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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 500

WCDMA ACPR and AltCPR measurements

Doug Stuetzle

Abstract

Setups for the measurement of adjacent channel power ratio (ACPR) and alternate channel power ratio (AltCPR) are described.

Keywords

Adjacent channel power ratio

ACPR

Alternate channel power ratio

AltCPR

LT5528

Introduction

ACPR (adjacent channel power ratio) and AltCPR (alternate channel power ratio) are important measures of spectral regrowth for digital communication systems that use, for example, WCDMA (wideband code division multiple access) modulation. Both ACPR and AltCPR quantify the ratio of regrowth in a nearby channel to the power in the transmitted channel (Figure 500.1).

Figure 500.1 WCDMA ACPR Limits, Per 3GPP TS 25.104, Section 6.6.2.2.1

To measure ...

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