| Title |
Design of 6 GHz Adaptive Low Noise Amplifier usign Adaptvie Bias Circuit for Radar Receiver |
| Authors |
남형석(Hyungseok Nam) ; 우규식(Kyusik Woo) ; 서철헌(Chulhun Seo) |
| DOI |
https://doi.org/10.5573/ieie.2022.59.12.22 |
| Keywords |
Adaptive-bias circuit; Adaptive-gain low noise Amplifier; IP1dB; Linearity |
| Abstract |
This paper proposes a 6 GHz single BJT adaptive-gain low noise amplifier (AGLNA) using an adaptive-bias circuit (ABC) for radar receiver. The ABC consists of an RF-DC rectifier and a JFET-based voltage-controlled resistor. The designed AGLNA can be used in short/long-distance radar detection with characteristics of lower gain in the strong echo of short-distance objects to prevent receiver saturation, and high gain in the low-echo of long-range objects for achieving high signal-to-noise ratio. For verification, a AGLNA using a realistic BJT is simulated showing that the ABC can provide biasing base voltage from 873 mV to 838 mV with an increase of the RF input power without an external signal. As a result, the AGLNA has an initial high gain of 16.5 dB, noise figure of 1.3 dB while the input 1dB gain compression (IP1dB) point is improved by more than 2 dB. |