Hua-Pin Chen San-Fu Wang Yitsen Ku Yuan-Cheng Yi Yi-Fang Li Yu-Hsi Chen Four Unity/Variable Gain First-Order Cascaded Voltage-Mode All-Pass Filters and Their Fully Uncoupled Quadrature Sinusoidal Oscillator Applications. 6250 2022 22 Sensors 16 https://doi.org/10.3390/s22166250 db/journals/sensors/sensors22.html#ChenWKYLC22
