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LDMOS (laterally-diffused metal-oxide semiconductor)[1] is a planar double-diffused MOSFET (metal–oxide–semiconductor field-effect transistor) used in amplifiers, including microwave power amplifiers, RF power amplifiers and audio power amplifiers. These transistors are often fabricated on p/p+ silicon epitaxial layers. The fabrication of LDMOS devices mostly involves various ion-implantation and subsequent annealing cycles.[1] As an example, the drift region of this power MOSFET is fabricated using up to three ion implantation sequences in order to achieve the appropriate doping profile needed to withstand high electric fields.
The silicon-based RF LDMOS (radio-frequency LDMOS) is the most widely used RF power amplifier in mobile networks,[2][3][4] enabling the majority of the world's cellular voice and data traffic.[5] LDMOS devices are widely used in RF power amplifiers for base-stations as the requirement is for high output power with a corresponding drain to source breakdown voltage usually above 60 volts.[6] Compared to other devices such as GaAs FETs they show a lower maximum power gain frequency.
Manufacturers of LDMOS devices and foundries offering LDMOS technologies include, Tower Semiconductor, TSMC, LFoundry, SAMSUNG, GLOBALFOUNDRIES, Vanguard International Semiconductor Corporation, STMicroelectronics, Infineon Technologies, RFMD, NXP Semiconductors (including former Freescale Semiconductor), SMIC, MK Semiconductors, Polyfet and Ampleon.
Photo gallery
[edit]Various RF LDMOS transistors
-
BLF2045 silicon die. RF LDMOS 26 V 180 mA 2 GHz 10 dB 30 W SOT467C. Designed for broadband operation (1800 to 2200 MHz). -
BLF861A RF LDMOS transistor. RF LDMOS transistor 860 MHz 150 W. -
BLF861A silicon die. RF LDMOS transistor 860 MHz 150 W. Designed for UHF operation.
Applications
[edit]Common applications of LDMOS technology include the following.
- Amplifiers — RF power amplifiers,[2][3] audio power amplifiers,[7] class AB[4]
- Audio technology — loudspeakers, high-fidelity (hi-fi) equipment, public announcement (PA) systems[7]
- Mobile devices — mobile phones[3]
- Pulse applications[4]
- Radio-frequency (RF) technology — RF engineering (RF engineering), RF power amplifiers[2][3][8]
- Wireless technology — wireless networks and digital networks[2][3]
RF LDMOS
[edit]Common applications of RF LDMOS technology include the following.
- Aerospace and defense technology[5] — military applications[9]
- Alarm and security — security alarm[14]
- Avionics[15][10] — ADS-B transponders, identification friend or foe (IFF) transponders, secondary surveillance radar (SSR), distance measuring equipment (DME), Mode S edge-localized mode (ELM), tactical data link (TDL),[10] airband[16]
- Consumer electronics[14]
- Data logging[17]
- Equipment condition monitoring (CM)[17]
- Fire detection[17]
- Gas detection — carbon monoxide detector (CO detector), methane detection[17]
- Industrial, Scientific and Medical band (ISM band) applications[15][4] — particle accelerators,[18][19] welding,[19] continuous wave (CW) applications, linear applications,[20] pulse applications[10][9][20]
- Laser technology — laser drivers,[18] carbon dioxide laser (CO2 laser)[21]
- Radio technology — commercial radio, public safety radio, marine radio,[13] amateur radio,[21] portable radio,[17] wideband,[22] narrowband[23]
- Millimeter-wave (mmW) technology[24]
- Mobile radio[15][25] — professional mobile radio, handheld transistor radio, analog radio, digital radio,[25] digital mobile radio (DMR),[26] land mobile radio system (LMRS),[16] private mobile radio (PMR),[17] Terrestrial Trunked Radio (TETRA)[25][19]
- Radar technology[15][4] — L band,[11][9] S band[11][23]
- Radio-frequency (RF) technology — radio-frequency identification (RFID)[13] RF plasma generator[18]
- RF energy technology[27][5][28] — lighting, medical technology, drying, automotive electronics[28]
- Heating — electric heating,[21] RF heating,[18][5] microwave heating[28]
- Kitchen appliances — smart appliances,[5] countertop appliances, cooking appliances,[29] RF cooking,[27][18][5] microwave cooking,[4] RF defrosting,[18][5][29] frozen food defrosting, freezers, refrigerators, ovens[29]
- Smart lighting — RF lighting and wireless light switch[4]
- Telecommunications[15]
- Broadband[14] — mobile broadband[25]
- Broadcasting — ultra high frequency (UHF) broadcasting,[14] FM broadcasting[18][4][21]
- Cellular networks[30][5] — 2G, 3G,[2] International Mobile Telecommunications-2000 (IMT),[22] Long-Term Evolution (LTE),[31] 4G,[3][5] 5G,[3][5][31] 5G New Radio (5G NR)[32][33]
- High frequency (HF) communication — very high frequency (VHF),[18][4] ultra high frequency (UHF)[13][4]
- Cellular voice and data traffic[5]
- Television (TV)[18] — VHF TV,[21] UHF TV, digital TV (DTV), TV transmitter equipment[14]
- Wideband and mobile communications[13] — base stations,[13][4][19] emergency position-indicating radiobeacon station (EPIRB), sonar buoys, automatic meter reading (AMR)[13]
- Wireless technology — mobile communication, satellite communication,[15] wireless data modems,[13] WiMAX[4]
- Voltage standing wave ratio (VSWR) applications[34][21] — plasma etching and synchrotrons[21]
See also
[edit]References
[edit]- ^ a b A. Elhami Khorasani, IEEE Electron Dev. Lett., vol. 35, pp. 1079-1081, 2014
- ^ a b c d e Baliga, Bantval Jayant (2005). Silicon RF Power MOSFETS. World Scientific. pp. 1–2. ISBN 9789812561213.
