| 摘要 |
The invention relates to current switches using a differential transistor pa ir and operating under a low supply voltage Vcc. According to the invention, th e current switch comprises two cascaded differential pairs of two transistors each (T1, T1b; T2, T2b), the second pair (T2, T2b) having complementary current outputs (H, Hb) that can be adjusted according to the state of the inputs (E, Eb). The first pair (T1, T1b) is connected to earth (GND) by a current source having a value lo and comprising a transistor (Ts1) which is polarised by a voltage Vbias, and is fed by a voltage equal to N.Vbe+Vbias, where N is a whole number (preferably equal to 1), and Vbe is the base-emitt er voltage of the transistor (Ts1). The second pair (T2, T2b) is connected to earth directly by a resistance (R2). The invention can be applied to the on/off control of sample-and-hold devices, multiplexers, low-voltage rapid logic circuits, etc.
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