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This work presents a hybrid and highly adaptive phase locked loop (PLL) system for spin torque oscillators (STO) which are candidates for the next technological implementation of microwave applications. PLL operation is successfully demonstrated in the lower ultra high frequency (UHF) band using a vortex based STO revealing an in-band phase noise of less than −80 dBc/Hz and PLL bandwidth of 2.5 MHz...
This work comprises an extended and comprehensive evaluation of idealized class-E operation with finite DC-feed inductance. It exhibits an analysis of varying switching duty cycle as well as varying switch voltage slope at switch-on time. As a result of this special cases for idealized class-E operation able to maintain efficient zero-volt switching while the load resistance changes is revealed which...
In order to design and simulate broadband communication systems like Ethernet, accurate models up to 375 MHz and efficient simulations are necessary. This paper provides an approach to model analog two-port systems using impedance parameters purely in the digital domain. The twisted-pair copper line is modelled based on frequency dependent impedance parameters gained from FEM (finite element method)...
This work presents an integer-N divider based on multi-modulus frequency dividers (MMDs) which covers a continuous integer-N divider ratio range of 8 to 127 and was built using current mode logic (CML). A new powerful and simple modulus extension for MMDs optimized for fast CML implementations is demonstrated. The proposed divider is a hybrid composition of emitter coupled logic (ECL) stages and source...
A consistent graph is a graph with zero cyclic sum of weights of edges along all loops. Given a number of possible weights for each edge, we study the problem of synthesizing consistent graphs, i.e. to find the appropriate combinations of weights, which form consistent graphs. This problem plays an important role in, e.g. source localization based on time difference of arrival (TDOA). By using the...
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