Low voltage operation bias current generation circuit

A method of generating a bias current comprising:

• supplying a voltage difference to a bias current generation circuit, wherein the bias current generation circuit is configured to operate as long as the voltage difference equals at least a threshold voltage plus two overdrive voltages of a transistor in the bias generation circuit;
• and
• generating a bias current with the bias current generation circuit, wherein the bias current is capable of remaining approximately constant despite variations in the voltage difference.

A device comprising:

• a bias current generation circuit configured to generate a bias current when a voltage difference across the bias current generation circuit is equal to or greater than an overdrive voltage plus a threshold voltage of a transistor of the bias current generation circuit, wherein the bias current generation circuit is configured to generate a bias current capable of remaining approximately constant despite changes in the voltage difference across the bias current generation circuit.

A system comprising:

• a processor;
• and
• a memory device operably coupled to the processor, the memory device comprising a bias current generation circuit configured to generate a bias current when a voltage difference across the bias current generation circuit is equal to or greater than an overdrive voltage plus a threshold voltage of a transistor of the bias current generation circuit, wherein the bias current generation circuit is configured to generate a bias current capable of remaining approximately constant despite changes in the voltage difference across the bias current generation circuit.