https://www.dsprelated.com/showthread/comp.dsp/38610-2.php
comp.dsp | Frequency multipliers: A way around Nyquist limitations?| page 2
posts 11-20 - I was wondering... Say I happen to have a 100MHz DAC around... if I had a perfect anti-imaging filter, I could get 50MHz of bandwidth from it,...
frequency multipliersa waycompdsp
https://pure.kfupm.edu.sa/en/publications/new-cfoa-based-lossless-floating-inductor-and-capacitanceresistan/fingerprints/
New CFOA-Based Lossless Floating Inductor and Capacitance/Resistance Multipliers for Low Frequency...