| 摘要 |
In one embodiment of the invention, a programmable level shifter can be selectively configured to operate in either a high-speed mode or a low-power mode. In both modes, the level shifter converts an input signal in one power supply domain into an output signal in another power supply domain. In the high-speed mode, p-type devices are configured as a current-mirror amplifier that provides the level shifter with relatively fast switching speed. In the low-power mode, the same p-type devices are configured as a cross-coupled latch that provides the level shifter with relatively low power consumption. Selectively enabled n-type devices provide the low-power mode with larger effective n-type devices to flip the cross-coupled latch formed by the p-type devices in the low-power mode.
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