Crystal Clock
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 SWISS ARMY VICTORINOX DUAL TIME TRAVEL ALARM CLOCK INC 33583 RARE 2001 NIB NR  US $150.00
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 Vintage Heavy Iron F Kroeber Mantle ClockFor Parts or RepairsCirca 1800s US $49.99
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 Bulova Olympia Chrome Crystal Alarm Clock B6886 w Swarovski crystals US $85.00
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 BULOVA B0019 MINIATURE MINI CINDERELLA COACH BRAND NEW US $98.00
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 Bulova Insignia Alarm Clock B6876 Floral Swarovski Crystal Pattern Swivel Cover US $85.00
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 1890 Mercury French Crystal Regulator Pendulum US $87.00
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 TiffanyCO brass desk shelf clock Great condition with boxpapers 45000 retail US $59.99
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 Howard Miller Desk Clock Model 645 530 Working US $20.00
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 Lead Cyrstal Quartz Mantel Clock Very Very Pretty LQQK US $4.99
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 VINTAGE DESKTOP LOOPING 15 JEWELS 8 DAYS ALARM CLOCK RARE EXCELLENT CONDITION US $51.00
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 Lot of 5 Mantel Clocks US $20.00
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 Chrome Vintage Seth Thomas School Clock circa 1960 1970s Model SS18C Works US $26.00
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 GE General Electric 14 vintage School Wall Clock US $52.00
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 Phinney Walker Semca Rhinestone Clock Ice With Filigree US $42.49
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 Phinney Walker Semca Rhinestone Clock Ice Blue ON SALE NOW US $53.81
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 Vintage German Brass Seth Thomas Working Wind Up Alarm Clock US $9.99
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 Antique TELECHRON CLOCK Promotional Advertising HALLIBURTON Rare USA Vtg 1940s US $69.99
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 Vintage Godinger Crystal Legends Domed Mantel Clock Quartz movement US $13.95
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 Phinney Walker Semca Rhinestone Clock Ice With Starburst Shape ON SALE US $43.47
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 Art Deco Style Sessions Wooden Electric Mantel Clock Sold in As Is Condition US $11.99
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 Tourbillon Escapement Gold Plated Crystal Regulator US $330.87
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 Waterford Crystal mantle clock US $50.00
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 Montblanc travel alarm clock US $67.00
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 VERY FINE CARVED WALNUT 3P BLACK FOREST CLOCK SET1880 US $5,250.00
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 BEAUTIFUL LEAD CRYSTAL BADASH MINIATURE DESK CLOCK US $8.99
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 RUE DE LA PAIX Paris Lamp Post Mantle Clock US $199.00
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 Crystal Football Clock Paperweight US $4.99
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 MINIATURE CLOCK IN GIFT BOX BIBLE With CROSS CLOCK ELGIN NIB US $49.99
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 ANTIQUE MANTEL CLOCK AMERICAN CHIME CLOCK COMPANY US $74.95
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 Seiko Melodies In Motion Wall Clock 12 Song Collectors Edition QXM142BRH US $43.90
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 Old brass crystal mechanical ball pocket clock watch US $.21
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 WWII KIENZLE GERMAN 8 TAGE MILITARY ARMY CLOCK WOOD MANTLE FRAME PARTS STEAMPUNK US $49.99
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 Waterford Ireland Crystal Domed Quartz Clock US $50.00
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 Franncois Gilbert A French Gilt Brass Table Clock Circa 1740s US $4,300.00
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 ROYAL DUX BEAUTIFUL CLOCK 325 WIDE GERMAN MOVEMENT 18192 3S 080 US $37.00
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 Cartier Prism Mystery Desk Timepiece Circa 1980s US $5,900.00
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 Meridian Wareford Crystal clock US $40.00
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 Waterford octagonal crystal clock US $23.00
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 M42E VINTAGE LINCOLN ELECTRIC MANTEL CLOCK US $4.99 |
 JAEGER LECOULTRE REVERSO LARGE WALL CLOCK NEW US $749.00
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 Neat antique Westclox Baby Ben alarm clock From the 1950s Made in the USA US $18.00
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 Vintage 1950s SETH THOMAS Desk Clock AC Powered Roman Numerals US $24.99
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 Mikasa Quartz Made in Germany Crystal Starfire Mantel Desk Clock US $26.00
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 ROYAL DUX DALI CLOCK 18122 S 61 GERMAN MOVEMENT US $175.00
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 ROYAL DUX BEAUTIFUL CLOCK 18035 S 311 10 TALL 7 WIDE GERMAN MOVEMENT US $149.00
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 collectable Victorian Crystal Ball Mechanical Pocket Watch Clock US $.07
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 old 6 high verticle crystal regulator mantle clock gong US $3.99
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 Telechron Art Deco Mirror Shelf Mantel Clock Model 3F65 Iris US $5.50
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 Elegant Telechron Model 7822 Alarm Clock Walnut Case Working Condition US $9.99
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 Crown Grandfather clock from shannon fine crystal US $15.99
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 Vintage Seth Thomas Severn Alarm Clock US $29.99
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 Mikasa Monarch Frosted Crystal Clock US $14.99
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 Staiger Quartz Clock Made in West Germany French Crystal US $17.50
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 VTG Crystal Legends Clock by Godinger 24 Lead Crystal Cool US $15.00
