Base resistance cancellation method and related methods, systems, and devices
Methods, systems and devices of the present disclosure involve techniques for cancelling base resistance error otherwise present in remote temperature sensors such as remote diode temperature sensors. In one or more embodiments, measurement logic configured to determine a temperature of or near a remote temperature sensor may be configured to determine an error cancelling coefficient and to calculate a temperature value, at least in part, responsive to the error cancelling coefficient. In some cases, error cancelling coefficients may be determined using one or more calibration techniques.
1. An apparatus for sensing a temperature of a remote diode temperature sensor, comprising:
a measurement circuit to:
receive first values indicative of voltage levels exhibited across a diode located remote from the measurement circuit;
determine at least two second values respectively indicative of a respective one of at least two voltage changes across the diode exhibited by the first values; and
determine a third value indicative of a temperature at the diode, wherein the third value is determined at least partially responsive to the at least two second values, fourth values that represent current levels of currents for biasing the diode, and a fifth value representing a resistance of respective paths utilized to sense the voltage levels exhibited across the diode.
2. The apparatus of claim 1 , wherein the currents for biasing the diode comprise pairs of biasing currents.
3. The apparatus of claim 1 , wherein each current for biasing the diode is proportional to each of the other currents for biasing the diode.
4. The apparatus of claim 3 , wherein each current for biasing the diode is different than each other current for biasing the diode.
5. The apparatus of claim 1 , wherein each current for biasing the diode is a multiple of a specified current.
6. The apparatus of claim 5 , wherein the multiple is of a range of about 1x to 20x, inclusive.
7. The apparatus of claim 1 , further comprising:
a biasing circuit to provide the currents for biasing the diode to at least one sensing path of the respective paths utilized to sense the voltage levels exhibited across the diode.
8. The apparatus of claim 7 , wherein the measurement circuit is to:
determine a route resistance associated with the at least one sensing path of the respective paths responsive to the at least two second values; and
determine a base resistance responsive to the least two second values.
9. The apparatus of claim 7 , further comprising:
a sensing circuit to measure voltage levels exhibited by a voltage across the respective paths while the currents for biasing the diode are being provided to the at least one sensing path.
10. The apparatus of claim 9 , wherein the biasing circuit is to provide a first current for biasing the diode that is a multiple of a specified current, and the sensing circuit is configured to measure a first voltage level of the voltage across the respective paths while the first current for biasing the diode is being provided.
11. The apparatus of claim 10 , wherein the biasing circuit is to provide a second current for biasing the diode that is a second multiple of the specified current, and the sensing circuit is to measure a second voltage level of a voltage across the respective paths while the second current for biasing the diode is being provided.
12. An apparatus having machine-readable instructions that, when executed by a processor comprising at least one processing core, enable the processor to:
receive first values indicative of voltage levels exhibited across a diode located remote from a measurement circuit;
determine at least two second values respectively indicative of a respective one of at least two voltage changes across the diode exhibited by the first values; and
determine a third value indicative of a temperature at the diode, wherein the third value is determined at least partially responsive to the at least two second values, fourth values that represent current levels of currents for biasing the diode, and a fifth value representing a resistance of respective paths utilized to sense the voltage levels exhibited across the diode.