Related by context. All words. (Click for frequent words.) 73 #bit ADC 72 RF vector 71 local oscillator LO 70 customizable dataplane processor 70 resin transformers allow 70 differential signaling LVDS 70 controlled oscillators VCOs 69 RF LDMOS 69 analog baseband 69 AEL# 69 synchronous buck converter 69 stereo headphone amplifier 68 frequency synthesizer 68 #.# MHz [002] 68 AWL# 68 sigma delta 67 digitally programmable 67 VCXO 67 locked loop PLL 67 CMOS RF transceiver 67 TTL CMOS 67 frequency synthesizers 67 E pHEMT 67 customizable dataplane processors 67 TRF# [002] 67 transimpedance amplifier 67 frequency dividers 67 TxDAC 67 STA# [001] 67 #.#dBm typ. 67 GHz RF transceiver 67 HVIC 66 InGaP HBT 66 IF amplifier 66 ZMD# 66 transceiver IC 66 LVTTL 66 TMS#C#x + 66 Silicon Labs Si#xx 66 lock loop PLL 66 HMC#LP#E 66 quasi resonant 66 Analog Devices AD# 66 glueless interface 66 I2C serial interface 66 Infiniium oscilloscopes 66 downconverter 66 Frequency Hopping Spread 66 mixed-signal/RF technologies 66 baseband LSI 66 ADCs analog 66 absolute rotary encoders 65 circuit MMIC 65 iCoupler 65 converters ADC 65 SPI serial 65 delta sigma 65 P1dB 65 PWM controller 65 MOSFET drivers 65 Entropic EN# 65 PWM pulse width modulation 65 IEEE #.#.# compliant 65 SKY# #LF 65 pulse width modulation 65 synchronous buck controller 65 DEV DA TOMAR NEXT 65 #.#GHz RF transceiver 65 sigma delta ADC 65 serializer deserializer 65 PLL synthesizer 65 CEAG explosion proof 65 Laser VCSEL 65 #.#V/#.#V 65 frequency scaling DVFS 65 directional couplers 65 NVIDIA CUDA parallel 65 digital optocouplers 65 5Vdc 65 Peregrine UltraCMOS 65 #V dc [002] 65 CS# [002] 65 bit dsPIC 65 transmitters receivers 65 model A# 65 MPLAB REAL ICE 65 #.#V CMOS 65 RFIC simulation 65 Zarlink ZL# 65 Jinpan cast 65 UCD# 65 CS#L# 65 Stratix II FPGA 65 low dropout LDO 65 FlexPhase 65 ADRF# 65 mux demux 65 ARM9 core 65 I2C serial 65 XO VCXOs 65 ADC DAC 65 GaAs MESFET 65 isoPower 65 TDA# [001] 64 stereo codec 64 ARM#JF S 64 Talus Design 64 Serdes 64 PowerPro MG 64 Oxide Silicon 64 ARM Cortex M3 microcontroller 64 #/#Hz [001] 64 RFMD GaN 64 Axcelerator 64 PXI RF 64 EmberZNet 64 TVS Diodes 64 LMX# 64 Vdd 64 TMS#C# TM digital 64 3MHz 64 galvanically isolated 64 OmniPixel3 HS 64 Mixed Signal IC 64 MAX# integrates 64 debug characterization 64 MB#Q# 64 #.#um CMOS 64 VDSL2 modem 64 SAR ADC 64 CoolPAM 64 buck converter 64 performance amplifiers comparators 64 RocketIO TM 64 Potentiometers 64 extendible cores assist 64 ARM#EJ S TM 64 CX#X 64 TNETV# 64 BY JASON DELLA 64 Silicon Labs Si# 64 transistor pHEMT 64 ARM#T 64 synchronous buck regulator 64 bit sigma delta 64 PowerPAK 64 5V supply 64 PRoC LP 64 CPU emulation 64 Fusiv 64 PLL Synthesizer 64 TLV#AIC# 64 Signal Controllers DSCs 64 #VDC input 64 polar modulation 64 TVS diodes 64 analog converters DACs 64 Magma Quartz DRC 64 SPDT switch 64 -# dBc typical 64 switched