Creating and Downloading User-Data Files

Pattern RAM (PRAM) Data Downloads (E4438C and E8267D)

E4438C ESG

Customa

TDMAb

 

 

E2867D PSG

Customa

a. For ESG, requires Option 001, 002, 601, or 602, for PSG requires Option 601 or 602.

b.Real-time TDMA modulation formats require Option 402 and include EDGE, GSM, NADC, PDC, PHS, DECT, and TETRA.

PRAM files differ from bit and binary user files.

Bit and binary user files (see page 286) download to non- volatile memory and the signal generator loads the user file data into PRAM (volatile/waveform memory) for use. The signal generator adds the required control bits when it generates the signal.

A PRAM file downloads directly into PRAM, and it includes seven of the required control bits for each data (payload) bit. The signal generator adds the remaining control bits when it generates the signal. You download the file using either a list or block data format. Programs such as MATLAB or MathCad can generate the data.

This type of signal control enables you to design experimental or proprietary framing schemes.

After selecting the PRAM file, the signal generator builds the modulation scheme by reading data stored in PRAM, and constructing framing protocols according to the PRAM file data and the modulation format. You can manipulate PRAM data by changing the standard protocols for a modulation format such as the symbol rate, modulation type, and filter either through the front panel interface or with SCPI commands.

Understanding PRAM Files

The term PRAM file comes from earlier Agilent products, the E443xB ESGs. PRAM is another term for waveform memory (WFM1), which is also known as volatile memory. This means that PRAM files and waveform files occupy the same memory location. The signal generator’s volatile memory (waveform memory) storage path is /user/BBG1/waveform. For more information on memory, see “Signal Generator Memory” on page 281.

The following figure shows a PRAM byte and illustrates the difference between it and a bit/binary user file byte. Notice the control bits in the PRAM byte.

MSB

LSB

MSB

LSB

PRAM File Data Byte:

 

1 1 0 1 0 1 0

 

1

 

User File Data Byte: 1 0 0 1 1 1 0 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Control bits

Payload bit

 

Payload Bits

 

 

 

 

 

 

 

 

 

Only three of the seven control bits elicit a response from the signal generator. The other four bits are reserved. Table 8- 5 describes the bits for a PRAM byte.

Table 8-5 PRAM Data Byte

Bit Function

Value Comments

0

Data

0/1

This is the data (payload) bit. It is “unspecified” when burst (bit 2) is set to 0.

310

Agilent N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide

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Agilent Technologies N5181A/82A, N5183A MXG, E8663B manual Understanding Pram Files, Pram Data Byte
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N5183A, N5183A MXG, E8663B, N5181A/82A specifications

Agilent Technologies is renowned for its innovative solutions in electronic test and measurement equipment. Among its offerings are several signal generators including the N5181A, N5182A, E8663B, and N5183A MXG. These models are distinguished not only by their performance but also by their versatility across various applications in communications, aerospace, and electronics.

The Agilent N5181A and N5182A, part of the MXG family, are highly versatile signal generators known for their exceptional frequency performance and flexibility. The N5181A operates from 100 kHz to 6 GHz, while the N5182A extends that range up to 12 GHz. They provide high fidelity signals with low phase noise, making them ideal for the development and testing of RF components and systems. These generators support a wide variety of modulation formats, including AM, FM, PM, and pulse modulation, catering to diverse application needs.

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The N5183A MXG signal generator enhances the lineup with frequency coverage up to 6 GHz and advanced capabilities. It integrates various modulation capabilities while ensuring high signal integrity. Its architecture is tailored for both production test environments and research applications, providing users with the flexibility to adapt to changing testing requirements.

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