The paper presents a newly designed structure of a low-voltage differential difference amplifier (DDA). The novel implementation brings significant reduction of complexity in comparison to readily available operational amplifiers-based approach. It was designed in Cadence IC6 Spectre in 0.18 m TSMC technology operating correctly with only 0.9 V supply voltages and fabricated in EUROPRACTICE IC Service. Designed DDA features wide linearity and dynamics of output voltage together with operational bandwidth up to 100 MHz. Detailed simulation results and new voltage-mode second-order all-pass/notch filter are included to prove its superior behavior.