numericals sampling pcm positive feedback mathematical analysis rcc phase shift oscillator wien bridge oscillator clapp's oscillator colpitt's oscillator hartley oscillator barkhausen's criteria types of oscillators phase margin gain margin nyquist criterion stability transresistance amplifier transconductance amplifier voltage amplifier current amplifier feedback concept current-shunt current-series voltage-shunt voltage-series output impedance input impedance gain frequency response dpcm comparision of various pcm techniques adaptive dm delta modulation quantization companding
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