standard cell


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

standard cell

[′stan·dərd ′sel]
(electricity)
A primary cell whose voltage is accurately known and remains sufficiently constant for instrument calibration purposes; the Weston standard cell has a voltage of 1.018636 volts at 20°C.

Standard Cell

 

a galvanic cell with a stable electromotive force (EMF) that is highly reproducible from cell to cell.

Standard cells can be saturated or unsaturated, depending on the concentration of the electrolyte within the cell. Saturated Weston standard reference cells are the most stable and reproducible. A Weston standard cell has Hg as the positive electrode and a 10 percent Cd amalgam as its negative electrode. The electrolyte is a saturated solution of CdSO4. Unsaturated Weston standard cells differ from saturated ones in that their electrolyte, which is an aqueous solution of CdSO4, does not contain any crystals of 3CdSO4 · 8H2O at temperatures above 4°C. At 20°C, the EMF of a saturated Weston standard cell ranges from 1.01850 to 1.01870 volts (V), within an accuracy of up to 10-5 V; for unsaturated standard cells this range is from 1.0186 to 1.0194 V, within an accuracy of up to 10-4 V. The actual EMF of a saturated standard cell at temperatures other than 20°C can be determined using the formula

Et = E20 – 0.00004 (t – 20) – 0.000001 (t – 20)2

where E20 is the EMF of the standard cell at 20°C. For unsaturated standard cells the change of EMF with temperature is usually ignored.

A Clark standard cell has the same positive electrode as a Weston standard cell, but its negative electrode consists of a 10 percent zinc amalgam, and its electrolyte is a saturated solution of ZnSO4 with an excess of ZnSO4 · 7H2O crystals. The EMF of a Clark cell is 1.432 volts from 0° to 30°C. In the USSR, the Clark standard cell is rarely used.

Saturated standard cells are used as reference standards for precise measurements of EMF. They are sensitive to shaking and tilting. Unsaturated standard cells are used as reference sources of EMF in industry and in portable electrometric instruments. They are less sensitive to mechanical disturbances than saturated standard cells.

REFERENCE

Elektricheskie izmereniia: Sredstva i metody izmerenii. Edited by E. G. Shramkov. Moscow, 1972.

standard cell

The most common ASIC development technology. Each standard cell vendor has its own library of circuits that range from primitive logic gates to more complex functions such as memory blocks and microprocessor cores. Based on the customer's design, the required circuits are placed on the chip and connected using "place-and-route" software. Unlike gate arrays, which are partially fabricated chips with repetitive blocks of unconnected transistors, standard cell designs are created on blank wafers. They are more efficient and use less silicon real estate than gate arrays. See gate array and ASIC.
References in periodicals archive ?
1] to a definite value in the usual manner by reference to an auxiliary standard cell.
and "coarse", and the coil E and slide wire F, which serve, in connection with an auxiliary standard cell, to adjust the main-dial current to exactly 2 milliamperes.
Quality of standard cell libraries is critical for fist-pass silicon success of SoC designs.
Structured ASICs can be implemented in a fraction of the time and upfront cost as Standard Cell ASICs.
The ARM Metro standard cell library is immediately available for licensed customers to download at no charge via the ARM website at www.
The ASAP Logic Ultra-High-Density (UHD) standard cell library typically provides up to 30 percent smaller area when compared to conventional standard cell libraries.
ZenTime-GT is tightly integrated with placement and static timing analysis engines and can be plugged directly into existing standard cell design flows.
The Virtual Silicon Standard Cell Library includes 352 standard cells and implements Virtual Silicon's Gate Bias Technology for a greater than 100X leakage improvement with no performance impact and minimum area impact of less than 3%.
Architected to extend battery life in low-power designs, the integrated IPrima Mobile Platform is comprised of Area, Speed and Power (ASAP) Memory Ultra-Low-Power (ULP) compilers, ASAP Logic ULP standard cells and Base I/O libraries.
LTC manufactures a variety of standard cells that are assembled into custom large batteries complete with electronics (battery management systems) and electronics to communicate with other components of the system for performance monitoring.
Tower Semiconductor's standard cells, I/Os and memory compilers, for use in complex system-on-chip (SoC) designs, are based on Synopsys' library technology, and are available to Tower customers at no charge.
amp; MIGDAL HAEMEK, Israel -- Tower's Complete Set of Standard Cells, I/Os and Memory Compilers Available to More Than 25,000 Designware Library Users

Full browser ?