An　improved　gyrator-capacitor　(GC)　architecture　of　active　inductor　(AI)　is　proposed,　which　consists　of　a　dual-loop　configuration,　mainly　including　a　negative　feedback　loop　(NFL)　and　a　positive　feedback　loop　(PFL)　and　hence　is　denoted　as　positive-negative-feedback-GC　(PNF-GC).　The　in-depth　cooperation　of　above　dual-loop　configuration　in　conjunction　with　the　dynamically　and　synergistically　tuning　of　external　voltages　in　different　building　modules　ensure　high　Q　values　under　low-frequency　range　and　alleviate　the　degradation　impact　of　the　parallel　conductance　Gp　on　Q　values　under　high-frequency　range,　and　thereby　the　proposed　PNF-GC　architecture　can　make　a　single　AI　achieve　high　Q　values　under　various　radio-frequency　bands.　Subsequently,　based　on　the　TSMC＇s　0.18-μm　CMOS　process,　a　prototype　circuit　of　AI　based　on　PNF-GC　architecture　as　an　exemplary　example　and　its　layout　are　given,　so　as　to　demonstrate　the　performance　under　quad　bands　including　X,　C,　S　and　L　bands.　The　results　from　post-layout　simulation　indicate　that　within　the　frequency　range　of　the　X-band　(8–12　GHz),　the　Q　values　are　all　higher　than　20,　with　a　maximum　Q　value　of　1068　at　10.2　GHz;　within　the　C-band　(4–8　GHz),　the　all　Q　values　exceed　50　and　the　maximum　Q　value　reaches　1006　at　6　GHz;　within　the　S-band　(2–4　GHz),　the　all　Q　values　surpass　250,　with　a　peak　Q　value　of　1033　at　3　GHz;　and　within　the　L-band　(1–2　GHz),　the　Q　values　are　all　higher　than　590　and　a　peak　Q　value　of　1026　appears　at　1.5　GHz.　The　above　proposed　PNF-GC　architecture　of　AI,　which　makes　a　single　AI　have　an　ability　to　obtain　high　Q　within　a　wide　frequency　range,　is　of　important　significance　to　frequency　reconfigurability　of　miniaturized　RFICs.　©　2024　Elsevier　Ltd