Resources Contact Us Home
Inverting logic buffer BICMOS switching circuit using an enabling switch for three-state operation with reduced dissipation

Image Number 3 for United States Patent #4678943.

A switching circuit comprises a pre-stage circuit coupled to receive an input signal and an output stage, wherein an output signal having a phase opposite to that of a signal of an input terminal IN can be obtained from an output terminal OUT of the output stage. The pre-stage circuit includes a p-channel MOSFET M1 and an n-channel MOSFET M2 that receive input signals at their gates. The output stage includes two NPN transistors Q1 and Q2 that are connected in series. The drain output of the p-channel MOSFET M1 is applied to the base of one of the transistors of the output stage, and the source output of the n-channel MOSFET M2 is applied to the base of the other of the transistors of the output stage. A third MOSFET M3 is coupled between a power supply and the p-channel MOSFET M1 and the n-channel MOSFET M2. When the MOSFET M3 is rendered non-conductive by a control signal EN, both MOSFETs M1 and M2 and both NPN transistors Q1 and Q2 become non-conductive irrespective of the signal of the input terminal IN. Under this condition, the output terminal OUT is in a floating state. Thus, the switching circuit is a tri-state circuit.

  Recently Added Patents
Systems and methods for implementing multi-application tabs and tab sets
Sonic fast-sync system and method for bluetooth
Communication system
Catalyst compositions for hydroformylation reaction and hydroformylation process using the same
Server-side web analytics system and method
3D IC method and device
Liquid composite compositions using non-volatile liquids and nanoparticles and uses thereof
  Randomly Featured Patents
On-chip supply regulators
Optical recording medium
Exhaust blockage system for engine shut down
Memory hub and method for memory system performance monitoring
Technique for providing network access to different entities
Exercise machine and methods
Anti-biofilm forming structure and method of manufacturing the same
Balloon catheter with distal guide wire lumen
Desk legs
Spin-transfer torque memory non-destructive self-reference read method