This paper extends the circuit implementation of a complex $f_s/4$ resonator based on integrators towards double-sampling. Next, an improved double-sampled circuit implementation of a complex $f_s/4$ resonator based on delays is introduced. The key features of the proposed circuit are that mismatch does not affect the center frequency nor limit the Q-factor of the resonator and lower sensitivity towards opamp gain. To verify the analytical results extracted in this paper, simulation results are presented.