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 FERRIS WHEEL FALLING BALL BEARING GRAVITY DRIVEN MANTLE CLOCK No Winding US $426.99
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 Victorian Crystal Ball mechanical watch clock diameter 50mm 1 80 US $.99
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 Seiko Special Collector Edition Clock US $41.00
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 1952 Jaeger Le Coultre ATMOS clock cal 519 FreeWorldwSH US $1,190.00
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 BRAND NEW WATERBURY CLOCK CO BY TIMEX RED HAT CLOCK US $7.50
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 Seth Thomas Angelina Crystal Anniversary Clock ACL 210 new in box US $29.99
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 Technomarine Moonsune ladies pink ceramic chronograph 200M watch second hand 90 US $999.00
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 Vintage Black Baby Ben Westclox Alarm Clock Works Great 4 Diameter US $4.99
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 SEIKO MANTLE DESK WORLD TIME CLOCK QQZ292G GOLD BRASS TONE NAUTICAL 11 1 2 TALL US $49.99
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 VINTAGE CYMA 15 JEWEL ALARM CLOCK ORNATE AND CHARMING SWISS MADE NO RESERVE US $.99
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 RARE IMHOF GUILLOCHE ENAMEL AND MARCASITE DIAL DESK MANTEL CLOCK WORKING GOOD US $189.00
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 1920 Waltham 8 Day Clock From Hudson Super Six WORKING GOOD CONDITION US $60.00
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 ANTIQUE CELLULOID ALARM CLOCK US $4.99
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 Crystal clock Brand New Made in Germany Quartz Carriage Clock by Godinger US $9.99
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 Space Age Rhythm Alarm Clock Funky Mid Century Vintage Japanese Retro Design US $59.00
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 ANSONIA CLOCK CO ORIGINAL PORCELAIN CRYSTAL REGULATOR DIALS US $19.99
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 6xIN 12 Nixie Tubes Clock led backlight and alarm steampunk vintage retro watch US $219.00
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 1950 vintage General Electric kitchen wall clockmodel 2H115 US $35.00
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 early 70s General Electric kitchen wall clock excellent condition US $40.00
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 vintage Lux electric kitchen wall clock sixties style perfect condition US $30.00
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 SETH THOMAS MANTLE CLOCK MOVEMENT VINTAGE MOVEMENT FOR PARTS OR REPAIR MADE USA US $7.99
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 GALWAY IRISH CRYSTAL ROUND CLOCK MADE IN GALWAY IRELAND NIB US $19.99
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 Howard Miller Worthington Mantle Clock German Westminster 613 102 MSRP $1089 US $55.00
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 Beautiful Crystal Staiger German Clock US $14.99
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 VINTAGE CLOCK LOT OF 4 SEIKO SETH THOMAS DUNHAVEN STAIGER 3 ARE GERMAN GERMANY US $69.99
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 Vintage Godinger Crystal Legends Domed Mantel Clock US $17.99
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Clock Jitter Attenuation
Clock generator signals provide reference timing to every integrated circuit and electrical system. While consumer applications typically use simple quartz crystals for reference clock generation, other applications have much more sophisticated timing requirements and often require a combination of clocks to provide synchronization, generation and distribution. In applications like wireless infrastructure and medical imaging, which require high fidelity analog to digital signal conversion, next-generation designs require higher resolution and faster data transmission rates. Next-generation, high-performance networking and communications applications require faster transmission rates and higher speed data processing. In these applications, clock signals play a vital role in the overall architecture. If not designed properly, the system-level performance of these applications can be limited by the performance of the underlying timing solution. Special care must be taken during the device selection and hardware design process toensure that the clocking design maximizes system performance.
Phase Noise and Clock Jitter
The quality of a clock signal is heavily dependent on its phase noise and jitter. An ideal clock source would generate a pure sine wave. All signal power would be generated at one frequency. However, in actuality, all clock signals have some degree of phase-modulated noise. This noise spreads the power of the clock signal to adjacent frequencies, resulting in noise sidebands. The phase noise is typically expressed in dBc/Hz and represents the amount of signal power at a given sideband or offset frequency from the ideal clock frequency. Radio frequency (RF) and analog-to-digital data conversion (ADC) applications require very low phase noise clocks. In RF applications, increased phase noise can create channel-to-channel interference, degrading RF signal quality. In ADC applications, increased phase noise can limit the signal-to-noise ratio (SNR) and equivalent number of bits (ENOB) of the data converter.
Phase noise is the frequency domain representation of clock noise. Phase jitter, on the other hand, is the time domain instability of the clock signal and is typically expressed in picoseconds (ps). Jitter can be described as the random variation in the actual clock signal's edges versus its ideal waveform. Phase jitter is the figure of merit in high-speed digital applications including data communications, networking and high-definition video transmission. These applications require multi-gigabit data transmission rates as high as 40 Gbps. Physical-layer transceivers used in networking and HD video rely on low jitter reference clocks that are internally multiplied within the transceiver to clock the high-speed data transmitted from the device. Excessive clock jitter can lead to higher bit-error rates that may exceed system-level requirements.
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About the Author
Silicon Labs - USB Microcontrollers and Clock Generators. Industry leader in the innovation of high-performance, analog-intensive, mixed-signal ICs.
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