1. Alma Delic, A., et al.: Programmable state-variable filter with wide frequency and Q tuning range. Int. J. Electron. Electr. Eng. 3(3), 207–211 (2015)
2. Analog Devices: ADG601/602 SPST switches. ADG601/602 datasheet
3. Analog Devices: AD8336 wide bandwidth, DC-coupled VGA. AD8336 datasheet
4. Analog Devices: AD4817-1 low-noise, 1 GHz, FastFET Op Amps. AD4817 datasheet
5. Analog Devices: ADL5391 DC to 2 GHz, multiplier. ADL5391 datasheet