Document Type
Thesis
Date of Award
5-31-1988
Degree Name
Master of Science in Electrical Engineering - (M.S.)
Department
Electrical Engineering
First Advisor
Jacob Klapper
Second Advisor
Joseph Frank
Abstract
In this thesis, a second-order, type-one PLL ( Phase- Lock, Loop ) in which the usual lead-lag loop filter is paralleled with a Hilbert Transformer (the whole system is called HPLL) is analyzed. A motivation for the study was that earlier researchers have found improved performance if Ilse lead-lag network is paralleled by a differentiator, result mg in the so called ERPIM (Extended-Range Phase-Locked Demodulator). For the purpose of com-parison with earlier experimental and analytical results on the PLL and the ERPLD, the numerical results in this thesis ale based on the parameters of Acampora and Newton.
The basic characteristics of the ERPLD and the HPLL operating in the linear mode including the open- and closed-loop responses are generated and compared against those of the conventional I'LL. An optimum design for these PLLs Is presented for a useful modulation type which is a single- channel FM speech signal. This optimum design is in terms of threshold performance and verifies that the ERPLD has superior performance and predicts that the HPLL has inferior performance over the conventional PLL.
Some conclusions for the HPLL ate as follows:
o Almost no peak response and broader bandwidth are found in the closed-loop response.
o Much smaller angles of the phase-shift response than the conventional PLL are obtained.
o Compared with the conventional PLL of the ERPLD, the threshold values are worse.
Recommended Citation
Lin, Inn-Shian, "An analysis of the second-order, type-one Hilbert phase-locked loop" (1988). Theses. 3141.
https://digitalcommons.njit.edu/theses/3141
