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Kemet Webinar - Taking the mystery out of RF ceramics capacitors
1.
Taking the Mystery
Out of RF Ceramics Capacitors
2.
2© KEMET Electronics.
All Rights Reserved. Outline What is RF? Capacitor Basics RF Capacitors Properties and Characterization KEMET CBR Series
3.
3© KEMET Electronics.
All Rights Reserved. RF Overview • Low MHz to 300GHz. • Higher frequency ranges allow for: • More use of the frequency spectrum • Efficiency in propagating signals from one point to another • Reduction in size of components such as antennas. • Markets • Telecom • Medical • IoT • Autonomous Driving • Military, Space and Aeronautics, etc
4.
4© KEMET Electronics.
All Rights Reserved. What is RF? Capacitor Applications Bypass DC BLOCKING MATCHING BYPASS
5.
5© KEMET Electronics.
All Rights Reserved. Capacitor Basics A Refresher
6.
6© KEMET Electronics.
All Rights Reserved. Capacitor Basics C = Design Capacitance K = Dielectric Constant A = Overlap Area d = Ceramic Thickness n = Number of Electrodes C = e0KA(n-1) d Detailed Cross Section Inner Electrode End Termination Barrier Layer Termination Finish Dielectric Material
7.
7© KEMET Electronics.
All Rights Reserved. Capacitor Basics The Ideal Capacitor Ideal Capacitor • Pure Capacitance • No resistance (ESR) • No Inductance (ESL) Z=Capacitive Impedance or Reactance Ideal Model 10pF example
8.
8© KEMET Electronics.
All Rights Reserved. Capacitor Basics Real Capacitor Real Capacitor • C - Nominal capacitance • ESR - Series resistance (terminations, dielectric, and electrodes) • ESL - Series inductance Simplified Real Model 10pF example SRF C ESR ESL
9.
9© KEMET Electronics.
All Rights Reserved. Capacitor Basics Closer Look at ESR RF Frequencies
10.
10© KEMET Electronics.
All Rights Reserved. RF Capacitors What’s the Difference? “Regular” Capacitor RF Capacitor
11.
11© KEMET Electronics.
All Rights Reserved. RF Capacitor Basics Some Key Parameters C0G → ppm/ oC level X7R → % level Effective Series ResistanceESR The resistance of the capacitor which includes resistance due to the dielectric as well as electrodes. Quality FactorQ Quantifies the amount of energy stored versus how much is dissipated as heat. It represents the efficiency of the capacitors. Higher Q’s are needed for RF capacitors to limit power dissipation. Series Resonant FrequencySRF Shows where the total impedance is no longer capacitive and begins an upward trend (becomes inductive). Higher SRF = better RF capacitor, since some applications require the designer to stay well below the SRF. Temperature Coefficient of CapacitanceTCC Determines how much the capacitance values will shift at different temperatures. RF capacitors need to be very stable over a broad temperature range. 𝑸 = 𝑿𝒄 𝑬𝑺𝑹 = 𝟏 𝑫𝑭 𝑺𝑹𝑭 = 𝟏 𝟐 ∗ 𝝅 ∗ 𝑪 ∗ 𝑳
12.
12© KEMET Electronics.
All Rights Reserved. So, What is an RF Capacitors An RF capacitor is a capacitor whose “characteristics” are favorable at RF frequencies So, for RF capacitors, materials are chosen and the design is optimized so that the capacitors’ characteristics are well suited at the higher frequencies. Characteristic RF Capacitor Requirements ESR (Effective Series Resistance) RF Capacitors are designed to have the lowest possible ESR. This allows for minimal power loss at RF frequencies. Q (Quality Factor) RF Capacitors are designed to have a high Q. SRF (Series Resonant Frequencies) RF Capacitors are designed to have high SRF allowing for a higher operating frequency range. TCC (Temperature Coefficient of Capacitance) Dielectric chosen to have minimal capacitance shift across entire operating temperature range.
13.
13© KEMET Electronics.
All Rights Reserved. Optimizing for RF Design Design Goal How? Dielectric • Low Loss • Temperature and Voltage Stability High Q class 1 dielectrics such as C0G or NPO Electrodes • Low Loss • Low Inductance Non-ferrous electrode materials Construction / Physical Geometry • Low Loss • Low Inductance Consider square case size Long/Narrow vs Short/Wide 0 5 10 15 20 25 30 0.1 1 10 100 1000 10000 RESISTANCE(OHMS) FREQUENCY(MHZ) Resistance of 100mm Wire Diameter = 1.5mm Resistance Copper (Ohms) Resistance Nickel (Ohms)
14.
