Architectures for RF Frequency Synthesizers by Cicero S. Vaucher

By Cicero S. Vaucher

Frequency synthesizers are a necessary development block of RF communique items. they are often present in conventional buyer items, in own conversation platforms, and in optical conversation apparatus. for the reason that frequency synthesizers are utilized in many various functions, diversified functionality elements may have to be thought of in each one case. the most physique of the textual content describes a conceptual framework for reading the functionality of PLL frequency synthesizers, and provides optimization tactics for different functionality elements. The research of the PLL houses is played with using the open-loop bandwidth and section margin recommendations, to let the impression of higher-order poles to be taken under consideration from the start of the layout technique. The theoretical process research is complemented by means of descriptions of cutting edge approach and development block architectures, via circuit implementations in bipolar and CMOS applied sciences, and through size effects. Architectures for RF Frequency Synthesizers includes simple info for the newbie in addition to in-depth wisdom for the skilled clothier. it really is extensively illustrated with sensible layout examples utilized in business products.

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So, the addition of another perfect integrator in the loop’s transfer function leads to instability and oscillatory behaviour, unless further measures are taken to increase the loop’s phase margin. In order to do that, very often a resistance is placed in series with the integrator capacitor. This adds a zero to the trans-impedance function of the loop filter Hence, the RC combination causes a phase advance in the PLL open-loop response, potentially solving the stability problem (provided that the open-loop bandwidth is located in the region with the phase advance, as depicted in Figure 3-9).

For the sake of completeness, the final sections of this chapter briefly describe Direct Digital Synthesis (DDS) techniques and architectures combining DDS circuitry with PLLs. 2 INTEGER-N PLL ARCHITECTURE The single-loop integer-N PLL architecture is depicted in Figure 3-1. This architecture is by far the most popular in the industry. This is partly because of its simplicity in terms of external components and ease of application, but also because it can be produced with high reliability and occupy a small chip area.

This aspect will be treated in more detail later in this section. A large portion of Figure 3-3 is marked as “frequency jump”. g. an increase of the division ratio N in the feedback loop, whereupon the PLL must react in such a way as to increase the frequency of the VCO, so that eventually frequency and phase lock between and are restored. Note that the rising edge PLL Building Blocks 35 of which sets up active, arrives earlier than the rising edge of The up signal stays active until the next rising edge of Now there is a net output current from the charge-pump.

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