GaN MMIC PAs for MMW Applicaitons
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1 GaN MMIC PAs for MMW Applicaitons Miroslav Micovic HRL Laboratories LLC, 311 Malibu Canyon Road, Malibu, CA 9265, U. S. A.
2 Motivation for High Frequency Power sources 6 GHz 11 GHz Frequency Spectrum High Data Rate Wireless Links (1 Gbits/s) Commercial Bands (E-band radio) 71 GHz 76 GHz, 81 GHz 86 GHz, 92 GHz 95 GHz Inter-Satellite 59.3 GHz 64 GHz Active Millimeter-Wave Imaging 94 GHz SAR, Phase Array Radar (Space based W-band radar for earth studies.) RF Sources for THz Multiplier Diodes Fundamental Power for THz Space Array Spectroscopy Power Required Watts Available Sources < 2 mw GaN MMIC 3 W at 95 GHz
3 Microwave and Millimeter-wave Solid State Sources 1 Pulsed mode Estimated CW GaN limit 1 Pout [W] 1 Estimated CW LDMOS limit Estimated CW GaAs limit HRL GaN 28 1 Symbols: LDMOS catalog items GaAs catalog items GaN reported data HRL GaN 26 HRL GaN Frequency [GHz] Output power per single die.
4 HRL W-band GaN Roadmap Output Power (mw) 3,5 3, 2,5 2, 1,5 1, HRL HRL IEDM IEDM paper paper HRL HRL IR&D IR&D Q3 Q Plan Plan Gate Width (mm) Extrapolate >3 >3 W! W! Q4 Q Plan Plan Best Best GaAs GaAs phemt phemt and and InP InP HEMT HEMT Disruptive W-band W GaN Power MMICs 8X higher power density than mmw GaAs phemt
5 Cost trade-off estimate for 3 Watt W-band SSPA GaAs phemt SSPA GaN SSPA 8-way waveguide combining Number of WR-1 power modules Number of MMIC s per module 8-way splitter and 8 way combiner required 8 3 (Attenuator, Phase Shifter, Power Amplifier) Power combining not required 1 1 (Power Amplifier only) Hand-tuning to obtain phase and amplitude match for combining Combiner arms tuned manually No tuning 3 Watt GHz GaN SSPA is is Cost Effective
6 W-band GaN MMIC Device Passivation Source Ohmic n + GaN AlGaN Schottky barrier GaN T-gate device AlGaN buffer SiC substrate Gate Lg =.12 µm Drain Ohmic n + GaN N+ layer facilitates fabrication of ohmic contacts. Double Heterojunction Structure Low ohmic contact resistance <.2 Ω/mm. Comparable to GaAs phemt s and InP HEMT s. Smooth ohmic metal edges. Recessed gate Bi-layer e-beam gate litho Lg =.12 µm for Ka-band SiN passivation and capacitor dielectric 2 µm Source-Drain separation TaN 5 Ω/Square resistor Epi resistors
7 Short Channel Effects - Buffer Isolation Electrostatic Potential [ev] Ec Ef Ev Conventional HEMT Al.26 Ga.74 N SHFET GaN Position [Angstroms] Electron Concentration [cm -3 ] Electrostatic Potential [ev] Ec Ef Al.3 Ga.7 N Ev DHFET GaN Al.4 Ga.96 N Position [Angstroms] Techniques used to improve backside confinement and buffer isolation Doping Fe doped buffer layer; Y.-F. Wu et al., El. Dev. Lett., Vol. 25, pp C doped buffer layer; S. Rajan et al., El. Dev. Lett., Vol. 25, pp Polarization Engineering GaN DHFET structure; M. Micovic et al., IEDM 24 Digest, pp InGaN back barrier; T. Palacios et al., El. Dev. Lett., Vol. 27, pp Electron Concentration [cm -3 ]
8 Short Channel Effects - Buffer Isolation 1 Transfer curves of GaN DHFET (blue) and SHFET (red); Both wafers have field plate gate structure; Vds=1V Transfer curves of Lg =.12 µm GaN HEMTs Conventional (Red), DHFET (Blue) 1 Ids [ma/mm] >1x Leakage Reduction Vds=1V Ids DHFET Idss SHFET Vg [V] DHFET Structure: -Improved Back-Channel Confinement, -Reduced sub-threshold drain leakage current.
9 Uniformity Better than 1% over 3 Wafer Epi Thickness.9 % AlGaN %.68 % Sheet resistance.46 % Uniformity = Std. Dev. / Mean No edge exclusion
10 Individual Source Vias 3x3 vertical wall vias in 5 µm substrate Enables microstrip MMICs Low source inductance < 1 ph Critical for high power W-band power amp performance
11 DC Device Characteristics L g =.1 µm, W g = 4 x 37.5 µm GaN HFET Id [ma] 14 Vgs = to -4 V Vgs = 12 Step = -.5 V -.5 V 1-1. V V 6-2. V V 2-3. V Vds [V] Id ss = 9 ma/mm Ids [ma/mm] Ids gm Vgs [V] g m of 36 ms/ mm at V ds = 12 V gm [ms/mm]
12 Small Signal RF Performance MSG H21 f T = 9 GHz f max = 2 GHz Gain [db] Frequency [GHz] L g =.1 µm, W g = 4 x 37.5 µm GaN HFET V ds = 1 V, I ds = 45 ma.
