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The linear model of phase locked loop which is proper for investigating of phase noise properties in the frequency domain is presented in this contribution. For simulation on PC analog-digital circuit analysis program Micro-Cap is used. Verification of the MC numerical simulations was done by MATLAB and measurements on the prototype were carried out. Based on numerical simulations results it is possible...
The linear model of phase-locked loop with triple active RC notch filters (ARCN) which is proper for investigating of dynamic properties in the time domain and frequency domain are presented in this contribution. Also the noise analysis and noise optimization of such filters were carried out. Spectral properties and phase noise measurement on experimentally evaluated frequency synthesizer were carried...
Design procedure and experimental verification of linearized power detector, suitable for measurement purposes, are presented. Good linearity, fast response and wide dynamic range of the detector are achieved by using a zero-bias Schottky diode with 16-bit analog to digital converter and 60 MHz 32-bit RISC processor. Linearity error better than plusmn 2 % has been achieved in 40 dB dynamic range with...
Frequency, transient and noise numerical analysis of a triple active RC notch filters (ARCN filters) are presented in this contribution. ARCN filters analyzed here are used for additional damping of the first unwanted harmonics (1., 2. and 4. ) at the phase detector output voltage. Every additional passive filter inside the PLL very often causes instability due to its too big additional phase shift...
A new version of RF oscillator with high linearity (THD<1%) and wide zone of adjusting its amplitude (min. 40 dB) is presented in this contribution. Oscillator is designed for single and quickly measurement of non-linearity effects in varactor-tuned LC resonators, and it is usable in frequency band from LF up to 50 MHz. Active part of the oscillator consist of high-speed OA of type VFB (voltage...
This paper introduces a new method for extraction parameters of quartz equivalent circuit. Temperature dependencies of parameters in extended temperature range were carried out by measurement by a six port reflectometer. The algorithm was implemented in Matlab language with programmed graphical user interface.
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