BTC Z22 Uživatelský manuál stáhnout pdf (Strana 12)

Version 02.00, November 2014

12 Rohde & Schwarz R&S

BTC Broadcast Test Center

I/Q modulation

I/Q modulation performance

Operating modes

external wideband I/Q,

internal baseband I/Q

RF modulation bandwidth

with external wideband I/Q inputs, I/Q wideband on

1 MHz ≤ f ≤ 4 GHz

±25 % of carrier frequency

f > 4 GHz

±1 GHz

with external wideband I/Q inputs, I/Q wideband off

f ≤ 1000 MHz

±10 % of carrier frequency

f > 1000 MHz

±100 MHz

with internal baseband I/Q, I/Q wideband on

1 MHz < f ≤ 320 MHz

±25 % of carrier frequency

f > 320 MHz

±80 MHz

RF frequency response in specified

RF modulation bandwidth

with external wideband I/Q inputs

I/Q wideband on

< 9 dB, < 6 dB (meas.)

I/Q wideband off

< 5 dB, < 3 dB (meas.)

with internal baseband I/Q, I/Q wideband

on, optimization mode = high quality

< 1.0 dB, < 0.3 dB (meas.)

Carrier leakage

mode: internal baseband I/Q,

referenced to full-scale input

< –55 dBc

Suppression of image sideband for entire

instrument in modulation bandwidth

mode: internal baseband I/Q,

up to 80 MHz I/Q BW

> 50 dB, 60 dB (typ.)

Two-tone IMD (2 carriers)

PEP = 0 dBm

up to 80 MHz carrier spacing

< –40 dBc (typ.)

I/Q impairments (analog)

These impairments are set within the analog I/Q modulator section. They can be used

in external wideband I/Q mode and internal baseband I/Q mode. They cannot be

applied to the analog or digital I/Q outputs.

I offset, Q offset

setting range

–10 % to +10 %

resolution

0.01 %

gain imbalance

setting range

–1.0 dB to +1.0 dB

resolution

0.01 dB

quadrature offset

setting range

–10° to +10°

resolution

0.01°

Value applies after 1 hour warm-up time and recalibration for 4 hours of operation and temperature variations of less than +5 °C.

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