A <inline-formula> <tex-math notation="LaTeX">$K$ </tex-math> </inline-formula>-Band SiGe Superregenerative Amplifier for FMCW Radar Active Reflector Applications

Integrated superregenerative amplifier based 24 GHz frequency modulated continuous wave radar active reflector tags for joint ranging and communication

“…Analysis in Section 2 showed that to maximise the operating range of the SRAs, the input sensitivity and output power has to be optimised simultaneously. Two SRA integrated circuits which achieve this goal using integrated quench pulse shaping based on [24] by the same authors ae shown in Figure 9.…”

“…It is seen from Equations ( 11) and (15), that in order to maximise the distance covered, it is required to increase not just the sensitivity of the SRA, but gain and output saturated power as well. So a novel quench pulse shaping was implemented in previous works of the same authors [24,25]. While ART buf uses SRA buf from Ref.…”

“…The sampling time window is described by a Gaussian sensitivity function illustrated in previously reported works such as Refs. [21,22,24]. The duration of the sensitivity window depends on the slope of the quench signal and the input signal frequency [24], yielding a higher sensitivity when there are more input signal cycles within the sensitivity window and vice versa.…”

“…[21,22,24]. The duration of the sensitivity window depends on the slope of the quench signal and the input signal frequency [24], yielding a higher sensitivity when there are more input signal cycles within the sensitivity window and vice versa. For example, with 10 cycles of 24 GHz signal the sampling window amounts to 416 ps; whereas, the quench pulse period for a 1 MHz quench signal corresponds to a duration of 1 μs.…”

“…This design features a cross-coupled oscillator based topology similar to our work in Ref. [24]. The second ART (ART buf ) illustrated on the right side of Figure 1a uses a buffered superregenerative amplifier (SRA buf ) IC from Ref.…”