Patent ID: 6980194
Filing Date: 2005-12-27
Classification: G09G,H03K

Abstract:
1. An amplitude conversion circuit converting a first signal having an amplitude corresponding to a first voltage into a second signal having an amplitude corresponding to a second voltage higher than said first voltage, comprising: first and second transistors of a first conductivity type having respective first electrodes both receiving said second voltage, respective second electrodes connected respectively to first and second output nodes for providing said second signal and a complementary signal of said second signal, and respective input electrodes connected respectively to said second and first output nodes; third and fourth transistors of a second conductivity type having respective first electrodes connected respectively to said first and second output nodes; and a drive circuit driven by said first signal and a complementary signal of said first signal, providing, in response to a leading edge of said complementary signal of said first signal, a third voltage higher than said first voltage between an input electrode and a second electrode of said third transistor to turn on said third transistor, and providing, in response to a leading edge of said first signal corresponding to a trailing edge of said complementary signal of said first signal, said third voltage between an input electrode and a second electrode of said fourth transistor to turn on said fourth transistor wherein said drive circuit includes a first capacitor having one electrode connected to the input electrode of said third transistor and the other electrode receiving the complementary signal of said first signal, a second capacitor having one electrode connected to the input electrode of said fourth transistor and the other electrode receiving said first signal, and a charge/discharge circuit for charging/discharging said first and second capacitors each to cause a voltage between one electrode and the other electrode of said first and second capacitors each to be equal to the threshold voltage of said third and fourth transistors.