Specifications

Chapter 10 299

Block Diagrams

CDMA Analyzer Section

IF Conversion

To down convert the CDMA the signal, the 114.3 MHz IF is mixed with

a 110.6136 MHz LO to produce a 3.6864 MHz IF in the A2A120 LO

IF/IQ Modulator assembly, see Figure 10-11 on page 300. The oscillator

that produces the LO signal is phase locked to a 10 MHz signal from the

A2A100 CDMA Generator Reference assembly, see Figure 10-13 on

page 303.

CDMA Signal Analysis

The 3.6864 MHz signal goes to the A2A36 Receive DSP assembly, see

Figure 10-12 on page 301. The Receive DSP assembly analyzes the

3.6864 MHz signal to make IQ modulation measurements, such as rho,

timing accuracy, carrier feed through, and phase error.

Power Measurements

The A2A36 Receive DSP assembly also makes average power

measurements through a direct link from the A2A130 RF Input/Output

assembly.