Technology

Tools

NanoSemi’s QuadTool provides a unique way to visualize the performance improvement that comes with NanoSemi’s DPD. You can drag the Bandwidth marker to a value that reflects your use case, and then select any combination of High, Medium, or Nominal Performance to explore quality vs computational resource tradeoff.

Instructions:

  • STEP 1: Drag Bandwidth marker (point on the top) to the desired value.
  • STEP 2: Mouse-over the other three points to display their values.
  • STEP 3: Click “Download” to save the current image displayed on the screen.
  • STEP 4: Click “Medium Performance” and “Normal Performance” on the lower right corner to explore the design tradeoffs.

Measurement Conditions:

  • Compensation bandwidth = 240𝑀𝐻𝑧
  • OPBO (Output Power Back Off) = 𝑃3𝑑𝐵−𝑃𝑂𝑈𝑇−𝑃𝐴𝑃𝑅
  • Computational Resource Utilization is provided relative to a reference FPGA design N

NanoSemi’s Performance Tool shows the improvement in linearity that NanoSemi’s DPD provides for a wide range of signal configurations and power amplifier output power ratings. Use the drop-down menus below to select your linearization scenario, and the Performance Tool will display RF spectrum plots and signal measurements demonstrating the results of linearization. RF spectrum plots are collected as part of comprehensive laboratory testing.

Instructions:

  • STEP 1: Select Duplex Mode
  • STEP 2: Select Band Configuration
  • STEP 3: Select PA Average Output Power
  • STEP 4: Select Carrier Configuration
  • REPEAT for other scenarios

 

Duplex Mode:
Band Configuration:
PA Average Output Power (dBm):
Carrier Configuration

[Carrier Configuration]
Parameter Value
Power output
Carrier Configuration
Bandwidth
Carrier Frequency
Sampling Rate
P3dB-POUT-PAPR
Power Efficiency
ACLR Value
Technology
PA Topology
Duplex Mode
Comments

White Papers & Test Reports

ELEVATING RADIO PERFORMANCE TO NEW THRESHOLDS

The advancing Wi-Fi and 3GPP specifications are putting pressure on power amplifier designs and other RF components. NanoSemi’s Linearization and Characterization Technologies elevate the performance of the entire RF signal chain.

The evolution of IEEE and 3GPP standards is putting greater pressure on radio systems.  The radio chain is the interface between the modem and spectrum; therefore, improving the performance of the radio chain is critical to increasing the data rates, spectral and power efficiencies being required of standards such as IEEE802.11ax and 3GPP 5G.  NanoSemi’s Linearization and Characterization techniques improve radio chain power efficiency and signal cleanliness at unprecedented bandwidths.  The small implementation size is cost effective for integration into ASICs that support Wi-Fi or into LTE/5G chips for smartphones. For further information, please contact us via email at info@nanosemitech.com.

Test Report with WiFi 160MHz 802.11ax MSC11 (1024QAM) Signals

We present measured results of using NanoSemi’s Linearizer for WiFi system. NanoSemi’s linearizer demonstrates 802.11ax performance; 1024 QAM and160MHz while achieving 15% power efficiency at output power of 23 dBm. We used a commercially available power amplifier from Skyworks, SE5003L1-R. It is rated for upto 80MHz/802.11ac by the manufacturer.

RF Spectrum at the output of the power amplifier.

EVM for 1024-QAM measured at the output of power amplifier.

Test Report With WiFi 160MHz Signals for HIGH EFFICIENCY POWER AMPLIFIER

This reports presents the results of using NanoSemi’s Linearizer for W-Fi systems. We show that NanoSemi’s linearizer can greatly enhance the performance of a power amplifier to full 802.11ax specifications. Most significantly the power efficiency of >20% is achieved while meeting EVM >-40dB, thereby significantly improving battery life of a mobile device since the PA is a significant power consumer.
The results are provided for a commercially available high efficiency power amplifier from Skyworks Inc.

Test Report With WiFi 160MHz Signals for HIGH LINEARITY POWER AMPLIFIER

This reports presents the results of using NanoSemi’s Linearizer for W-Fi systems. We show that NanoSemi’s linearizer can greatly enhance the performance of a power amplifier to full 802.11ax specifications. Most significantly it can more than double the PA efficiency, thereby significantly improving battery life of a mobile device since the PA is a significant power consumer.
The results are provided for a commercially available power amplifier from Skyworks Inc., SKY85408-11.

This reports presents the results of using NanoSemi’s Linearizer for W-Fi systems. We show that NanoSemi’s linearizer can greatly enhance the performance of a power amplifier to full 802.11ax specifications. Most significantly the power efficiency of >25% is achieved while meeting EVM >-40dB, thereby significantly improving battery life of a mobile device since the PA is a significant power consumer.

FAQs

  • Semiconductor type: GaN, Si, GaAs
  • Device type: HEMT, HBT, LDMOS
  • Circuit type: Doherty, Class AB

Psat – PAR. Psat is defined as 3dB compression point of power level over the entire operating bandwidth, and PAR is peak-to-average ratio

Absolute power level can range from 0.25W (24dBm) to 100W (50dBm)

Please see RF Spectrum Tool under Tools section.

NanoSemi’s linearizer is currently using Xilinx FPGAs such as ZC706-2, ZC706-3, and Virtex 7 evaluation boards because the FMC connectors of FPGA and CMOS transceiver evaluation boards are pin-compatible.

However, NanoSemi’s linearizer IP is open to any FPGA and ASIC as long as the FPGA and ASIC processing resources and interfaces are defined in advance.

NanoSemi’s adaptation engine can be implemented either in logic or ARM processor, depending on the system requirement and FPGA resource utilization.

Sampling rate is set to at least 2.5x the maximum instantaneous bandwidth (iBW) targeted for the radio. If the largest bandwidth is 100MHz, the compensation bandwidth is 250MHz. If the digital filter inside the transceiver limits an operating bandwidth of DAC and ADC to 80%, the sampling rate of DAC is not equal to the compensation bandwidth. For instance, the compensation bandwidth is 245MHz if the sampling rate is 307MSPS w/ 80% usable bandwidth.

  1. Baseband signal, quality control and carrier configurations (component carrier width and carrier number) are provided to the input of NanoSemi’s CFR block.
  2. The gating signal transition should be >6us before and after the data transition
  3. Measure ACLR under different time slots

NanoSemi’s technology is available via MyDPD Evaluation Platform.