Temperature Compensated Internal LNA Noise Calibration Source
In this letter, a new temperature-compensated internal LNA noise calibration source for system temperature monitoring is presented. It is easily integrated into amplifiers and has a negligible impact on the noise performance. The power level of the proposed calibration source is temperature compensated by a negative temperature coefficient (NTC) thermistor varying the bias voltage of the noise diode. The measured variation of the compensated calibration level is only ±0.5 K for 34 K calibration level at 1.4 GHz in a temperature range from −40°C to +40 °C. This internal noise calibration source is controlled by the detection of a tone signal applied on the RF output cable thus requiring no additional wiring to the amplifier. The designed noise calibration source provides monitoring of system noise temperature without the additional noise and cost of a directional coupler between ambient-temperature LNA and antenna.
Additional Information© 2021 IEEE. Manuscript received February 11, 2021; revised April 10, 2021 and May 13, 2021; accepted May 23, 2021. Date of publication May 26, 2021; date of current version August 9, 2021. This work was supported by the U.S. National Science Foundation under Grant NSF 1836018.
Accepted Version - 09440921.pdf