Automatic control system
AssigneeHewlett-Packard Company
InventorsRonald K. Larson, John L. Imperato
Life of this patent
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Abstract
An automatic power control system compensates for temperature variable components in a broadband signal generator by providing a reference signal generating circuit that is temperature matched with an automatic level control feedback circuit. The temperature matched components are either monolithic or placed in substantial thermal contact with one another. The signals from the matched signal paths are input to a summing circuit such that the effect of any temperature variation in one path is exactly offset by the corresponding temperature variation in the other path.
Claims9
An automatic control system for controlling the output power level of a signal generator across a wide range of temperatures, comprising:
- dual monolithic logarithmic amplifier means connected for logarithmically amplifying reference level signals and the output signals of a signal generator, respectively;
- first and second detector means coupled to respective ones of the dual logarithmic amplifier means for detecting the power level of the signal generator and of the reference level signals, respectively, with the first and second detectors being of substantially identical design and construction and, further, being in thermal contact with one another;
- summing means connected to sum output signals from each of the dual monolithic logarithmic amplifier means;
- and
- modulating means responsive to output signals from the summing means for modulating the output of the signal generator to maintain constant output power.
An automatic control system for controlling the output power level of a signal generator across a wide range of temperatures, comprising:
- dual monolithic logarithmic amplifier means connected for logarithmically amplifying a reference level signal and the output signals of a signal generator, respectively;
- first and second detector means coupled to the inputs of respective ones of the dual logarithmic amplifier means for detecting the power levels of the signal generator and of the reference level signals, respectively, the first and second detectors being substantially identical and in thermal contact with one another;
- summing means connected to sum output signals from each of the dual monolithic logarithmic amplifier means;
- and
- modulating means responsive to output signals from the summing means for modulating the output of the signal generator to maintain constant output power.
Dependencies are inferred from the claim text.