SLWS213A January   2010  – November 2015 TRF370417


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 RF Output Parameters
    7. 6.7 Typical Characteristics
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
    4. 7.4 Device Functional Modes
      1. 7.4.1 Baseband Common-Mode Voltage
      2. 7.4.2 LO Drive Level
  8. Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Basic Connections
        1. ESD Sensitivity
      2. 8.1.2 GSM Applications
      3. 8.1.3 WCDMA Applications
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. DAC-to-Modulator Interface Network
      3. 8.2.3 Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Device Nomenclature
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information



7 Detailed Description

7.1 Overview

TRF370417 is a low-noise direct quadrature modulator with high linearity, capable of converting complex modulated signals from baseband or IF directly to RF. With high-performance and superior-linearity, the TRF370417 is an ideal device to up-convert to RF frequencies from 50-MHz through 6-GHz. The baseband inputs can support an input bandwidth up to 1-GHz. The modulator is implemented as a double-balanced mixer. The RF output block contains a differential to single-ended converter to drive a 50-ohm load without the need for external matching components. The baseband input common-mode voltage is set at 1.7-V for optimum linearity performance.

7.2 Functional Block Diagram

TRF370417 b0175-01_lws184.gif


NC = No connection

7.3 Feature Description

TRF370417 supports an I/Q baseband input bandwidth of 1-GHz. With this bandwidth capability the input signal can be centered at a high IF frequency to provide frequency separation from unwanted carrier feed-through or sideband image. Utilizing the full baseband bandwidth yields an RF output bandwidth up to 2-GHz.

7.4 Device Functional Modes

7.4.1 Baseband Common-Mode Voltage

TRF370417 input baseband pins operate around a common-mode voltage of 1.7-V. Variation around this common-mode is possible but best linearity performance is generally achieved when kept at nominal voltage.

7.4.2 LO Drive Level

The LO drive level is nominally specified at 4-dBm. The device can accept a large range of LO drive level. A higher drive level generally provides better output noise performance and some linearity improvement. There is some trade-off between carrier feed-through and sideband suppression performance that is dependent on frequency and drive level. The LO drive level of 4-dB is deemed a good balance between those two parameters across frequency.