Base Station & Wireless Infrastructure Solutions

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National Semiconductor offers a wide range of high performance, energy-efficient PowerWise® signal path, power management, and interface solutions for 2G, 3G, and 4G wireless infrastructure systems, including LTE/UMTS/TD-SCDMA wireless base stations (BTS), backhaul, femptocells, and MIMO remote radios and enabling:

  • Multi-standard base stations
  • Higher speeds at lower cost per bit
  • Increased data/voice capacity
  • Wider coverage
 

Comms Infrastructure Guide
(pdf)

ADC12Dxx00RF Direct RF-Sampling ADCs Sample Beyond 2.7 GHz at up to 3.6 GSPS

Breakthrough RF-Sampling ADCs Revolutionize Radio Architectures

National's 12-bit direct RF-sampling ADCs can directly sample input frequencies up to and beyond 2.7 GHz at up to 3.6 GSPS. A single direct RF-sampling ADC can replace an entire IF-sampling or ZIF-sampling radio signal path subsystem of mixers, LO synthesizers, amplifiers, filters, and ADCs, drastically reducing bill of materials (BOM) cost, design time, and board size, weight, and power. A wide array of applications such as 3G/4G wireless basestations, microwave backhaul, military, and wideband software-defined radio (SDR) can now achieve the benefits that RF-sampling provides.

The ADC12Dxx00RF family of ADCs improves upon National's existing 12-bit GSPS ADC products by expanding the frequency range over which National's superior dynamic range can be realized. The ADC12Dxx00RF delivers its excellent noise and linearity performance at RF frequencies beyond the 7th Nyquist zone. These five new ADCs are available in speed grades ranging from dual-channel 500 MSPS to single-channel 3.6 GSPS. They are pin-compatible with National's ADC12D1x00 and ADC10D1x00 families, enabling system designers to reuse a single design for multiple speed and resolution combinations.

  
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Direct RF Sampling Reduces Cost, PCB Area, and Time-to-Market Versus Traditional IF- and ZIF-Sampling

 

Multi-Standard Base Station Block Diagram (click blocks for products)

National Solutions for Wireless Infrastructure Base Stations (BTS) Isolated Power Management OR-ing FET Controllers System Protection, Monitoring, & Hot Swap Controllers Voltage References & Current References Linear Regulators/LDOs Point-of-Load (PoL) Switching DC-DC Converters DDR Memory VDDQ, VTT, & VREF Power Thermal Management Stackable Multiphase Power - High Output Current Serializers/Deserializer (SerDes) Power Management WEBENCH FPGA Power Architect - Optimized FPGA Power Supplies in Minutes Thermal Management M-LVDS Transceivers Precision ADCs Jitter Cleaners & Clock Distribution Frequency Synthesizers/PLLs Gigasample ADCs Differential Amplifiers Differential Amplifiers RF Power Detectors Ethernet PHYs & Ethernet PHYs with IEEE 1588 RS-485, RS-422/3, & RS-232 Transceivers LVDS & CML Crosspoint Switches & Muxes LVDS & CML Signal Conditioning Repeaters & Equalizers JTAG/Boundary Scan Serializers/Deserializers (SerDes) Frequency Synthesizers/PLLs Thermal Management High-Speed MSPS ADCs Variable Gain Amplifiers/VGAs/DVGAs

Data Converters

Clock Jitter Cleaning / Clock Generation

  • Lowest phase noise clock solutions
  • Improves ADC SNR and local oscillator phase noise performance for better remote radio head (RRH) performance
  • Clock jitter cleaners

Frequency Synthesizers

  • Lowest phase noise fractional frequency synthesizers
  • Improved receiver sensitivity and transmit error-vector-magnitude (EVM)
  • Frequency synthesizers/PLLs

High-Speed Amplifiers / DVGAs

System Monitoring

Interface

Power Management
   

Wireless Infrastructure Design Resources

Application Notes

  • Communications Infrastructure Solutions Guide - A comprehensive guide to National's solutions for base stations and other comms infrastructure systems
  • SP-111 - Selecting Amplifiers, ADCs, and Clocks for High-Performance Signal Paths.
  • AN-1558 - Clocking High-Speed A/D Converters
  • AN-1704 - High-Speed ADC Input Driver
  • AN-1716 - Driving High-Speed ADCs  
  • AN-1718 - Diff Amp Apps Up to 400 MHz
  • AN-1719 - Noise Analysis - Fully Diff. Amp
  • AN-1721 - High-Speed ADCs - Interfacing, Driving, and Clocking
  • AN-1950 - Silently Powering Low-Noise Applications

Related Links 

The reference designs include ADCs, front-end amplifiers, timing components, and power supply regulation.

High-IF Sub-sampling Receiver Subsystem with Dual 16-bit 160 MSPS ADC16DV160, LMH6517, LMK04031B

  • Small signal SNR of 72.7 dBFS and SFDR greater than 92 dBFS
  • Largesignal SNR of 71 dBFS and SFDR greater than 80 dBFS

Low IF Receiver System with 16-bit 130 MSPS ADC16V130, LMK04031B, LP5900, LP3878

  • Small-signal (-20 dBFS) SNR of 78 dBFS and SFDR > 94 dBFS
  • Large-signal (-1 dBFS) SNR of 75.8 dBFS and SFDR > 84 dBFS
  • Total integrated jitter < 250 fs
  • Watch video overview

High IF Receiver System with 14-bit 155 MSPS ADC14V155, LMH6515, LMK03001C

  • Reference design performance for a 169 MHz input signal
  • Small-signal SNR of 72 dBFS and SFDR > 90 dBFS
  • Large-signal SNR 68.3 dBFS and SFDR of 77 dBFS

Low IF Receiver System with Dual 14-bit 105 MSPS ADC14DS105, LMH6552, LMK02000

  • Reference design performance for input signals up to 40 MHz
  • Small-signal SNR of 74 dBFS and SFDR greater than 90 dBFS
  • Large-signal SNR of 73.3 dBFS and SFDR greater than 85 dBFS

 

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