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positive feedback gain of rc phase shift oscillator feedback due to rc elements feedback types of feedback negative feedback voltage series feedback voltage shunt feedback current series feedback current shunt feedback characteristics of negative feedback voltage amplifier trans resistance amplifier trans conductance amplifier current amplifier gain of positive feedback gain of negative feedback block diagram of feedback oscillator rc oscillators wien bridge oscillator frequency of oscillation op amp applicationa as rc oscillator op amp application as wien bridge oscillator types of oscillators applications of oscillators regenerative feedback lc oscillator relaxation oscillator bharkhausen criterion basic linear oscillator principles of oscillation low frequency oscillator frequency of oscillation of rc phase shift oscillt cellular radio systems communication systems analog communication modulation digital techniques coding techniques signal analog modulation angle modulation random process probability noise pulse modulation techniques multiplexing hamming code cyclic code convolutional code frequency of oscillation of wien bridge oscillato computer networks topologies layers osi model data communication system networking media star topology ring topology mesh topology paging systems cellular concept cordless cellphone systems pstn msc evolution of mobile phone pager viterbi algorithm