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US 10,296,025 B2Granted
Apparatus for electric current measurement or calibration and associated methods
AssigneeSilicon Laboratories Inc.
InventorKenneth W. Fernald
Life of this patent
Estimating the term…
Abstract
An apparatus includes an integrated circuit (IC). The IC includes a current source, to sink or source an output current, in response to a control signal, and a switch-capacitor resistor coupled to the current source. The apparatus further includes a controller coupled to derive the control signal from a voltage across the switch-capacitor resistor, the controller further to provide a switch control signal to the switch-capacitor resistor.
Claims20
An apparatus, comprising:
- an integrated circuit (IC), comprising:
- a current source, to sink or source an output current, in response to a control signal;
- and
- a switch-capacitor resistor coupled to the current source;
- and
- a controller coupled to derive the control signal from a voltage across the switch-capacitor resistor, the controller further to provide a switch control signal to the switch-capacitor resistor, wherein the controller uses the voltage across the switch-capacitor resistor to change a frequency of the switch control signal from a first frequency value to a second frequency value.
3 more elements
An apparatus, comprising:
- a microcontroller unit (MCU), comprising:
- a current source, to sink or source an output current, in response to a control signal;
- a switch-capacitor resistor coupled to the current source;
- and
- a signal processing circuit coupled to receive a voltage across the switch-capacitor resistor and to provide an output signal, the signal processing circuit having an offset voltage;
- and
- a controller coupled to derive the control signal from the output signal of the signal processing circuit and the offset voltage, the controller further to provide a switch control signal to the switch-capacitor resistor, wherein the controller uses the offset voltage to set a frequency of the switch control signal.
4 more elements
A method comprising:
- sinking or sourcing an output current from a current source in response to a control signal;
- providing the output current to a switch-capacitor resistor;
- deriving the control signal from a voltage across the switch-capacitor resistor;
- and
- providing a switch control signal to the switch-capacitor resistor, wherein an offset voltage is used to set a frequency of the switch control signal.
2 more elements
Dependencies are inferred from the claim text.