capacitor 64 Freescale MC# 64 GaAs GaN 64 #Msps [002] 64 integrated circuits RFIC monolithic 64 ADF# 64 ARM#E S 64 EN# MPEG 4 64 MAX#A 64 Vitesse FlexEQ 64 operational amplifiers 64 user selectable bandwidths 64 GaAs FET 63 arbitrary waveform 63 TrueStore 63 silicon oscillators 63 ARM# processor [001] 63 GaAs pHEMT 63 using CMOS BiCMOS 63 SE#L 63 QAM quadrature amplitude modulation 63 cRIO 63 NASDAQ MXIM introduces 63 Adopts Cadence 63 ZL# [003] 63 PIN diodes 63 serializer deserializer SerDes 63 stereo CODEC 63 lowpass filter 63 Mosfet 63 metering ICs 63 RF amplifier 63 Our CONDIS R 63 PicoGuard 63 baseband MAC 63 Quiescent current 63 logarithmic amplifiers 63 AWT# AWT# 63 +# dBm output 63 Texas Instruments OMAP# 63 Follow Vishay 63 module VRM 63 Tx Rx 63 dB SNR 63 reconfigurable transceiver 63 Powerful debug 63 FPGAs ASICs 63 PLL Noise Analyzer 63 MPLAB PM3 universal 63 diplexer 63 synchronous rectification 63 Cirrus Logic CS# 63 quadrature modulators 63 Digital Converter ADC 63 nm CMOS process 63 #:# multiplexer 63 TNETW# 63 PowerBook G4 #mb SO 63 low capacitance ESD 63 #.#a/b/g-compliant MIMO enhanced 63 CS# EDC 63 MSC# [001] 63 timers counters PWMs 63 Industry Highest Density 63 MAX#/MAX# [002] 63 monolithic CMOS 63 coupled inductor 63 ColdFire V1 63 Arteris NoC solution 63 ARM#E 63 BCM# Bluetooth 63 analog converter DAC 63 Wolfson WM# 63 #.#V 5V 63 Rx Tx 63 MoSys Bandwidth Engine 63 ± #V [002] 63 trans impedance 63 Visit Addonics 63 Mach Zehnder modulator 63 VCXOs 63 oscillators filters 63 voltage divider 63 C#x + DSP 63 8kV 63 MSP# microcontroller 63 NXCPUs ™ 63 power MSP# microcontrollers 63 CompactPCI ® 63 #bit RISC 63 ADCs DACs 63 MI #XM 63 0dBm 63 EZRadio 63 manufactures integrated circuits 63 SoftMSC 63 integrated circuit MMIC 63 TGA# SM 63 Calculates optimum seek 63 PWM outputs 63 MaXcess ® unique 63 #ppm ° C 63 Z Foil 63 dsPIC R 63 expander switches 63 MICRF# 63 Avastar #W# 63 microwave integrated circuits 63 tunable filters 63 F#x [002] 63 piezoelectric transducer 63 PowerStar R 63 CC# RF transceiver 63 lamp ballasts 62 +#.# dBm [002] 62 LTC#/-# 62 Agilent #A [001] 62 Spectrum FHSS 62 directly modulated lasers 62 detectors frequency multipliers 62 silicon oscillator 62 #ksps 62 OPA# [002] 62 Industry Smallest 62 4kV 62 MBd 62 QDRII + 62 ± 5V 62 storage laser diode 62 MB#K# 62 ProASIC Plus 62 Virtuoso Multi 62 TMS#DM# [002] 62 MTCMOS 62 Clock Synthesizer 62 periodic analyzer 62 #MIPS [002] 62 GaAs MMIC 62 dc dc controller 62 1GB PC# 62 optically coupled 62 Actel Fusion 62 CMOS TTL 62 TI MSP# ultra 62 #.#μm CMOS 62 ASK FSK 62 2kHz 62 RF Power Amplifier 62 ADC#D# 62 3G DigRF 62 baseband IC 62 HD SDI SDI 62 RS# interfaces 62 arbitrary waveform generators 62 ADMP# 62 BCM# integrates 62 +7 dBm 62 dc dc conversion 62 rms jitter 62 ISL#A 62 Universal Asynchronous Receiver 62 ARM9 processor 62 microstrip 62 LTM# 62 modulators demodulators 62 Schottky Diode 62 #.