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Local positive feedback in a delay element enables a ring oscillator with only two stages to oscillate and produce quadrature clocks. Routh-Hurwitz's criterion is applied to prove that such a structure can oscillate. An internally generated power supply from a constant-gm bias keeps the free running frequency to within plusmn 5% from -40 to 125degC over(More)
A PWM ADSL2+ line driver with 2.2MHz signal bandwidth is realized in a 3 metal, 2 poly 0.35µm CMOS process. A low 8.832MHz switching frequency is used with filtering in the feedback path to suppress aliasing. Signal processing and triangular wave generation are combined in the forward integrators. The driver delivers 100mW to a 100Ω line with(More)
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