Realization of An Inexpensive Multi-Channel Frequency Synthesizer

We present a high-precision RF synthesizer that uses phase locked loops for deriving multiple outputs for applications in atomic physics such as optical lattices and atom interferometry. The synthesizer utilizes inexpensive, readily-available components to produce dual RF outputs that are tunable over $\sim50$ MHz in the vicinity of 250MHz. The difference frequency between the outputs can be tuned from $\sim10$ mHz to 50 MHz. We achieve exceptional frequency stability by using a rubidium reference at 10 MHz. The RF outputs are also phase stabilized using a feedback loop so that the phase remains constant as the frequency is changed.