#VDC 62 +8 dBm 62 Digital Signal Controllers 62 Broadcom Completes Acquisition 62 Le# [002] 62 switchmode 62 overvoltage protection OVP 62 #P# #P# #P# 62 Vector Signal Generator 62 HCMOS 62 SMARTMOS 62 converters modulators 62 I2C programmable 62 adaptive equalization 62 echo canceller 62 ADV# [001] 62 PWM output 62 Input Voltage 62 Switch Mode 62 digital isolators 62 impedance input 62 Agilent U#A 62 DirectFET R 62 #G DQPSK 62 RF ICs 62 IP SAS SATA 62 PMBus compliant 62 Our CONDIS ® 62 mA LDO 62 XLS Processors 62 OFDM orthogonal frequency 62 baseband analog 62 TMS#C# digital 62 LVCMOS 62 #.#V #.#V [002] 62 Noise Ratio 62 serdes 62 sampling oscilloscope 62 FPGAView 62 RS-#/# 62 On Insulator SOI 62 SY#L 62 QT# [001] 62 5mm x 5mm QFN 62 dc converter 62 REVOLUTIONARY NEW 62 division duplex FDD 62 Jetrion ® industrial 62 Debug Solution 62 LVDS LVPECL 62 instrumentation amplifier 62 ADN# 62 multi threaded multiprocessor 62 D Subminiature 62 Electronic Dispersion Compensation 62 amplifier ICs 62 monolithically integrated 62 pin BGA 62 BiFET 62 UCC# 62 ATmega#RFA# 62 Cadence Encounter digital 62 TLP# 62 MGA #P# 62 monolithic microwave integrated 62 amplifiers mixers 62 0 dBm 62 synchronous rectifier 62 analog circuitry 62 Nasdaq OPLK leading 62 GaAs PHEMT 62 TI TMS#DM#x 62 #G QSFP 62 DDR2 memory controller 62 4MHz 62 ARM# core [002] 62 #MS s [002] 62 RFMD RF# 62 diplexers 62 DSPLL 62 NanoSim 62 ratiometric 62 #K#R 62 continuous conduction 62 TigerSHARC 62 AFBR 62 wavelength multiplexing 62 I2C interfaces 62 picoArray 62 ARM7TDMI core 62 GPIB interface 62 GreenPoint reference 62 Bipolar CMOS DMOS BCD 62 servo controller 61 C BiCMOS 61 varactors 61 resin transformers 61 bootstrap diode 61 DIGIC III Image Processor 61 PIN photodiodes 61 AXI TM 61 MODBUS RTU 61 Agilent MXA 61 SOI CMOS 61 MSP#F#xx [001] 61 Stratix IV FPGA 61 LVPECL LVDS 61 #.#MHz switching frequency [002] 61 MMIC multi 61 TMS#C# ™ 61 Atmel picoPower 61 port #GBASE T 61 #μF [002] 61 IGBT Insulated Gate 61 ARM Cortex M4 61 MAX# [003] 61 Direct Sequence Spread 61 embOS 61 JESD#A 61 SiliconSmart 61 uncooled imaging 61 baseband RF 61 UART interface 61 inductive switching 61 LSI Logic logo 61 UNTERPREMSTAETTEN Austria Business Wire 61 Ethernet Serial ATA 61 Mbit SRAMs 61 Transition Minimized Differential Signaling 61 CSR BlueCore4 ROM 61 DisplayPort #.#a 61 components resistors inductors 61 #dB SNR [002] 61 Quick Path Interconnect 61 #.# micron CMOS 61 amplifier modules 61 SDI HDMI 61 MOSFETS 61 LMV# 61 ARM7TDMI S 61 SoC Encounter 61 precision op amps 61 LDMOS transistors 61 SRIO 61 PCIe GbE 61 Interphase iSPAN 61 DAN# 61 digital converters ADCs 61 RS# serial 61 J#A 61 crystal oscillator 61 ADSL VDSL 61 Low Noise Amplifier 61 Maxim MAX# 61 VI BRICK 61 1T Flash 61 audio CODEC 61 #.#.