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Browse Prior Art Database

Solid State Switch

IP.com Disclosure Number: IPCOM000094694D
Original Publication Date: 1965-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Whale, RL: AUTHOR

Abstract

The top drawing shows an analog switch. This connects input voltage V1 to load resistor RL with a minimum amount of offset voltage. The switch includes two transistors T1 and T2 which operate in the inverted mode. Control voltage VC, connected between the common base connection ad the common collector connection 5, opens and closes the switch.

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Solid State Switch

The top drawing shows an analog switch. This connects input voltage V1 to load resistor RL with a minimum amount of offset voltage. The switch includes two transistors T1 and T2 which operate in the inverted mode. Control voltage VC, connected between the common base connection ad the common collector connection 5, opens and closes the switch.

The two lower drawings show arrangements of this circuit, used as multiplexing switches. The middle drawing shows a switch which connects either one of two voltages V2 or V3 to a single load RL2. The switch includes three transistors T1A, T1B ad T2A. T1A and T1B are similar to transistor T1 in the upper drawing. T2A is similar to T2 in the upper drawing. The switch includes three control voltages VC1, VC2 and VC3. In order to connect any one of the input voltages to load resistor RL2, the associated control voltage VC1 or VC2 must be activated and likewise voltage VC3 must be activated. Thus, in order to connect one input to the load resistor, two control voltages must be activated. A large number of transistors similar to T1A ad T1B can be cascaded in order to handle a large number of inputs.

The bottom drawing shows a circuit for connecting one voltage VC4 to any one of a plurality of loads RL1 ad RL2. This circuit has three transistors T1X and T2R and T2S. T1X corresponds to T1 and T2R and T2S correspond to transistor T2 in the upper circuit. In order to connect the input V4 to any one of the loads, VC...