| 摘要 |
1536004 Voltage multiplying circuit ROCKWELL INTERNATIONAL CORP 2 Dec 1976 [5 March 1976] 50350/76 Heading H2F An integrated circuit voltage doubler forming a power supply circuit for a transistor device Q 1 comprises an inverter of FETs Q 3 , Q 4 fed with clock signals # 1 , # 3+4 , a bootstrap inverter of FETs Q 7 , Q 8 , Q 9 , fed with clock signal # 1 , an inverter and switching circuit of FETs Q 13 , Q 14 , Q 15 also fed with clock signals # 1 and # 3 , and switching FETs Q 5 , Q 6 , Q 10 , Q 11 and Q 12 , the arrangement being such that during a first time interval the inverter of FETs Q 3 , Q 4 and switching FETs Q 5 , Q 6 , Q 12 and Q 13 switch so that storage capacitors C 2 and C 3 charge to a voltage equal to the supply operating voltage V DD fed to the power supply circuit, then during a second time interval the bootstrap inverter charges the junction 8 between the two storage capacitors C 2 and C 3 to a voltage equal to the supply operating voltage and as there is no discharge path then for the storage capacitors the voltage at the junctions 6 and 7 connected to the opposite sides of capacitors C 2 and C 3 from their common junction 8 becomes equal to twice the supply operating voltage. The switching FETs Q 10 , Q 11 are conducting during this second time interval and thus junction 13 and interface storage capacitor C 5 between the supply circuit and the driver for the transistor device are charged to approximately twice the supply operating voltage. To maintain this doubled voltage at the junction 13 the FETs Q 10 and Q 11 are cut off. The doubled voltage is fed via a switching FET Q 20 to the transistor device Q 1 . To compensate for the threshold drop voltage of switching FETs Q 10 , Q 11 , the switching FET Q 11 is turned on hard by the inverter and switching circuit of FETs Q 13 , Q 14 , Q 15 . To compensate for the threshold drop voltage of switching FET Q 20 it is switched on hard by its control circuit of FETs Q 16 , Q 17 , Q 18 and Q 19 . The transistor device Q 1 is said to be a digit select FET controlling light emitting diodes of a calculator display, or liquid crystal or fluorescent tube devices. |