- ^ a b c d e f g h Asif, Saad (2018). 5G Mobile Communications: Concepts and Technologies. CRC Press. p. 134. ISBN 9780429881343.
- ^ a b c d e f g h i j k l Theeuwen, S. J. C. H.; Qureshi, J. H. (June 2012). "LDMOS Technology for RF Power Amplifiers" (PDF). IEEE Transactions on Microwave Theory and Techniques. 60 (6): 1755–1763. Bibcode:2012ITMTT..60.1755T. doi:10.1109/TMTT.2012.2193141. ISSN 1557-9670. S2CID 7695809.
- ^ a b c d e f g h i j k "LDMOS Products and Solutions". NXP Semiconductors. Retrieved 4 December 2019.
- ^ van Rijs, F. (2008). "Status and trends of silicon LDMOS base station PA technologies to go beyond 2.5 GHz applications". Radio and Wireless Symposium, 2008 IEEE. Orlando, FL. pp. 69–72. doi:10.1109/RWS.2008.4463430.
- ^ a b Duncan, Ben (1996). High Performance Audio Power Amplifiers. Elsevier. pp. 177-8, 406. ISBN 9780080508047.
- ^ "A 600W broadband HF amplifier using affordable LDMOS devices". QRPblog. 2025-08-05. Retrieved 2025-08-05.
- ^ a b c "L-Band Radar". NXP Semiconductors. Retrieved 9 December 2019.
- ^ a b c d "Avionics". NXP Semiconductors. Retrieved 9 December 2019.
- ^ a b c "RF Aerospace and Defense". NXP Semiconductors. Retrieved 7 December 2019.
- ^ a b "Communications and Electronic Warfare". NXP Semiconductors. Retrieved 9 December 2019.
- ^ a b c d e f g h "Mobile & Wideband Comms". ST Microelectronics. Retrieved 4 December 2019.
- ^ a b c d e f "470–860 MHz – UHF Broadcast". NXP Semiconductors. Retrieved 12 December 2019.
- ^ a b c d e f "RF LDMOS Transistors". ST Microelectronics. Retrieved 2 December 2019.
- ^ a b "28/32V LDMOS: IDDE technology boost efficiency & robustness" (PDF). ST Microelectronics. Retrieved 23 December 2019.
- ^ a b c d e f "AN2048: Application note – PD54008L-E: 8 W – 7 V LDMOS in PowerFLAT packages for wireless meter reading applications" (PDF). ST Microelectronics. Retrieved 23 December 2019.
- ^ a b c d e f g h i j k "ISM & Broadcast". ST Microelectronics. Retrieved 3 December 2019.
- ^ a b c d "700–1300 MHz – ISM". NXP Semiconductors. Retrieved 12 December 2019.
- ^ a b "2450 MHz – ISM". NXP Semiconductors. Retrieved 12 December 2019.
- ^ a b c d e f g h "1–600 MHz – Broadcast and ISM". NXP Semiconductors. Retrieved 12 December 2019.
- ^ a b "28/32 V LDMOS: New IDCH technology boosts RF power performance up to 4 GHz" (PDF). ST Microelectronics. Retrieved 23 December 2019.
- ^ a b "S-Band Radar". NXP Semiconductors. Retrieved 9 December 2019.
- ^ "RF Cellular Infrastructure". NXP Semiconductors. Retrieved 7 December 2019.
- ^ a b c d "RF Mobile Radio". NXP Semiconductors. Retrieved 9 December 2019.
- ^ "UM0890: User manual – 2-stage RF power amplifier with LPF based on the PD85006L-E and STAP85050 RF power transistors" (PDF). ST Microelectronics. Retrieved 23 December 2019.
- ^ a b "915 MHz RF Cooking". NXP Semiconductors. Retrieved 7 December 2019.
- ^ a b c Torres, Victor (21 June 2018). "Why LDMOS is the best technology for RF energy". Microwave Engineering Europe. Ampleon. Archived from the original on 10 December 2019. Retrieved 10 December 2019.
- ^ a b c "RF Defrosting". NXP Semiconductors. Retrieved 12 December 2019.
- ^ "White Paper – 50V RF LDMOS: An ideal RF power technology for ISM, broadcast and commercial aerospace applications" (PDF). NXP Semiconductors. Freescale Semiconductor. September 2011. Retrieved 4 December 2019.
- ^ a b "RF Cellular Infrastructure". NXP Semiconductors. Retrieved 12 December 2019.
- ^ "450–1000 MHz". NXP Semiconductors. Retrieved 12 December 2019.
- ^ "3400–4100 MHz". NXP Semiconductors. Retrieved 12 December 2019.
- ^ "HF, VHF and UHF Radar". NXP Semiconductors. Retrieved 7 December 2019.