Berkeley Nucleonics' Model 845 RF Microwave Signal Generator is a low-noise and fast-switching microwave signal generator covering a frequency range from 9 kHz up to 26.5 GHz. The Model 845 Microwave RF Signal Generator offers a wide and accurately-levelled output power range with high spurious suppression. Advanced frequency synthesis with fractional-N divider makes for low SSB phase noise and micro-Hz frequency resolution.
The Model 845 is now available in 12, 20, & 26.5 GHz frequencies. In addition, the Model 845 can be customized and configured to each user's specific needs. Available with HP (high output power), LO (CW only, no modulation - only available on 20 GHz & 26.5 GHz), & R (1U rack mountable configuration).
Frequency and power switching time down to 10us
Exceptional phase noise performance: ◦500MHz at 1KHz offset: -131 dBc/Hz ◦4GHz at 1KHz offset: -115 dBc/Hz ◦20 GHz at 1 kHz offset: -100 dBc/Hz
Adjustable output power from -90dBm to +27dBm
Powerful triggering and sweep modes
USB, LAN, GPIB interfaces
Comprehensive analog modulation capabilities or only CW/LO
Compact, robust, and portable with internal rechargeable battery options
Phase-locking to any external reference from 1 to 250 MHz
Parameter Typ. Max. Note
CW mode
Frequency range 100 kHz
100 kHz
100 kHz
12.0 GHz
20.0 GHz
26.5 GHz
845-12
845-20 , settable to 20.5 GHz
845-26, settable to 30 GHz
resolution 0.001 Hz
Phase resolution 0.1 deg
Frequency / Amplitude settling time 200 ms 300 ms
30 ms
time from receipt of SCPI command
option FS
SSB Phase noise (standard)
500 MHz
10 Hz offset
1kHz offset
100 kHz offset
-74 dBc/Hz
-126 dBc/Hz
-137 dBc/Hz
4 GHz
10 Hz offset
1kHz offset
100 kHz offset
-68 dBc/Hz
-108 dBc/Hz
-119 dBc/Hz
20 GHz
10 Hz offset
1kHz offset
100 kHz offset
-51 dBc/Hz
- 91 dBc/Hz
- 104 dBc/Hz
Wideband noise -150 dBc/ Hz
SSB Phase noise (option LN)
200 MHz
1 Hz offset
10 Hz offset
1kHz offset
100 kHz offset
10 MHz offset
-89 dBc/Hz
-115 dBc/Hz
-133 dBc/Hz
-152 dBc/Hz
-158 dBc/Hz
4 GHz
1 Hz offset
10 Hz offset
1kHz offset
100 kHz offset
10 MHz offset
-62 dBc/Hz
-88 dBc/Hz
-115 dBc/Hz
-126 dBc/Hz
- 145 dBc/Hz
20 GHz
10 Hz offset
1kHz offset
100 kHz offset
10 Mhz
-74 dBc/Hz
- 100 dBc/Hz
- 113 dBc/Hz
-130 dBc/Hz
Amplitude Noise at 10 GHz -130 dBc/Hz
-140 dBm
Pout=+10 dBm, 100 kHz offset
noise floor
Parameter Min. Typ. Max. Note
Output power
Check maximum output power plots
on page 10
Standard
100 kHz to fmax -20 dBm +15 dBm
Option PE3 only
100 kHz to fmax -90 dBm +13 dBm
Option HP only -20 dBm
-20 dBm
-20 dBm
-20 dBm
18 dBm
+25 dBm
+23 dBm
+18 dBm
< 20 MHz
0.2 to 6 GHz
6 to 16 GHz, see plot
>16 GHz, see plot
Options HP and PE3 18 dBm < 20 MHz
0.2 to 10 GHz
10 to 16 GHz
16 to 20 GHz
20 to 24 GHz
-20 dBm
-90 dBm
-90 dBm
-90 dBm
-90 dBm
-90 dBm
+22 dBm
+20 dBm
+18 dBm
+15 dBm
+13 dBm > 24 GHz
Level resolution 0.01 dB
Level uncertainty, ALC on 0.3 dB 1.0 dB -15 to +15 dBm
-65 dBm to -15 dBm , option PE3
< -65 dBm, f<10 GHz option PE3
< -65 dBm, f>10 GHz option PE3
> 15 dBm to Pmax, option HP
0 to 45 °C
0.6 dB 1.5 dB
3.0 dB
3.0 dB
1.0 dB 3.0 dB
Temperature effects 0.015 dB/ °C
User flatness correction up to 2000
points
Output impedance 50 Ω
VSWR 1.5 < 20 GHz
2.0 > 20 GHz
Reverse Power Protection
DC Voltage ±15 V
RF power 30 dBm
Spectral purity at + 5 dBm
Output harmonics -40 dBc -30 dBc See plot
Sub-harmonics -75 dBc
-50 dBc
-65 dBc
-40 dBc
< 20 GHz
> 20 GHz
Non-harmonic spurious CW +10 dBm, > 3 kHz offset
< 312 MHz
> 312 to 625 MHz
> 625 MHz to 1.5 GHz
> 1.5 GHz to 2.5 GHz
> 2.5 GHz to 5 GHz
> 5 GHz to 10 GHz
> 10 GHz to 20 GHz
> 20 GHz
-80 dBc
-75 dBc
-75 dBc
-70 dBc
-65 dBc
-60 dBc
-55 dBc
-50 dBc
-66 dBc
-70 dBc
-65 dBc
-65 dBc
-60 dBc
-55 dBc
-50 dBc
-45 dBc
Residual FM @ 10 GHz
15 Hz
0.3 kHz to 3 kHz, weighted (ITU-T),
RMS
Residual AM @ 10 GHz 0.02 % RMS value (0.01 kHz to 15 kHz)
