Tuning circuits with a wide tuning range and a method of tuning an integrated circuit (IC) are disclosed. An embodiment of the disclosed circuits includes varactor banks coupled in series. Each of the varactor banks may include multiple variable capacitors coupled in parallel. A control voltage is routed through the series of varactor banks to adjust the frequency range of the tuning circuit. The control voltage can be selectively routed through one or more of the series of varactor banks based on the operating frequency of the tuning circuit. Enable circuits may be used to control how the control voltage is routed to achieve a specific frequency.