Novel tunnel-diode amplifier circuits have been introduced for stable operation. Stability criteria have been established by which these amplifier circuits can be made unconditionally stable.nThe operation of the Doppler tracking loop of a coherent radar is investigated with regards to two indices of performance:I) low-deviation and 2) low rate-of-change of the input frequency modulation. Of particular interest is the case where the f-m modulation arises from rotation of the missile antenna.
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