nrk1
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There are a lot of ways of tuning the time constants. One is to use a PLL as Dan Clement said. You can also use an integrator and adjust things based on the ramp. For measurements, you have to use buffers and calibrate out its response. See the paper below(Fig. 1c, Fig. 8b) and references [3,9].
Nagendra Krishnapura, Abhishek Agrawal, and Sameer Singh, "A High IIP3 Third Order Elliptic Filter with Current Efficient Feedforward Compensated Opamps," IEEE Transactions on Circuits and Systems II-Express Briefs, vol. 58, no. 4, pp. 205-209, April 2011.
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