Systems and Methods Of Providing Programmable Voltage And Current Reference Devices

A method of programming a voltage reference device, comprising:

• inserting charge into a first floating-gate transistor including a first source, a first drain, and a first gate, wherein the first gate is coupled to a first programming capacitor and a first input capacitor;
• inserting charge into a second floating-gate transistor including a second source, a second drain, and a second gate, wherein the second gate is coupled to a second programming capacitor and a second input capacitor;
• and
• measuring a reference voltage by determining a charge difference between the first floating-gate transistor and the second floating-gate transistor.

A circuit comprising:

• a first transistor comprising a first source, a first drain, and a first gate;
• a second transistor comprising a second source, a second drain, and a second gate;
• a third transistor comprising a third source, a third drain, and a third gate;
• a fourth transistor comprising a fourth source, a fourth drain, and a fourth gate;
• a first resistor coupled between the first source of the first transistor and a voltage source;
• a first capacitor coupled between a tunneling voltage and the first gate of the first transistor;
• a second capacitor coupled between the first gate of the first transistor and a first node;
• a third capacitor coupled between the first node and the second gate of the second transistor;
• a fourth capacitor coupled between the second gate of the second transistor and the tunneling voltage;
• the voltage source coupled to the second source of the second transistor;
• the second drain of the second transistor coupled to the first node and the fourth drain of the fourth transistor;
• the third source of the third transistor coupled to a ground source;
• the third gate of the third transistor coupled to fourth gate of the fourth transistor, the first drain of the first transistor, and the third drain of the third transistor;
• and
• the fourth source of the fourth transistor coupled to the ground source.

A reference device comprising:

• a first floating-gate transistor including a first source, a first drain, and a first gate, wherein the first gate is coupled to a first programming capacitor and a first input capacitor;
• a second floating-gate transistor including a second source, a second drain, and a second gate, wherein the second gate is coupled to a second programming capacitor and a second input capacitor;
• and
• wherein a charge difference between the first floating-gate transistor and the second floating-gate transistor is a reference voltage;
• and
• wherein a current reference can be determined by loading a first resistor with the reference voltage.