#/ZigBee 61 QT# [002] 61 mimoMAX 61 Linear ICs 61 IRS#D 61 TTL compatible 61 Frequency Synthesizer 61 #pF [002] 61 Switched Mode 61 jitter attenuation 61 Gbit LAN 61 #/#bit 61 #-bit/#MHz 61 MAX# MAX# [002] 61 SAR ADCs 61 RFCMOS 61 dsPIC#F GS series 61 LMP# [001] 61 #Hz #Hz [003] 61 dynamically reconfigurable 61 bit delta sigma 61 ARM#EJ S 61 multimode optical fiber 61 2hours #mins #.#secs M 61 FineSim Pro 61 PowerMacs G4 61 TRF# [001] 61 #.#MW D6 model 61 Input voltage 61 embedded SERDES 61 ON Semiconductor Expands 61 CAN #.#B 61 LSI TrueStore 61 #nm VCSEL [001] 61 PQFN package 61 ASICs FPGAs 61 Digital Converters 61 flyback converter 61 modules VRMs 61 VCO voltage controlled 61 Evaluation Module 61 highpass filter 61 pHEMT 61 PoE PD 61 EZRadioPRO 61 Xeon L# 61 ARM#J S 61 NeoMobileTV 61 Ultra DMA 61 triplexer 61 reset POR 61 1kV 61 #dBm output 61 XRT#L# 61 IQ modulator 61 waveform analyzer 61 #.#dB [003] 61 1Mbyte 61 insulator SOI technology 61 Structured eASIC 61 Si#x 61 IntelliMAX 61 Intel Core2 Duo processor 61 frame synchronizer 61 Phase Locked Loops 61 RS#/RS# 61 consumes #.#W 61 ZenTime 61 RF Transceiver 61 millimeter wave integrated circuits 61 dsPIC ® 61 visit www.analog.com 61 #:# LVDS 61 Flash MCU 61 HDMI DVI DisplayPort 61 Linear Technology LTC# 61 bipolar CMOS BiCMOS 61 IGBT gate 61 GDM# 61 Arria GX FPGAs 61 #K LEs 61 Reon VX 61 #ohm [001] 61 wavetable 61 Fiber Bragg Grating 61 servo amplifier 61 curve tracer 61 MEMS Sensor 61 Model #A 61 LMS# [001] 61 MSP# [002] 61 pulse width modulators 61 dsPIC#F# 61 Gigabit PHY 61 TMS#C# 61 #nm wavelength [002] 61 Actel FPGA 61 voltage differential 61 8PSK 61 Freescale Introduces 61 DQPSK 61 ZG#M 61 STMicroelectronics Introduces 61 NanoBridge 61 strain gage 61 wideband RF 61 ON Semiconductor Introduces 61 embedded microcontroller 61 PHY transceiver 61 VortiQa 61 SoundMAX 61 4Mbit 61 M#Kc 61 LVPECL 61 MAX#E 61 Si#xx 61 #Ω [002] 61 SIwave 61 ProSLIC 61 LTR# 61 TMS#TCI# 61 AD#x 61 #.#pF 61 #Msps [001] 61 Cypress CapSense ® 61 stepper drives 61 Encoder Decoder 61 MB DDR2 SDRAM 61 1T Flash ® 61 V dc 61 Altera Ships 61 Intel #L 61 #Mbps Powerline AV 61 LDO controller 61 MIMO WLAN 60 Ramjet Memory iMac G5 60 PWM controllers 60 AEC Q# qualified 60 pulse width modulation PWM 60 SPI I2C 60 domain optical coherence 60 digital converter ADC 60 uPD# [001] 60 mA output 60 PSoC Designer ™ 60 instrumentation amplifiers 60 locked loops PLLs 60 TI TMS#C# 60 Transmit Receive 60 Ramtron Announces 60 CAN transceivers 60 Cypress WirelessUSB 60 PXIe 60 TMS#C# DSP 60 signaling LVDS 60 AccelDSP 60 Watt MagSafe Power 60 dsPIC 60 AKU# 60 & Capacitive Proximity 60 PIN diode 60 I2C interface 60 PMBus interface 60 RF baseband 60 DS DBR 60 PCI Express Gen2 60 dBi gain 60 consumes #mW 60 dsPIC digital 60 AUIRS#S 60 baseband modem 60 ARM# [001] 60 Data Converters 60 #mb DIMM 60 Diamond Standard #HiFi 60 AVR MCU 60 GPIO interface 60 @ Tweaktown 60 supplies SMPS 60 #x# Multiple Input 60 #G XFP 60 Vector Signal Analyzer 60 #dBc 60 #V MOSFET [002] 60 correction PFC 60 DAC# 60 LatticeECP 60 #mA LDO 60 serial RapidIO 60 DMOS 60 PHY MAC 60 VUTEk ® superwide digital 60 IR# XPhase 60 TI TPS# 60 C#x DSP 60 anti aliasing filters 60 baseband chipset 60 mTouch capacitive touch 60 serialiser 60 Differential Quadrature Phase 60 capacitors inductors 60 voltage DSPs 60 ATmega# [002] 60 #/#/#Base-T 60 voltage #.