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This letter presents an ultra-low voltage quadrature voltage-controlled oscillator (QVCO). The LC-tank QVCO consists of two low-voltage voltage-controlled oscillators (VCOs) with the body dc biased at the drain bias through a resistor. The superharmonic and back-gate coupling techniques are used to couple two differential VCOs to run in quadrature. The proposed CMOS QVCO has been implemented with...
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