identically in bipolar technology. A typical bipolar switch is unidirectional (Fig. 1C). The FET switch of Fig. 1B will switch a signal of any voltage from node A to node B or vice versa as will the switch of Fig. 1A. The typical bipolar open collector switch of Fig. 1C, however, will only switch a signal from node A to -V. This constraint places an artificial limit on circuits designed in bipolar technology. In the bidirectional bipolar switch of Fig. 2, transistor T1 or T2 forms the signal path.