Silicon Chip Capacitors CAPACITANCE FREQUENCY SELECTION GUIDE CRO

The Datasheet Archive - 100 Million Datasheets from 7500 Manufacturers.

Silicon Chip Capacitors CAPACITANCE FREQUENCY SELECTION GUIDE CRO

Datasheet Thumbnail

Top Searches for this datasheet

Capacitance Selection Guide Cross Reference
Silicon Chip Capacitors
CAPACITANCE FREQUENCY SELECTION GUIDE CROSS REFERENCE
Vishay's series high-precision, silicon capacitors features unprecedented capacitance frequency stability. That capacitance curve relative frequency very flat. This feature enhances high-frequency applications because frequency drift circuit does cause significant change capacitance over wide range around working frequency. result, capacitors significantly more stable than traditional capacitors. Historically, precision capacitors have been either single-layer, low-temperature co-fired ceramic chip (LTCC) capacitors single-layer, thin film (TF) dielectric capacitors. Prior introduction Vishay capacitors, these were recognized most stable types chip capacitors high frequencies with highest self-resonant frequency (SRF). Frequency performance summarized data points known S-parameters, which indicate transmission loss characteristics. S-parameters well-known industry, simulation systems have used these parameters characterize capacitor performance over wide range frequencies. Figure shows much 10-pF capacitor representing Vishay's series, well LTCC technologies, will change frequencies GHz. representative curve each capacitor approaches vertical capacitor approaches SRF. SRF, capacitance immediately drops zero and, because longer functioning capacitor, device typically effective above SRF. fact, generally recommended that capacitors used even below their frequency range where capacitance changes rapidly with small change frequency, such above examples shown Figure Therefore, rule thumb traditional capacitors limit their operation less than one-third their
CAPACITANCE FREQUENCY
seen Figure that, when these LTCC capacitors used above GHz, small drift frequency will cause large change capacitance. typical application, such impedance matching between power amplifier (PA) antenna mobile phone, this could very important. large change capacitance will cause mismatch impedance, resulting much signal output being reflected back into phone instead being transmitted antenna. phone will then attempt boost output signal, draining battery while trying increase transmitted signal. capacitance stability HPC0402 silicon capacitor shown Figure which demonstrates much better frequency stability than other technologies, eliminates problem. Figure illustrates data with which capacitor selected specific operating frequency.
CAPACITANCE FREQUENCY
17.00 16.00 15.00 14.00
LTCC ThinFilm
13.00 12.00 11.00 10.00 9.00 8.00 1000 1500 2000 2500 3000 3500
easured Agilent 4287 16197
FREQUENCY (MHz)
Figure Capacitance Frequency Data Capacitor Selection Consider, example, case which user requires 13-pF capacitor GHz. Capacitors supplied with capacitance value measured MHz. user consults characterization data finds that value demands LTCC capacitor. drawback working with these technologies two-fold. capacitor working region where LTCC capacitance changes quickly with small change frequency, they each exhibit curves which diverge with wider tolerance drift frequency increases. result, user must specify order tighter tolerance remain within allowable error envelope operating frequency. comparison, silicon capacitors provide much more uniform capacitance curve over wide frequency range. contrast capacitance increase LTCC devices with rise frequency, silicon
www.vishay.com
CAPACITANCE (pF)
Thin Film Technology LTCC Technology Vishay-HPC 1000 FREQUENCY (MHz) MEASURED ANGILENT 4287 16197 2000 3000
Document Number: 10134 Revision: 12-Oct-04
technical questions, contact: siliconRFcap@vishay.com
Capacitance Selection Guide Cross Reference
Silicon Chip Capacitors
When designer using directly, value tolerance required desired operating frequency conversion will yield effective capacitance part number. When designer wants show multiple sources Bill Materials (BOM) simply includes appropriate part number each technology. example:
ITEM C115 MANUFACTURER VISHAY MANUFACTURERS PART NUMBER HPC0402A160FXYT 0402J100FBWTR
capacitor demonstrates stable capacitance value just (Figure take advantage flatter curve silicon capacitor, circuit designer must capacitor applications that normally would require LTCC capacitor. Because characteristic curves LTCC technologies rise quickly higher frequencies, value that would intersect these curves would different depending upon frequency interest. conversion guide, online download, been created direct identification correct capacitance replace LTCC capacitance values GHz. guide available identify value part number that would replace LTCC technologies particular application, designer must insert capacitance value used other technologies, along with operating frequency into conversion program. program then identifies direct replacement those capacitors. Suppose, example, designer been using AVX's Accu-P 0402 series capacitor specified used working frequency 2600 MHz. Insertion this data into conversion guide will show that Accu-P nominal 10-pF capacitor effective capacitance 19.752 2600 MHz. also shows that capacitance 19.752 nominal 16-pF capacitor. designers' convenience, conversion program provides complete part number (HPC0402A160FXYT) Vishay capacitor suitable this application. this conversion program eliminates need user S-parameters through simulation programs same results.
Note that each item show different values different technologies same application. There other take advantage superior stability precision capacitor while still holding positions competing products. Note: technical paper describing these effects greater detail titled: "0.1 0402 Capacitor Capacitance Stability From several GHz." available www.vishay.com
www.vishay.com
technical questions, contact: siliconRFcap@vishay.com
Document Number: 10134 Revision: 12-Oct-04

Silicon Chip Capacitors CAPACITANCE FREQUENCY SELECTION GUIDE CRO

Top Searches for this datasheet

Other recent searches