8648A, 100 kHz to 1 GHz
8648B, 9 kHz to 2 GHz
8648C, 9 kHz to 3.2 GHz
8648D, 9 kHz to 4 GHz
Data Sheet
Agilent 8648A/B/C/D
Signal Generators
Specifications describe warranted instrument performance over the 0°C to 50°C temperature range and after a 30-minute warm-up, unless
otherwise noted. All performance below a carrier frequency of 250 kHz is typical. Supplemental characteristics are intended to provide
information useful in estimating instrument capability in your application by describing typical, but non-warranted performance.
2
Frequency
Range
8648A: 100 kHz to 1000 MHz
8648B: 9 kHz to 2000 MHz
8648C: 9 kHz to 3200 MHz
8648D: 9 kHz to 4000 MHz
Resolution
Settable
8648A/B/C/D: 0.001 Hz
Display
10 Hz
Accuracy
1
Typically ± 3x10–6x carrier frequency (Hz),
±0.15x10
–6
x carrier frequency (Hz) for Option 1E5
Switching speed (typical)
8648A/B/C/D
<1001 MHz: <75 ms
≥1001 MHz: <100 ms
Internal reference oscillator
Accuracy and stability
1
(typical, calibration adjustment dependent)
± Aging rate ± temperature effects ± line voltage effects
Output
10 MHz, typically >0.5 V
rms
level into 50 Ω
External reference oscillator input
Accepts 2, 5, 10 MHz ±10 ppm typical (±1 ppm typical
with option 1E5) and a level range of 0.5 V
rms
to 2 V
rms
into 50 Ω
Spectral purity
Harmonics
<–30 dBc (output ≤+4 dBm)
Subharmonics (output ≤+4 dBm)
<1001 MHz: <–60 dBc
≤3200 MHz: <–50 dBc
_4000 MHz: <–40 dBc
Nonharmonics (≥5 kHz offset, output ≤+4 dBm)
8648A/B/C/D
<249 MHz: <–55 dBc
<1001 MHz: <–60 dBc
<2001 MHz: <–54 dBc
≤4000 MHz: <–48 dBc
Residual FM (CCITT, rms)
8648A/B/C/D
<249 MHz: <7 Hz, typically <4 Hz
<501 MHz: <4 Hz, typically <2 Hz
<1001 MHz: <7 Hz, typically <4 Hz
<2001 MHz: <14 Hz, typically <8 Hz
≤4000 MHz: <28 Hz, typically <12 Hz
SSB phase noise (at 20 kHz offset, typical)
8648A/B/C/D
at fc 500 MHz: <–120 dBc/Hz
at fc 1000 MHz: <–116 dBc/Hz
at fc 2000 MHz: <–110 dBc/Hz
at fc 3000 MHz: <–106 dBc/Hz
at fc 4000 MHz: <–104 dBc/Hz
Typical phase noise of the 8648A/B/C/D at 500 MHz
1. After one hour warm-up and within one year of calibration.
2. After four days warm-up and within one year of calibration.
3. Applies over the 25°C ±5°C range.
4. Applies for line voltage change of ±5%.
Standard High stability
timebase timebase
(typical) (Opt 1E5)
Aging <±2 ppm/year <±0.1 ppm/year
2
<±0.0005 ppm/day
2
Temperature <±1 ppm <±0.01 ppm3 (typical)
Line Voltage
4
<±0.5 ppm <±0.1 ppm (typical)
3
Output
Range
8648A
+10 to –136 dBm
8648B/C/D
≤2500 MHz: +13 to –136 dBm
≤4000 MHz: +10 to –136 dBm
Maximum leveled power
(High power option 1EA)
8648B/C/D only
1
≤100 kHz: +17 dBm
≤1000 MHz: +20 dBm
≤1500 MHz: +19 dBm
≤2100 MHz: +17 dBm
≤2500 MHz: +15 dBm
≤4000 MHz: +13 dBm
Option 1EA—Typical power versus frequency (GHz)
Display resolution
0.1 dB
Accuracy
8648A/B/C/D
2,3,4
≤2500 MHz: ±1.0 dB
≤3200 MHz: ±1.5 dB
≤4000 MHz: ±2.0 dB
Reverse power protection (watts into 50 Ω)
≤2000 MHz: 50 watts
≤4000 MHz: 25 watts
SWR (output <–6 dBm, typical)
8648A/B/C/D
<249 kHz: <2.5:1
<2500 MHz: <1.5:1
≤4000 MHz: <2.0:1
Output impedance
Nominally 50 ohms
Amplitude modulation (f
c
>1.5 MHz)
5
Range
0 to 100% (output ≤+4 dBm)
Resolution
0.1%
Accuracy
6
(1 kHz rate)
±5% of setting ±1.5%
Rates
8648A/B/C/D
Internal: 400 Hz or 1 kHz or 10 Hz to 20 kHz with Opt 1E2
External: DC: dc to 25 kHz (typical, 3 dB BW)
AC: 1 Hz to 25 kHz (typical, 3 dB BW)
Distortion (1 kHz rate, THD+N, 0.3 to 3 kHz BW)
(at 30 % AM): <2%
8648A (at 90% AM): <3%
8648B/C/D (at 70% AM): <3%
FREQUENCY (MHZ)
0 800 1600 2400 3200 4000
DBM
13
15
17
19
21
23
1. Combining option 1E6 with 1EA reduces maximum output power by 2 dB above 100 MHz.
Below 100 MHz, maximum output is +13 dBm (typically+16 dBm for carrier frequencies
between 100 kHz and 100 MHz).
2. Accuracy is valid from maximum specified output power to –127 dBm.
Below –127 dBm, accuracy is typically ±3 dB in the range 100 kHz to 2500 MHz, and is
not specified outside this frequency range
3. Accuracy applies at 25°C ±5°C; and typically degrades up to ±0.5 dB over 0°C to 50°C
or at output power levels >13 dBm.
4. Accuracy is ±3 dB for power levels between –100 dBm and –127 dBm for frequencies
below 100 kHz or above 2500 MHz.
5. AM is typical above 1001 MHz.
6. AM accuracy applies at 25°C ±5°C and at <70% depth: it is typically ±7% of setting ±1.5%
over 0°C to 50°C.
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