Rohde & Schwarz FSVA - Page 507

Instrument Functions
R&S
®
FSVA/FSV
507Operating Manual 1176.7510.02 ─ 09
Examplary digital
input sample
rates
Possible output sample rates and the corresponding IQ bandwidths
Linear increase from the minimum
possible output sample rate up to
break point
Constant IQ bandwidth from break
point up to the maximum possible
output sample rate
minimum break point break point maximum
Example
ISR = 50 MHz
SR = 100 Hz
1)
BW = 0.8 * SR
= 80 Hz
SR = 0.95*ISR
= 47.5 MHz
BW = 0.8 * SR
= 38 MHz
SR = 0.95*ISR
= 47.5 MHz
BW = 0.76 * ISR
= 38 MHz
SR = 10 GHz
2)
BW = 0.76 * ISR
= 38 MHz
Example
ISR = 500 MHz
SR =ISR/
(2*1048576)
= 239 Hz
BW = 0.8 * SR
= 191.2 Hz
SR = 0.95*ISR
= 475 MHz
BW = 0.8 * SR
= 380 MHz
SR = 0.95*ISR
= 475 MHz
BW = 0.76 * ISR
= 380 MHz
SR = 10 GHz
2)
BW = 0.76 * ISR
= 380 MHz
Maximum:
ISR = 10 GHz
SR =ISR/
(2*1048576)
= 4.769 kHz
BW = 0.8 * SR
= 3.8152 kHz
SR = 0.95*ISR
= 9.5 GHz
BW = 0.8 * SR
= 7.6 GHz
SR = 0.95*ISR
= 9.5 GHz
BW = 0.76 * ISR
= 7.6 GHz
SR = 10 GHz
2)
BW = 0.76 * ISR
= 7.6 GHz
1)
max(ISR/(2*1048576), 100 Hz)
2)
min(254*ISR, 10GHz)
Table 3-18: Bandwidths depending on sample rate for active digital input (without R&S FSV-B70/
R&S FSVA-B40)
Examplary digital
input sample
rates
Possible output sample rates and the corresponding IQ bandwidths
Linear increase from the minimum
possible output sample rate up to
break point
Constant IQ bandwidth from break
point up to the maximum possible
output sample rate
minimum break point break point maximum
Minimum:
ISR =100 Hz
Not allowed
SR = 100 Hz
1)
BW = 0.76 * ISR
= 76 Hz
SR = 254 * ISR
= 25.64 kHz
BW = 0.76 * ISR
= 76 Hz
Example
ISR = 30 MHz
SR = 100 Hz
1)
BW = 0.8 * SR
= 80 Hz
SR = 0.95*ISR
= 28.5 MHz
BW = 0.8 * SR
= 22.8 MHz
SR = 0.95*ISR
= 28.5 MHz
BW = 0.76 * ISR
= 22.8 MHz
SR = 45 MHz
2)
BW = 0.76 * ISR
= 22.8 Hz
Example
ISR = 50 MHz
SR = 100 Hz
1)
BW = 0.8 * SR
= 80 Hz
SR = 45 MHz
2)
BW = 0.8 * SR
= 36 MHz
Not allowed
1)
max(ISR/(2*1048576), 100 Hz)
2)
min(254*ISR, 45 MHz)
Instrument Functions - R&S Digital I/Q Interface (Option R&S FSV-B17)