The document lists useful links related to front-end circuit design for ultra-wideband receivers, analog adaptive filters, Verilog-AMS language reference, using Verilog-A in advanced design systems, phase locked loop mixed signal design flows, model driven architecture methodologies for mixed-signal designs, defining subnetworks in ADS, tutorials on using the mixer design guide in ADS, simulating noise figure in ADS, Cadence LNA design, Cadence tutorials, and feedback systems in Matlab. The links are dated November 18, 2019 and provided on a website for circuit design.