John A. McNeill's The Designer's Guide to Jitter in Ring Oscillators PDF
By John A. McNeill
The Designer’s consultant to Jitter in Ring Oscillators presents details for engineers on designing voltage managed oscillators (VCOs) and phase-locked loops (PLLs) for low jitter functions similar to serial info communique and clock synthesis. the fabric is gifted in a transparent, intuitive model at either the method point and the circuit point to aid designers increase their realizing of basic noise assets and layout low jitter circuitry inside strength, sector, and technique constraints in order that final functionality meets process point necessities.
At the procedure point, the authors describe and specify diversified tools of measuring jitter to symbolize time area uncertainty. even if the emphasis is on time-domain measures of oscillator functionality, an easy approach to translating functionality to frequency area (phase noise) measures can be incorporated.
At the circuit point, the authors comprise strategies for layout of low jitter hold up parts to be used in ring oscillators, in addition to pertaining to the circuit-level features to system-level functionality. The authors talk about a class scheme for hold up levels to assist advisor the designer’s selection in regards to sign style (single-ended vs. differential), output layout (single part vs. a number of phase), and tuning technique. basic mathematical expressions are built describing the noise-power tradeoffs for every form of degree, so the clothier can speedy estimate the ability dissipation required to accomplish a wanted point of jitter.
The Designer’s consultant to Jitter in Ring Oscillators is a superb source for engineers and researchers drawn to jitter and ring oscillators and their software in communique systems.
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Extra resources for The Designer's Guide to Jitter in Ring Oscillators
Therefore, to achieve a 90o phase difference, the two outputs should be taken from points in the ring separated by half the ring length. 21, a separation of two gate delays is required, so the I and Q outputs are taken from gates B and D. As in the previous section, the ring stages are not loaded uniformly, so there may be some nonuniformity of phases within the ring. However the critical 90o phase relationship depends on matching of the sums (A+B) and (C+D) of the oscillator stage delays. If necessary, dummy stages can be added for uniform loading as described in the previous section.
In this book we will assume that the dominant source of jitter is the VCO. Therefore we must be concerned with the phase transfer function from the VCO to the clock output. Following is a brief analysis of phase noise at the output due to the VCO. 5 shows a block diagram of the PLL as a control system, where the controlled variable is phase. θi is the input phase from the transmit clock that the PLL is trying to track. θo is the phase of the VCO output clock. θn represents the phase noise of the VCO referred to its output.
However, the gate circuit is composed of two cross-coupled inverters which are referenced to VSS and do not have the same degree of common mode rejection as the current source biased differential pair. Advantages of the pseudo differential approach include • • Signal swing In most cases, pseudo differential techniques allow the use of signals that swing the full range from VSS to VDD , improving jitter. Some rejection of amplitude coupling from supply/substrate interference With symmetric layout and good matching between the two sides of the pseudo differential circuit, there can be a reduction in the amplitude coupling interference mechanism described earlier.
The Designer's Guide to Jitter in Ring Oscillators by John A. McNeill