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This paper presents an enhanced digital tuning approach for RC-active direct form circuits. By introducing a combined summing/dividing network for the current that flows from resistors to virtual grounds, an accurate frequency trimming is accomplished bringing out a linear dependence on the digital input code over a wide tuning range. Simulation results of a monolithic 12-bit 1.8 V–0.18 μm CMOS second...
This paper presents a CMOS 1.8 V–0.18 μm quadrature sinusoidal oscillator designed for its application as the actuation system in portable frequency-domain sensing devices, such as impedance spectroscopy or resonant readout systems. It is based on an analog implementation, to preserve low-voltage low-power operation with a compact topology. The oscillation frequency can be digitally set by a novel...
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