Atec PNG7109 User Manual

png7000 series

PRECISION

NOISE

GENERATORS

(AWGN)

General Specifications:

Output White Gaussian noise

Crest factor 18 dB minimum

Output noise power +3 dBm

Noise attenuator 0 to 63 dB in

range 0.25 dB steps

Noise attenuator ±0.2 dB or 0.5%

accuracy at 1 - 500 MHz

±0.2 dB or 1%

at 0.5 - 1.0 GHz

±0.3 dB or 2%

at 1 - 2 GHz

Signal path gain 0 ±1 dB

Group delay variation ±0.2 ns/40 MHz

Standard connectors BNC female

Dimensions 17 in. wide x 5.25 in.

high x 12.5 in. deep

Mounting Front panel handles

and fold-down feet

for bench mounting.

Brackets included for

19 in. rack mounting

Power 115 VAC, 60 Hz (230

VAC, 50 Hz optional)

Operating -10oC to +60oC

temperature

Specifications subject to change without notice.

The PNG7000 Series instruments generate additive white Gaussian noise and provide a summing input to perform signal-to-noise or carrier-to-noise ratio testing capability. A key feature of this instrument is its low distortion signal path which sums the user-supplied signal with the internal precision white noise source. The signal path has a nominal insertion gain of

0 dB, with very low amplitude and phase ripple. The noise source provides

an exceptionally high crest factor of 18 dB for accurate bit error

rate testing, even with large carrier-to-noise (CNR) or bit energyto-noise density (E

bNo

) ratios. With option 7

(DC instead of AC coupled) signal path, the

PNG7000 can add noise directly to a digital TTL,

ECL, or similar signal that operates in a 50-ohm system.

The standard PNG7000 is a broadband device. For applications in which the frequency range is limited, the unit can be configured with up to five band-limited noise sources, each optimized for flatness over the specified frequency band.

The PNG7000 Series is microprocessor-controlled and continually provides information about operation of the instrument on a 4 x 20 character LCD display. The instruments allow control of the noise level, noise on/off, signal on/off, and noise source selection in three ways: at the front panel keypad, remotely via IEEE-488 bus, or automatically under program control.

The PNG7000 instruments can be integrated into a test station under software control (Lab Windows drivers are available from National Instruments) and with the aid of a precision power meter, carrier-to-noise ratios can be set.

www.noisecom.com

1 MHz TO 2 GHz

Rev Date 5/15/03

Once a CNR calibration has been performed, the ratio can be changed using the internal precision attenuator to vary the noise power without degrading accuracy . The output noise power level is factory calibrated at a 0 dB attenuator setting and is displayed in dBm/Hz.

Every front panel operation except instrument on/off is programmable, and the user can create up to nine test routines that can run automatically under program control. These routines can include delay times and loops, and can be executed manually or via bus control. The routines are easily written using the program key , and information on the display guides the user through the next steps.

Applications:

• C/N Ratio T esting

• E

b/No

T esting

• AWGN

• CCITT G.95

• SONET

• Data regenerators

• Multiplexers

• Hard disk drives

To order call 201-261-8797

OPTIONS

Option Number Description

PNGopt01 SMA female input and output PNGopt02 75 ohms input and output impedance PNGopt03 230 VAC, 50 Hz PNGopt04 Switch including up to 5 noise sources PNGopt05 RS232 in addition to standard IEEE-488 interface PNGopt06 127 dB signal attenuator in 1 dB steps PNGopt07 DC coupled signal path (6 dB RF Loss)

PNG7000 SERIES

MODEL FREQUENCY OUTPUT CHARACTERISTICS

RANGE POWER (dBm) Vrms dBm/Hz FLATNESS(dB)

PNG7105 1 MHz - 10 MHz +3 0.316 -67 ±0.25 PNG7107 10 MHz - 100 MHz +3 0.316 -77 ±0.25 / 40 MHz PNG7108 10 MHz - 500 MHz +3 0.316 -84 ±0.25 / 40 MHz PNG7109 10 MHz - 1 GHz +3 0.316 -87 ±0.25 / 40 MHz PNG7110 10 MHz - 1.5 GHz +3 0.316 -89 ±0.25 / 40 MHz PNG7111 1 GHz - 2 GHz +3 0.316 -87 ±0.25 / 40 MHz PNG7112 10 MHz - 2 GHz +3 0.316 -87 ±0.25 / 40 MHz

PNG7000 SERIES

NOISE GENERATORS

Lab Windows Drivers available

from National Instruments

Rev Date 5/15/03