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　its　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.