| 摘要 |
<p>PURPOSE:To simplify the constitution of a circuit to generate a 1/2VPP voltage by setting a first and a second capacitors and the gate capacity of a MOS transistor suitably. CONSTITUTION:The first and the second capacitor 9, 10 are connected in series between the output of a charge pump 1 circuit and the ground, and the MOS transistor 11 whose drain is connected to the output of the charge pump 1 circuit and its gate is connected to the contacting point between the capacitors 9, 10 in provided. By suitably setting the capacitance of the capacitors 9, 10 and the gate capacitance of the transistor 11, a specific intermediate voltage can be outputted from the source of the transistor. As a result, the 1/2VPP voltage necessary to realize a one-transistor type EEPROM can be generated by adding a simple constitution of circuit.</p> |