#V 60 1Hz 60 Marvell #DE# 60 VUTEk ® superwide 60 Cortex M4 60 amplifiers EDFAs 60 ADI AD# 60 Fast Fourier Transform FFT 60 Virtex 5 60 #Vdc input 60 regulators LDOs 60 TX RX 60 ARM7TDMI processor 60 ISL#M 60 audio CODECs 60 TJA# 60 IEEE#.#b g 60 Bit MCU 60 Si# [001] 60 superwide digital inkjet printers 60 3U rack mount 60 laser diode drivers 60 MMA#L 60 ISL# [001] 60 #bit ADCs 60 MAX#/MAX# [001] 60 N#B [001] 60 #.#x#.#mm 60 Cadence Encounter 60 #/#Mbps Ethernet 60 Cortex R4 60 acoustic echo cancellation 60 Cadence Encounter RTL Compiler 60 RF demodulator 60 VR#.# 60 EP#S# 60 #.#b g WLAN 60 EZchip Semiconductor Nasdaq EZCH 60 STw# 60 RFX# 60 GHz chipsets 60 PCI Express PHY 60 JTAG port 60 GAO# [002] 60 universal asynchronous 60 Silicon TFPS 60 tunable optical 60 #dB SNR [001] 60 ADuM# 60 Blackmagic Design Announces 60 Agilent J BERT 60 #Tx/#Rx 60 Micrel Semiconductor 60 #MHz #MHz [002] 60 VGA LVDS 60 fully buffered DDR2 60 #nm CMOS [002] 60 MPC# processor 60 1T FLASH technologies 60 microwatt 60 ADXL# 60 XWAY ARX# 60 About Xilinx Xilinx 60 MCP#X 60 SiT# 60 Stratix II GX 60 deserializer 60 #.#Hz 60 SimpliciTI 60 picoPower 60 PIN photodiode 60 configurable analog 60 Talus Vortex 60 #.#af compliant 60 Agilent #B [001] 60 #Gbps serial 60 #MB DDR [002] 60 STLC# 60 NL# knowledge 60 TAS# [001] 60 nanometer CMOS process 60 DSP Builder 60 Application Specific Integrated Passive 60 module TWR 60 iT# 60 Freescale e# 60 MIM capacitors 60 IEPE 60 #.#kV [001] 60 EMI RFI filters 60 RF transceivers 60 4mm x 4mm QFN 60 #G DPSK 60 MIPS# #K 60 PHY Physical Layer 60 analog comparators 60 UWB WiMedia 60 Freescale QorIQ 60 #/#BaseT Ethernet 60 Protocol Stacks 60 #MHz #bit 60 ceramic resonators 60 CMOS oscillator 60 Intel #GME chipset 60 RF subsystem 60 #EM# 60 RedHawk SDL 60 GaAs HBT 60 C#x + 60 mTouch ™ 60 millimeter wave mmWave 60 OM3 fiber 60 Fractional N 60 Synopsys PrimeTime 60 XAUI PHY 60 TMS#C#x 60 μModule 60 AMD Geode LX #@#.#W 60 powerline modem 60 audio DACs 60 uW 60 RF SiP 60 DPSK 60 MOSFET gate 60 Power Integrations logo 60 5V CMOS 60 FULL IMPACT 60 coupling capacitors 60 IXYS Introduces 60 tif files under 60 stereo audio codec 60 CMOS imager 60 SFP + module 60 NaviLink 60 MAX# MAX# [001] 60 picoChip PC# [002] 60 TCI# 60 integrated VCOs 60 RF tuner 60 WLAN #.