{"title":"A High-Frequency Low-Power Low-Pass-Filter-Based All-Current-Mirror Sinusoidal Quadrature Oscillator","authors":"A. Leelasantitham, B. Srisuchinwong","country":null,"institution":"","volume":18,"journal":"International Journal of Electronics and Communication Engineering","pagesStart":1227,"pagesEnd":1233,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/163","abstract":"A high-frequency low-power sinusoidal quadrature\r\noscillator is presented through the use of two 2nd-order low-pass\r\ncurrent-mirror (CM)-based filters, a 1st-order CM low-pass filter and\r\na CM bilinear transfer function. The technique is relatively simple\r\nbased on (i) inherent time constants of current mirrors, i.e. the\r\ninternal capacitances and the transconductance of a diode-connected\r\nNMOS, (ii) a simple negative resistance RN formed by a resistor load\r\nRL of a current mirror. Neither external capacitances nor inductances\r\nare required. As a particular example, a 1.9-GHz, 0.45-mW, 2-V\r\nCMOS low-pass-filter-based all-current-mirror sinusoidal quadrature\r\noscillator is demonstrated. The oscillation frequency (f0) is 1.9 GHz\r\nand is current-tunable over a range of 370 MHz or 21.6 %. The\r\npower consumption is at approximately 0.45 mW. The amplitude\r\nmatching and the quadrature phase matching are better than 0.05 dB\r\nand 0.15\u00b0, respectively. Total harmonic distortions (THD) are less\r\nthan 0.3 %. At 2 MHz offset from the 1.9 GHz, the carrier to noise\r\nratio (CNR) is 90.01 dBc\/Hz whilst the figure of merit called a\r\nnormalized carrier-to-noise ratio (CNRnorm) is 153.03 dBc\/Hz. The\r\nratio of the oscillation frequency (f0) to the unity-gain frequency (fT)\r\nof a transistor is 0.25. Comparisons to other approaches are also\r\nincluded.","references":null,"publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 18, 2008"}