Voltage threshold sensing systems and related methods
AssigneeSemiconductor Components Industries, LLC
InventorsCatalin Ionut Petroianu, Alexandra-Oana Petroianu, Pavel Londak
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Abstract
Implementations of voltage sensing systems may include: a high side current mirror coupled to a reference current source coupled to at least one diode. The at least one diode may be coupled to a resistor and to a comparator. The resistor may be coupled to the ground. The comparator may be coupled with a reference voltage. The comparator may be configured to receive a comparison voltage from the diode and output whether the comparison voltage is higher or lower than the reference voltage.
Claims10
A voltage sensing system comprising:
- a first high side current mirror comprising a first transistor and a second transistor, the first high side current mirror coupled to a first reference current;
- a second high side current mirror comprising a third transistor and a fourth transistor, the second high side current mirror coupled to a second reference current;
- a fifth transistor coupled between the second high side current mirror and the comparator;
- at least one diode coupled between the first high side current mirror and the second high side current mirror, the at least one diode coupled to a comparator;
- wherein the first high side current, the second high side current, and the at least one diode are coupled to ground;
- wherein a current passed by the second transistor is greater than a current passed by the fourth transistor;
- and
- wherein the comparator is coupled with a reference voltage and configured to receive a comparison voltage from the at least one diode and output whether the comparison voltage is one of higher and lower than the reference voltage.
A voltage threshold sensing system comprising:
- two p-channel metal-oxide-semiconductor field-effect (PMOS) transistors coupled together, the gates of the two PMOS transistors coupled to the drain of a first one of the two PMOS transistors, the drain of the first one of the two PMOS transistors coupled with a constant current source, and a drain of a second one of the two PMOS transistors coupled to a diode;
- wherein the diode is coupled with a high impedance input of a comparator and to a resistor coupled to ground;
- and
- wherein the comparator is configured to determine whether a supply voltage coupled to the second one of the two PMOS transistors is one of above and below a reference voltage coupled to another high impedance input of the comparator.
Dependencies are inferred from the claim text.