Gm-C filters are the most popular technique used in implementing integrated continuous-time filters. In the study, we proposed a 4th order differential Gm-C band-pass filter using improved floating current sources. The improved current source structure is simple and includes fewer transistors. This provides an effective use of the chip area and brings simplicity to the design of circuits. Thus it reduces the investment cost. The proposed filter structure does not contain the resistor which is very important for integration. All capacitors in proposed filter are grounded which reduces the parasitic effects. The proposed filter is simulated using CMOS TSMC 0.18 mu m technology. Simulation results are given to confirm the theoretical analysis.