Systems, methods, and devices for multi-reference voltage generators
Systems, methods, and devices generate multiple reference voltages. Methods include receiving, at a voltage regulator, a voltage from a voltage source, and generating, using the voltage regulator, a tracking current based on the received voltage, the tracking current having an amplitude that tracks changes in a voltage level of the voltage source. Methods also include generating, using the voltage regulator, a first reference voltage based on the tracking current, the first reference voltage being a designated voltage less than the voltage source and tracking changes in the voltage level of the voltage source, and generating, using the voltage regulator, a second reference voltage based on the received voltage, the second reference voltage being a fixed voltage.
1. A method comprising:
receiving, at a voltage regulator, a voltage from a voltage source;
generating, using the voltage regulator, a tracking current based on the received voltage, the tracking current having an amplitude that tracks changes in a voltage level of the voltage source;
generating, using the voltage regulator, a first reference voltage based on the tracking current, the first reference voltage being a designated voltage less than the voltage source and tracking changes in the voltage level of the voltage source; and
generating, using the voltage regulator, a second reference voltage based on the received voltage, the second reference voltage being a fixed voltage.
2. The method of claim 1 , wherein the generating of the tracking current further comprises:
providing the voltage and an output of an energy source to a differential amplifier; and
providing an output of the differential amplifier to a first transistor.
3. The method of claim 2 , wherein the energy source is a current source.
4. The method of claim 2 , wherein the energy source is a voltage source.
5. The method of claim 2 , wherein the first reference voltage is measured at a drain of the first transistor.
6. The method of claim 1 , wherein the generating of the second reference voltage further comprises:
providing the voltage to a second transistor, the second transistor having a source coupled to a circuit ground.
7. The method of claim 6 , wherein the second reference voltage is measured at a drain of the second transistor.
8. The method of claim 7 , wherein the second transistor is an N-type metal-oxide-semiconductor field-effect transistor.
9. The method of claim 1 , wherein the voltage source is a battery.
10. A system comprising:
a power supply; and
a voltage regulator configured to:
receive a voltage from a voltage source;
generate a tracking current based on the received voltage, the tracking current having an amplitude that tracks changes in a voltage level of the voltage source;
generate a first reference voltage based on the tracking current, the first reference voltage being a designated voltage less than the voltage source and tracking changes in the voltage level of the voltage source; and
generate a second reference voltage based on the received voltage, the second reference voltage being a fixed voltage.
11. The system of claim 10 , wherein the voltage regulator is further configured to:
provide the voltage and an output of an energy source to a differential amplifier; and
provide an output of the differential amplifier to a first transistor.
12. The system of claim 11 , wherein the energy source is a current source.
13. The system of claim 11 , wherein the energy source is a voltage source.
14. The system of claim 11 , wherein the first reference voltage is measured at a drain of the first transistor.
15. The system of claim 10 , wherein the voltage regulator is further configured to:
provide the voltage to a second transistor, the second transistor having a source coupled to a circuit ground, wherein the second reference voltage is measured at a drain of the second transistor.
16. A device comprising:
a voltage generator configured to receive a voltage from a voltage source;
a variable gate voltage generator configured to generate a tracking current based on the received voltage, the tracking current having an amplitude that tracks changes in a voltage level of the voltage source;
a first reference voltage generator configured to generate a first reference voltage based on the tracking current, the first reference voltage being a designated voltage less than the voltage source and tracking changes in the voltage level of the voltage source; and
a second reference voltage generator configured to generate a second reference voltage based on the received voltage, the second reference voltage being a fixed voltage.
17. The device of claim 16 , wherein the variable gate voltage generator is further configured to:
provide the voltage and an output of an energy source to a differential amplifier; and
provide an output of the differential amplifier to a first transistor.
18. The device of claim 17 , wherein the energy source is a current source.
19. The device of claim 17 , wherein the energy source is a voltage source.
20. The device of claim 16 , wherein the second reference voltage generator is further configured to:
provide the voltage to a second transistor, the second transistor having a source coupled to a circuit ground, wherein the second reference voltage is measured at a drain of the second transistor.