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**The High Voltage/High Power FET (HiVP)**

Amin K. Ezzeddine & Ho C. Huang Amcom Communications, Inc. Clarksburg, Maryland, USA

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**Presentation Outline Why high voltage device?**

Traditional high voltage approaches New High Voltage/ High Power (HiVP) configuration Implementation of a 14V & 28V GaAs MMIC HiVP Conclusion

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**Why High Voltage Device?**

Some applications need high voltage: Phase arrays Satellite transmitters No DC-to-DC converter Low breakdown voltage in semiconductors materials such as: GaAs, AlGaAs, InP. High power

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**FET High Voltage Configurations**

Traditional high voltage device configurations: DC series/ RF parallel DC series/ multi-stage New High Voltage/high Power device (HiVP)

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**DC Series/RF Parallel Configuration**

INPUT MATCHING OUTPUT Power Divider Power Combiner Vgg Vds 2Vds 3Vds Vdd = 4Vds RF IN RF OUT Choke Bypass

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**DC-Series/Cascaded-Stages Configuration**

OUTPUT MATCHING INPUT MATCING Vds 2Vds INTERSTAGE Vgs RF in Choke Bypass RF out

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**New High Voltage/ High Power (HiVP)**

Equivalent performance to a single device: - Efficiency - Power Higher gain High voltage bias Scaled I-V characteristics Power combiner

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**4-Cell High Voltage/ High Power (HiVP)**

OUTPUT MATCHING INPUT Vgs Vd3=3Vds Vdd = 4Vds RF IN RF OUT Vd2=2Vds Vd1=Vds FET1 (W/4) FET2 (W/4) FET3 (W/4) FET4 (W/4) C1 C2 C3 R4 R3 R2 R1 Vg4=3Vds+ Vgs Vg3=2Vds+ Vgs Vg2=Vds+ Vgs Vg1=Vgs

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**I-V Characteristics of a 4-Cell (4 x 3mm) HiVP Device**

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**4-Cells HiVP Voltage Waveforms**

Vin Vd3=3Vm Vdd = 4Vm Vd2=2Vm Vd1=Vm C1 C2 C3 R4 R3 R2 R1 Zopt

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**Impedance Optimization of Common Gate FET**

Drain Source CN+1 Gate CN Zsource, N Zopt, N = Z source, N+1 (N+1)th FET Nth Zopt, N+1 Z source, N 1/gm (Cgs+ C N) / CN gm is FET transconductance Cgs is FET gate-to-source capacitance

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**HiVP Configuration Features**

High voltage bias: Vdd = Vds x N Lower Current by 1/N factor compared to regular FET with equivalent periphery Higher optimum output impedance by N2 factor Higher input impedance Higher gain by factor of N Broadband matching Simple & compact configuration Concept applicable to LDMOS and MOSFET to achieve very high power

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**Power & IP3 for 14V Hybrid HiVP at 1GHz**

P1dB =35dBm Efficiency = 25% IP3 = 45dBm @ 1.0GHz

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**14V/2-Cells HiVP MMIC ( 2 x 2mm device)**

S-Parameters Chip Layout P1dB =31dBm Efficiency = 35% IP3 = 46dBm @ 3.5GHz

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**Pout & Efficiency of 2 x 2mm HiVP at 3.5GHz**

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IP3 & IP5 of 2 x 2mm HiVP at 3.5GHz

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**28V/4-Cells HiVP MMIC (4 x 1mm device)**

S-Parameters Chip Layout P1dB =31dBm Efficiency = 32% IP3 = 45dBm @ 1GHz

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**28V/4-Cells HiVP in Parallel (4 x 3mm device)**

4 x 3mm Chip Package Device P1dB =35dBm Efficiency = 27% IP3 = 50dBm @ 2.15GHz

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**Power & Efficiency of 4 x 3mm HiVP at 2.15GHz**

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IP3 of a 4 x 3mm HiVP at 2.15GHz

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**IP3 at 2.15GHz for 4 x 3mm HiVP versus 12 mm FET**

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**24V/4-Cell High Power pHemt HiVP (4 x24mm)**

4 x 24mm Chip P1dB =43dBm Efficiency = 30% IP3 = 57dBm @ 1.5GHz 4 x 6mm Chip

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**Power & Efficiency of 4 x 24mm pHemt HiVP at 1.5GHz**

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**IP3 of 4 x 24mm pHEMT HiVP at 1.5GHz**

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Conclusion A simple DC series/RF series device (HiVP) for high voltage operation is presented This simple new device behaves as an RF combiner New device has good linearity and broadband performance HiVP concept could be applied to GaN and Silicon FETs to push the power to kW ranges

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