Superregeneration Revisited: From Principles to Current Applications

Pala-Schonwalder, P.; Bonet-Dalmau, Jordi; Aguila-Lopez, Francisco del; Moncunill-Geniz, F. Xavier; Giralt-Mas, R.

doi:10.1109/mmm.2019.2952018

Cited by 3 publications

(6 citation statements)

References 62 publications

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“…The process of turning the oscillator on and off is called quenching [21]. When an input signal is present at the resonator core within a small time window around the critical sampling instant T samp when the oscillator starts up, the signal undergoes phase coherent amplification in the time interval between T samp and T q,on [21, 22]. A single such quench signal period and the corresponding signal output is illustrated in Figure 5.…”

Section: Sra and Fmcw Radar Based Rangingmentioning

confidence: 99%

“…Also, since they interface to sensors, they can be used in a wide range of moderate range wireless sensor node applications such as toll collection and inventory management [2, 3]. The ARTs are based on high gain integrated superregenerative amplifiers (SRAs) utilising the superregeneration principle [21, 22]. The distance to the ART is determined using the difference between two beat frequencies centred around a known quench frequency based on the SILO approach introduced in Ref.…”

Section: Introductionmentioning

confidence: 99%

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

Thayyil

Figueroa

Joram

et al. 2023

IET Radar Sonar & Navi

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Concepts for two cooperative active reflector tags (ARTs) for joint ranging and communication in a linear frequency modulated continuous wave secondary radar system are presented along with corresponding theoretical derivations. To prove the concepts, the ARTs operating from 24 to 24.5 GHz are implemented using custom integrated superregenerative amplifiers (SRAs) designed in a 130 nm SiGe BiCMOS technology. The SRAs have a measured minimum detected input power greater than −80 dBm, and an output power greater than 3.2 dBm after wire‐bonding. The ARTs also feature roll invariance using bandwidth enhanced microstrip patch antenna diversity and a novel quench frequency shift keying based low data rate simplex communication. Indoor ranging experiments done to prove the concepts and the theoretical considerations show a maximum distance of 77 m in the ranging mode and a data rate of 0.5 symbols per second in the data transfer mode. For distances less than 5 m, the characterised accuracy is better than 12 cm and the precision is better than 2 cm. To the best of authors' knowledge this is one of the first reported scientific works leading to a proof of concept for integrated superregenerative amplifier based joint ranging and quench frequency shift keying. The combination of maximum range and precision are also one of the best reported among similar works in the literature.

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Section: Sra and Fmcw Radar Based Rangingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Thayyil

Figueroa

Joram

et al. 2023

IET Radar Sonar & Navi

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“…It has been verified that the slope of the conductance 𝐺 (or the damping factor ζ ) of the resonance tank in SRO at the zero crossing determines SRR's frequency response. When a slope waveform is employed as the quenching signal in the transition phase, SRR's frequency response can be described with [3]:…”

Section: B the Averaged Fraction Division Schemementioning

confidence: 99%

“…An SRR usually consists of a superregenerative oscillator (SRO), a quenching waveform generator (QWG), and an envelope detector (ED) and possesses some significant advantages. It has been shown that SRR with an optimized quenching is capable of a narrowband-passing, leading to excellent receiving selectivity and sensitivity [1], [2], [3]. Furthermore, SRR needs only a few components operating at high frequencies to achieve a high gain and therefore consumes less power.…”

Section: Introductionmentioning

confidence: 99%

“…One of them is the deterioration caused by the frequency deviation between SRO's resonant frequency and the received carrier frequency. Conversely, SRR can get the best performance only if its resonant frequency equals the received carrier frequency [1], [2], [3]. Unfortunately, this is hard to achieve in practice due to process, voltage, and temperature (PVT) variations of the components in SRO.…”

Section: Introductionmentioning

confidence: 99%

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A Fast Background Frequency Calibration Based on Intermittent Frequency Locked Loop for the Super-Regenerative Receive

et al. 2022

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The conventional phase-locked loops or frequency-locked loops should take time to calibrate the oscillator's resonant frequency in a super-regenerative receiver (SRR) and severely disrupts the receiver's operations. This paper proposes a novel intermittent frequency locked loop (IFLL) as a frequency synthesizer to continuously maintain the resonant frequency equal to the preset target frequency without interruption to the SRR. An analog loop mainly composed of a time-register-based frequency detector and a charge pump is proposed to achieve precise frequency detection during each SRR's quenching period regardless of the inevitable initial phase error, and adjust SRR's resonant frequency accordingly. An average fractional division scheme is adopted to improve IFLL's frequency resolution to the level of the quenching frequency. The operations of the IFLL are analyzed with the z-domain transfer function, including the stability and frequency response. A prototype is built and tested. The measurement results show that the proposed IFLL only needs a calibration cycle of fewer than 50 μs to adjust SRR's resonant frequency without interruption against its receiving. The real-time frequency error after calibration is smaller than 70 kHz. SRR opposes a sensitivity of -61.2 dBm @ 200 kbps and a 3-dB bandwidth of 2.2 MHz.INDEX TERMS Average fractional division scheme, background frequency calibration, frequency-locked loop, initial phase error, phase-locked loop, super-regenerative receiver, time register.

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A Subharmonic Super-Regenerative FMCW Radar With Improved Intermodulation Efficiency for Applications Beyond Cut-Off Frequency

Hahn,

Vossiek,

Carlowitz

2024

IEEE Trans. Microwave Theory Techn.

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Superregeneration Revisited: From Principles to Current Applications

Cited by 3 publications

References 62 publications

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

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

A Fast Background Frequency Calibration Based on Intermittent Frequency Locked Loop for the Super-Regenerative Receive

A Subharmonic Super-Regenerative FMCW Radar With Improved Intermodulation Efficiency for Applications Beyond Cut-Off Frequency

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