Chapter 498

High linearity components simplify direct conversion receiver designs

Cheng-Wei Pei

Abstract

Signal chain devices that offer high linearity and excellent noise specifications and can greatly simplify the design of high frequency receivers are described.

Keywords

RMS to DC conversion

LT5575 direct conversion demodulator

LTC6406 amplifier

LTC2299 14-bit ADC

Introduction

A direct conversion radio receiver takes a high frequency input signal, often in the 800MHz to 3GHz frequency range, and utilizes one mixer/demodulator stage to convert the signal to baseband without going through an intermediate frequency (IF) stage. The resulting low frequency (baseband) signal spectrum has useful information at frequencies from DC to typically ...

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