#n 60 S#C# 60 mosfet 60 resistor capacitor 60 CMOS compatible 60 GMSK 60 iMOTION 60 stripline 60 analog comparator 60 Silicon Oxide Nitride 60 Blackfin processor 60 VDDQ 60 Agilent Technologies Introduces 60 DSP# [001] 60 Vx# [002] 60 GreenChip TEA# 60 servo amplifiers 60 #Gbps optical [001] 60 OmniBSI TM 60 performance serial BERT 60 XMC module 60 SmartDoctor 60 Ethernet MACs 60 RF transceiver 60 4 x 4mm 60 FBAR filters 60 LES EXPLOSIFS NORDEX LTEE 60 Reflow Oven 60 High Dielectric Antenna 60 By JASON LAUGHLIN 60 tri acid digestion 60 Chipcon CC# 60 Inc. Ramaxel Technology 60 loopback mode 60 NXCPUs 60 quadrature modulator 60 Snapdragon MSM# 60 Digivance 60 multicore DSPs 60 LVDS interfaces 60 optocoupler 60 WirelessUSB LP 59 silicon photonic 59 #APSK 59 Group Ridin Chamillionaire 59 QRC Extraction 59 MPC#E processor 59 #DE# 59 Ethernet SONET 59 Freescale MSC# 59 DIN rail mounted 59 8kHz 59 pin 4mm x 59 arbitrary waveforms 59 PMICs 59 waveform generator 59 BCM# SoC 59 LVDS output 59 #Vrms 59 MZ modulator 59 Infrared IrDA 59 BY DANNY GALLAGHER 59 thermocouple RTD 59 +5 dBm 59 #dB SFDR 59 photodiode array 59 Laser Diode Driver 59 #Gb s QDR InfiniBand 59 Nasdaq VLTR 59 pseudomorphic 59 DVB-S/S2 59 integrated baseband processors 59 tuner ICs 59 Gallium Nitride GaN 59 Talus RTL 59 #G OTN [001] 59 strand mounted BelAir#S 59 ZL# [002] 59 LVDS transmitter 59 #.#V [002] 59 nanopositioning stages 59 embedded processor cores 59 ALTERA 59 Application Specific Integrated Circuits 59 Fiber Optic Transceiver 59 Frequency Converters 59 Intel #GME 59 AdvancedMC module 59 nanometer CMOS 59 #GbE SFP + 59 amplifier module 59 MPC#E 59 peripheral DMA 59 Laser Modules 59 infrasound picking 59 Marvell Sheeva 59 Encounter Timing System 59 HD H.# 59 #kHz switching 59 #V #.#A 59 Frame Synchronizer 59 asynchronous serial 59 SDI inputs 59 NI PXIe #E 59 I2C compatible 59 PowerBlox TM 59 Ripcord2 59 AFEs 59 CapSense Express 59 Vertical Cavity Surface Emitting 59 PowerQUICC III 59 Signal Conditioner 59 Field Effect Transistor 59 Devices PTCs 59 LiNbO3 59 IEEE #.#a/b/g 59 ferrite beads 59 duplexers 59 radioOne 59 ISSI Announces 59 sensor actuator 59 By SALLY SPAULDING 59 PSoC Creator IDE 59 AT#UC#L 59 input undervoltage lockout 59 TMS#DM# [001] 59 3U PXI 59 Manantan Yparraguirre 59 tunable DWDM 59 integrated transceivers amplifiers 59 Vpp 59 processor DSP 59 #GBASE T PHY 59 2MHz 59 ATMEL 59 AES EBU audio 59 fast Fourier transform 59 AVX Develops 59 & IC Substrates 59 XIO# 59 1kHz 59 DuNE 59 TOTAL RADIO TM 59 Intellon INT# 59 Dual Core E# 59 TMS#C#x TM 59 PMC Sierra Introduces 59 predistortion 59 shift keying FSK 59 NATIONAL ECONOMIC COUNCIL DIRECTOR 59 PE# [001] 59 fully synthesizable 59 Si#DB 59 CWDM SFP 59 VCOs 59 #WF Series 59 Denali Databahn 59 innovative FPGA PLD 59 GDDR5 memory paired 59 modulation PWM 59 RFR# 59 #.#Gbps [003] 59 Audio Power Amplifier 59 Fully Programmable 59 Gene Haschak Daily 59 By DEBORAH HIRSCH 59 CellMath IP 59 HDMI #.#b 59 Powering Connectivity 59 TLA# 59 CLC# 59 transceiver modules 59 electrostatic discharge protection