Lock circuit of RFID
(3) is a series resonant double tuned BPF with impedance transformer 


high Q or over sensitive, depends on tolerances and tuning, 
high current possible limited by driver R which affects Q


(4) is a Half wave divider (think 10:1 probe) with LPF > limiter for envelope


define sensitivity needed for amount of hysteresis
note (4) will affect loading on (3) 

(5) is a baseband data receiver with R tuned OSC with sync detect and data buffers


now get cracking

P.s. I made the filter searching  for "falstad frequency response" then added parts, select then I edited values and tweaked, but you can do the math on impedance and transfer function 1st.