آر اف (فرکانس رادیویی) و بی‌سیم سایر آی سی‌ و ماژول‌های آر اف

Product Attributes

Introduction

A Cartesian Loop improves the efficiency and linearity of transmitters for non-constant envelope modulation systems. The CMX998 is an integrated solution for a Cartesian Feedback Loop based linear transmitter. Acting as a direct conversion quadrature mixer from I and Q to RF output, it provides the capability to linearize the Power Amplifier (PA) via feedback from the PA's output. Included are forward and feedback paths; local oscillator circuitry including loop phase control; an instability detector and uncommitted op-amps for input signal conditioning. The device operates from a single 3.3V supply over a temperature range of -40℃ to +85℃ and is available in a 64-pin VQFN (Q1) package.

Features

• Frequency Range 30MHz to 1GHz
• Wide Band Noise –148dBc/Hz
• C-BUS (SPI compatible) Serial Interface
• Gain Control Error Amplifier
• Up Converter Forward Path
• Down Converter for Feedback Linearisation
• 360° Loop Phase Shift Control
• DC Offset Measurement Output
• Open Loop Function
• Instability Detector
• Flexible Digital Interface

Applications

• TETRA Terminals
• TETRA 2 Terminals
• APCO P25 Phase 2
• Mobile Satellite Terminals
• Linear Modulation Schemes: QPSK, π/4 -DQPSK, 8PSK, QAM, OFDM, F4FM, etc.
• Direct Interface to CMX981, CMX980A and CMX7163/CMX7164