13 5 mw 7 GHz GaN MMIC PA 7 GHz MMIC Chip Layout Size 3.4 mm x 1.3 mm Operating Voltage = 15 V Measured Gain > 15 db Small Signal Gain, Return Loss [db] GHz Bandwidth, Gain > 15 db, Gain Ripple <.5 db Measured frequency response of 7 GHz GaN PA 7.4 GHz db 71.2 GHz db GHz db 82.3 GHz db Frequency (GHz) Measured small signal gain of 7 GHz 5 mw GaN MMIC PA. Performance meets design goal.
14 Output power of 7 GHz MMIC measured at a frequency of 76 GHz Pout (dbm), Gain (db), PAE (%) Pout (dbm) Gain (db) PAE (%) Pin (dbm) P sat = 5 mw PAE = 17% P 1dB = 24 dbm Vds = 15 V
15 Comparison of 7 GHZ MMIC Performance with the best commercial phemt Parameter Gain 7 GHz GaN MMIC PA >14 db Commercial GaAs phemt > 5 db P 1dB 24 dbm 2 dbm Psat 27 dbm 22 dbm PAE Input return loss Output return loss 16.5 % < -8 db < - 8 db < -4 db < -2 db The The most powerful MMIC reported to to date at at 7 7 GHz
16 5 mw 8 GHz GaN MMIC PA 2 15 GHz Bandwidth, Gain > 11 db Measured frequency response of 8 GHz GaN PA 8 GHz MMIC Chip Layout Size 3.4 mm x 1.3 mm Operating Voltage = 15 V Measured Gain > 11 db Small Signal Gain, Return Loss [db] GHz db GHz 14.5 db GHz 12.7 db Frequency (GHz) Measured small signal gain of 8 GHz 5 mw GaN MMIC PA. MMIC Designed for for E-band E Radio Band
17 Output power of 8 GHz MMIC measured at a frequency of 83 GHz Pout, Gain, PAE [dbm, db, %] Pout Gain PAE 27 dbm 17 % 12 db P sat = 5 mw PAE = 17% P 1dB = 24 dbm Vds = 15 V Power modules using 26 GaN SR parts used as a power source. Pin [dbm] Highest Output Power and and Efficiency reported for for a solid state source at at this this frequency.
18 Comparison of 8 GHZ MMIC Performance with the best commercial phemt Parameter Gain 8 GHz GaN MMIC PA >11 db Commercial GaAs phemt > 5 db P 1dB 24 dbm 2 dbm Psat 27 dbm 22 dbm PAE Input return loss Output return loss 17 % < -7 db < - 7dB < -4 db < -2 db The The most powerful MMIC reported to to date at at 8 8 GHz
19 5 mw 9 GHz GaN MMIC PA Flat Response over 92 GHz- 95 GHz frequency band. 9 GHz Measured Bandwidth, frequency Return response Loss of 95 GHz < -1 GaN dbpa 2 9 GHz MMIC Chip Layout Size 2.4 mm x 1.3 mm Operating Voltage = 15 V Measured Gain > 15 db Small Signal Gain, Return Loss [db] GHz db GHz db GHz db Frequency (GHz) Measured small signal gain of 9 GHz 5 mw GaN MMIC PA. Performance Meets Design Goals
20 Output Power of 9 GHz GaN MMIC measured at a frequency of GHz Pout, Gain, PAE [dbm, db, %] P o u t [d B m ] G a in [d B ] PAE [% ] P.5dB = 23 dbm Linear Gain = 14.4 db 23 db m 13.8 db 9 % Pin [dbm ] Output power limited by available input drive, circuit less than.5 db compressed. HRL is building a power source using GaN MMIC to test the power.
21 Comparison of 9 GHZ MMIC Performance with best commercial GaAs phemt Parameter Gain HRL 9 GHz GaN MMIC PA >14 db GaAs phemt > 1 db Gain Ripple <.5 db < 1 db P 1dB >23 dbm 2 dbm Psat To be measured 23 dbm PAE Input return loss Output return loss To be measured < -1 db < - 1dB < -8 db < -8 db
22 25 mw 1 GHz GaN MMIC PA 2 Measured frequency response of 1 GHz GaN PA 1 GHz MMIC Chip Layout Size 2.4 mm x 1.3 mm Operating Voltage = 15 V Measured Gain > 15 db Small Signal Gain, Return Loss [db] GHz db 1.3 GHz db GHz db Frequency (GHz) Measured performance of the first 1 GHz GaN MMIC chip. Fastest GaN MMIC Circuit Near Term Potential for for GHz GHz
23 Summary GaN MMIC technology will dominate high frequency > 5 GHz solid state RF power technology. Key challenges for MMW GaN: Ohmic Contacts Short gate lengths Device Structure GaN MMICs exceeding power of best GaAs and InP MMICs at 95 GHz demonstrated. GaN MMICs with 5 x power of the best InP MMICs are on the road map for 29. MMW GaN MMIC technology enables new systems, applications and services.
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