A high-frequency low-power sinusoidal quadratureoscillator is presented through the use of two 2nd-order low-passcurrent-mirror (CM)-based filters, a 1st-order CM low-pass filter anda CM bilinear transfer function. The technique is relatively simplebased on (i) inherent time constants of current mirrors, i.e. theinternal capacitances and the transconductance of a diode-connectedNMOS, (ii) a simple negative resistance RN formed by a resistor loadRL of a current mirror. Neither external capacitances nor inductancesare required. As a particular example, a 1.9-GHz, 0.45-mW, 2-VCMOS low-pass-filter-based all-current-mirror sinusoidal quadratureoscillator is demonstrated. The oscillation frequency (f0) is 1.9 GHzand is current-tunable over a range of 370 MHz or 21.6 %. Thepower consumption is at approximately 0.45 mW. The amplitudematching and the quadrature phase matching are better than 0.05 dBand 0.15°, respectively. Total harmonic distortions (THD) are lessthan 0.3 %. At 2 MHz offset from the 1.9 GHz, the carrier to noiseratio (CNR) is 90.01 dBc/Hz whilst the figure of merit called anormalized carrier-to-noise ratio (CNRnorm) is 153.03 dBc/Hz. Theratio of the oscillation frequency (f0) to the unity-gain frequency (fT)of a transistor is 0.25. Comparisons to other approaches are alsoincluded.