Intercept-temperature drift calibration of a signal strength detector
AssigneeAnalog Devices, Inc.
InventorsPetrus M. Stroet, Daniel J. Linebarger, John P. Myers, Michael Hendrikus Laurentius Kouwenhoven
Life of this patent
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Abstract
A device may include an intercept-temperature drift input to receive an intercept-temperature drift value. The device may further include a reference current generator that generates a reference current based at least in part on the intercept-temperature drift value. Additionally, the device may include an analog signal chain that adjusts a slope-temperature drift of the signal-strength detector by adjusting a delta proportional to absolute temperature of the analog signal chain.
Claims19
A signal-strength detector comprising:
- an intercept-temperature drift input to receive an intercept-temperature drift value;
- a reference current generator that generates a reference current based at least in part on the intercept-temperature drift value, wherein the reference current generator generates the reference current as a weighted sum of a proportional to absolute temperature (PTAT) current and a complementary to absolute temperature (CTAT) current;
- and
- an analog signal chain that adjusts an intercept-temperature drift of the signal-strength detector based at least in part on the reference current.
A photocurrent detection system comprising:
- a photocurrent detector configured to receive a photocurrent output by a photodiode;
- and
- a signal-strength detector configured to measure a signal strength of the photocurrent output, wherein the signal-strength detector comprises:
- an intercept-temperature drift input to receive an intercept-temperature drift value;
- a reference current generator that generates a reference current based at least in part on the intercept-temperature drift value;
- and
- an analog signal chain that adjusts an intercept-temperature drift of the signal-strength detector based at least in part on the reference current.
A method of calibrating a signal-strength detector, the method comprising:
- causing a resistive heater of the signal-strength detector to be in an OFF state;
- for an input current value corresponding to a photocurrent of a photodetector and when the resistive heater is in the OFF state,
- sweeping a slope-temperature drift of an output value of the signal-strength detector generated based on the input current value among a range of slope-temperature drift values;
- and
- for each slope-temperature drift value of the range of slope-temperature drift values, sweeping a reference current value among a range of reference current values to obtain a first set of intercept values;
- causing the resistive heater to be in an ON state, wherein the resistive heater heats at least an analog signal chain of the signal-strength detector when in the ON state;
- for the input current value corresponding to the photocurrent of the photodetector and when the resistive heater is in the ON state,
- sweeping the slope-temperature drift of the output value of the signal-strength detector generated based on the input current value among the range of slope-temperature drift values;
- and
- for each slope-temperature drift value of the range of slope-temperature drift values, sweeping the reference current value among the range of reference current values to obtain a second set of intercept values;
- using the first set of intercept values and the second set of intercept values, performing linear regression to determine an intercept-temperature drift control value that minimizes intercept-temperature drift of the signal-strength detector;
- and
- configuring a register value of the signal-strength detector with the intercept-temperature drift control value, wherein the signal-strength detector sets the reference current value based at least in part on the intercept-temperature drift control value during operation.
Dependencies are inferred from the claim text.