System and method for a mixed voltage drive system for floating substrate technology

A method for generating a pad signal having low noise for driving a peripheral device comprising:

• receiving an output signal;
• generating a pull-up signal in response to the output signal being a logic high-signal level, generating the pull-up signal including the steps of generating a voltage maintenance signal for maintaining a voltage level of the pull-up signal and receiving an oscillator signal at an oscillator circuit for providing regular signals to a keeper circuit;
• generating a plurality of pull-down signals in response to the output signal being a logic low signal level;
• receiving the pull-up signal or the plurality of pull-down signals at an output driver;
• and
• staggering the plurality of pull-down signals in the output driver to generate the pad signal having low noise.

A mixed voltage drive system for generating a pad signal having a pull-up or a pull-down voltage level to drive a peripheral device, comprising:

• an output predriver having a pull-up subsystem and a pull-down subsystem, both the pull-up subsystem and the pull-down subsystem coupled to receive an output signal, the pull-up subsystem for generating a pull-up signal in response to the output signal being a logic high and the pull-down subsystem for generating a pull-down signal in response to the output signal being a logic low;
• and
• an output driver having a pull-up circuit and a pull-down circuit, the pull-up circuit coupled to receive the pull-up signal and the pull-down circuit coupled to receive the pull-down signal, the output driver for generating the pad signal that is pulled up in voltage level in response receiving the pull-up signal and for generating the pad signal that is pulled down in voltage level in response to receiving the pull-down signal;
• wherein the pull-down subsystem includes a stagger circuit and a switch circuit, the stagger circuit for receiving the output signal and generating the pull-down signal and the switch circuit for rapidly turning off the stagger circuit once the pull-down signal is generated.

A method for generating a pad signal having low noise for driving a peripheral device comprising:

• receiving an output signal;
• generating a pull-up signal in response to the output signal being a logic high-signal level;
• generating a plurality of pull-down signals in response to the output signal being a logic low signal level, wherein generating the plurality of pull-down signals includes staggering the received output signal at a staggering circuit to generate the at least one pull-down signal and switching off the staggering circuit upon generating the at least one pull-down signal;
• receiving the pull-up signal or the plurality of pull-down signals at an output driver;
• and
• staggering the plurality of pull-down signals in the output driver to generate the pad signal having low noise.