A Concurrent Dual-Band and Dual-Mode Frequency Synthesizer for Radar Systems.

A simultaneous dual-band dual-waveform frequency synthesizer suitable for radar applications is presented. By using a K-band integer-N phase-locked loop (PLL) in conjunction with a W-band frequency modulation loop, a K-band sinusoidal carrier and W-band frequency-modulated continuous-wave frequency chirp can be generated concurrently. Due to the single PLL architecture for dual-band signal generation, additional loop filter, phase frequency detector, and dividers are no longer required for reduced chip area and power consumption. Fabricated in a 90-nm CMOS process, the proposed circuit occupies an area of 1.26 mm $\times1.675$ mm and consumes a dc power of 67 mW from a supply voltage of 1.2 V. [ABSTRACT FROM AUTHOR]