By Marek Smoszna
Precharge common sense is utilized by numerous industries in purposes the place processor pace is the first objective, corresponding to VLSI (very huge platforms integration) functions. also known as dynamic common sense, this kind of layout makes use of a clock to synchronize directions in circuits. This finished booklet covers the demanding situations confronted by means of designers whilst utilizing this common sense type, together with common sense fundamentals, timing, noise concerns, replacement topologies and extra. additionally complex subject matters reminiscent of skew tolerant layout are lined in a few element. total this can be a accomplished view of precharge common sense, which will be invaluable to graduate scholars and architects within the box alike. it could possibly even be regarded as a supplemental identify for classes protecting VLSI.
- Comprehensive consultant to precharge logic
- Explains either the benefits and downsides to assist engineers come to a decision while to make use of precharge logic
- Useful for engineers in various industries
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Additional info for Synchronous Precharge Logic
1 shows the use of LVT devices in dynamic gates represented by circles around the LVT devices. Synchronous Precharge Logic. © 2012 Elsevier Inc. All rights reserved. 1 LVT usage. 4 Sharing Evaluation Devices The use of a single shared evaluation footer may help or hurt performance, depending on the nature of the inputs. If the clock arrives first, the larger n2 capacitance creates a better virtual ground. The circuit will thus evaluate faster. If, on the other hand, the input arrives first, then n2 is not fully discharged before evaluation.
21. This example deals with changes in voltage levels when devices switch off during a precharge phase. It shows how capacitive coupling affects a precharged gate. Capacitive coupling simply means that if one side of a capacitor changes in potential very quickly, the other side will do the same. 21 Timing for the example of transistor crosstalk. 05 V Out the current through a capacitor is equal to the derivative of the voltage across it, as shown in Eq. 24). If the voltage across the capacitor changed instantly, then the current through it would have to be infinite, which is impossible.
19 Output transition back coupling to a dynamic node. 20 Circuit for the example of transistor crosstalk. 19. Input crosstalk forward coupling, as will be discussed here. 13. Crosstalk on an input wire can result in a negative glitch. Such a negative glitch can be transmitted to a dynamic node through the gate to drain capacitance. 13. 13 Example of Transistor Crosstalk During Precharge This example deals with crosstalk through the gate to channel capacitances in a MOSFET. 21. This example deals with changes in voltage levels when devices switch off during a precharge phase.