Patent ID: 7196547
Filing Date: 2007-03-27
Classification: H03K

Abstract:
1. A level shifter comprising: a voltage converting circuit configured to convert an input signal provided by a first power supply into an output signal provided by a second power supply; and a reset circuit configured to output a reset signal to said voltage converting circuit when said first power supply is turned off, wherein said voltage converting circuit has: a cross-coupled circuit including a first FET and a second FET which are cross-coupled and whose sources are connected to said second power supply; a first trigger FET connected to a gate of said second FET and configured to trigger said second FET in response to said input signal; a second trigger FET connected to said gate of said second FET in parallel with said first trigger FET; a third trigger FET connected to a gate of said first FET and configured to trigger said first FET in response to an inversion signal of said input signal; and a fourth trigger FET connected to said gate of said first FET in parallel with said third trigger FET, wherein any of said second trigger FET and said fourth trigger FET triggers corresponding one of said second FET and said first FET in response to said reset signal.