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The conventional phase-locked loops or frequency-locked loops should take time to calibrate the oscillator&#x2019;s resonant frequency in a super-regenerative receiver (SRR) and severely disrupts the receiver&#x2019;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&#x2019;s quenching period regardless of the inevitable initial phase error, and adjust SRR&#x2019;s resonant frequency accordingly. An average fractional division scheme is adopted to improve IFLL&#x2019;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 <inline-formula> <tex-math notation="LaTeX">$\mu \text{s}$ </tex-math></inline-formula> to adjust SRR&#x2019;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 &#x2212;61.2 dBm @ 200 kbps and a 3-dB bandwidth of 2.2 MHz.

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