Switching circuit for switching constant current source...

Details Switching circuit for switching constant current source... Switching circuit for switching constant current source...

2006-08-01

2006-08-01

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Utilizing three or more electrode solid-state device

C326S064000, C326S084000

Reexamination Certificate

active

07084694

ABSTRACT:
A basic switching circuit combines CMOS and bipolar technique on SiGe basis and operates at a low operating voltage of only slightly more than 2V. To achieve this low operating voltage, switching operation of the circuit is effected by switching a constant current source of the switching circuit on or off using MOS transistors. In addition, the constant current source is implemented using a MOS transistor rather than a bipolar transistor, which basically acts as a controllable resistor. Moreover, the logic levels in the output signal are accurately controlled using a constant current source that is controlled by an operational amplifier and a resistor voltage divider at the output to pull the voltage level down by an amount that corresponds to the logical levels.

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