A translinear SiGe BiCMOS current-controlled oscillator with 80 Hz–800 MHz tuning range
نویسندگان
چکیده
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 lm 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 lW/MHz The circuit serves a range of applications including agile communications, analog built-in self-test, stochastic adaptive control, spectroscopy, and bioinstrumentation.
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تاریخ انتشار 2008