Circuit for automatically selecting signal with highest voltage from multi-channel voltage signals in low-cost and level compensation modes

• Main Authors: HUANG CONGCHAO, WANG LILONG
• Format: Patent
• Language: Chinese; English
• Published: 04.07.2012
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention discloses a circuit for automatically selecting a signal with the highest voltage from a plurality of channels of voltage signals in low-cost and level compensation modes. The circuit comprises at least one first input tube, at least one second input tube, a level shifting unit and a bias circuit, wherein at least one first input tube and at least one second input tube are connected into a source follower; a plurality of input signals are respectively connected with gates of the first input tube and the second input tube; sources of the first input tube and the second input tube are connected to the same output end node; the level shifting unit comprises a fifth N-channel metal oxide semiconductor (NMOS) transistor of which the gate is connected with a drain; the source of the fifth NMOS transistor is connected to the output end node, and the gate and the drain of the fifth NMOS transistor are connected to the output; the bias circuit comprises a current source, a sixth NMOS transistor, a sevent