14© KEMET Electronics.
All Rights Reserved. RF Capacitors Why Copper BME 0 5 10 15 20 25 30 35 40 150 300 600 1200 PowerDissipationmW Frequency Power Dissipation vs. Frequency Ni BME Cu BME Copper BME = Lower ESR = Better power dissipation = Ideal for High Frequency applications Ag-PME Pd-PME Ni-BME Cu-BME 0 3 6 9 12 15 ElectricalResistanceΩ-cm Electrode Material Electrical Resistance
15.
15© KEMET Electronics.
All Rights Reserved. RF Capacitor Properties and Characterization
16.
16© KEMET Electronics.
All Rights Reserved. ESR and Q
17.
17© KEMET Electronics.
All Rights Reserved. Low Frequency Design vs RF Design Impedance / ESR Approach S-Parameter Network Approach S11 S21 S22 S12 Z a1 b1 a2 b2
18.
18© KEMET Electronics.
All Rights Reserved. S-Parameters Incident Wave a1 Transmission b2 Lens S11= b1/ a1 S21= b2/ a1
19.
19© KEMET Electronics.
All Rights Reserved. S-Parameters Looks like an impedance curve S11 S21 Reflected Transmitted
20.
20© KEMET Electronics.
All Rights Reserved. S-Parameters How Designers Use Them? • RF designers use simulation tools to run analysis on circuits similar to P-Spice. • Keysight’s Advanced Design Systems (ADS) • Keysight’s Eagleware Genesys • AWR’s Microwave Office Schematic of circuit to simulate S- Parameter file in Eagleware Genesys
21.
21© KEMET Electronics.
All Rights Reserved. What about the substrate? High Frequency (RF Capacitors) • Parasitic capacitances and ESL dependent on • Substrate properties • Height • Er • Loss Tangent • Metal Thickness • Pad Dimensions • Length • Width • Spacing
22.
22© KEMET Electronics.
All Rights Reserved. What about the substrate? SUBST=5mil FR4 PADG=0.6 mm PADL=1 mm PADW=1.45 mm Tolerance=1 Sim_mode=0 - Full Parasitic Model C=47 pF Part=KEMET CBR08 CAP_KMT_0805_107_4 Measurement Based Part Value Scalable Substrate Scalable Pad Scalable Modelithics Global ModelTM
23.
23© KEMET Electronics.
All Rights Reserved. What about the substrate? Poor Fit Excellent Fit
24.
24© KEMET Electronics.
All Rights Reserved. KEMET CBR Series
25.
25© KEMET Electronics.
All Rights Reserved. Ultra High Q-CBR Squared Series Offering Case Size Typical ESR (10pF @ 1 GHz) Dielectric Operating Frequency Range Operating Temperature Range Temp Coef. (TCC) Capacitance Range Max Voltage 0505 (NEW!) < 0.068 C0G 1MHz - 50GHz –55ºC to +125ºC 0 ±30 ppm/ºC 0.4pF - 100pF 250 High Q-CBR Series Offering (EIA Case Sizes) Case Size Typical ESR Ohms (10pF @ 1 GHz) Dielectric Operating Frequency Range Operating Temperature Range Temp Coef. (TCC) Capacitance Range Max Voltage 0201 - C0G 1MHz - 50GHz –55ºC to +125ºC 0 ±30 ppm/ºC (0 ±60 ppm/ºC for 0201 case size ≥ 22 pF) 0.1pF - 33pF 50 0402 < 0.095 0.1pF - 100pF 200 0603 < 0.100 0.3pF - 100pF 250 0805 < 0.085 0.3pF - 100pF 500 KEMET CBR Series Copper Electrodes
26.
26© KEMET Electronics.
All Rights Reserved. Summary • RF adoptions continues to grow • RF capacitors are designed and optimized to operate at higher frequencies • High frequencies bring unique design challenges • Design tools are readily available
27.
27© KEMET Electronics.
All Rights Reserved. Thank You!!! Mark R. Laps Technical Product Manager Ceramic Business Unit KEMET Electronics Cell Phone: +1-864-399-4879 Office Phone: +1-864-963-6383 www.kemet.com | marklaps@kemet.com
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