A 3-phase current controlled sinusoidal oscillator, tunable over a wide range of frequencies is presented. The oscillator comprises a ring of 3 cascaded differential Gm − C low-pass filter stages, implemented in a fully translinear, NPN-only circuit. Closed-form analytical expressions are derived to quantify both frequency and amplitude tuning, as a function of two current biases. Experimental results from a 0.5 μm SiGe BiCMOS chip demonstrate 7 decades of tuning range, from 80 Hz to 800 MHz, as well as low harmonic distortion. Power consumption scales with oscillation frequency, measuring 2 μW/MHz The circuit serves a range of applications including agile communications, analog built-in self-test, stochastic adaptive control, spectroscopy, and bioinstrumentation.