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Model 855B · RF & Microwave Signal Generators

Four phase-coherent channels. One rack unit.

A multi-channel RF and microwave signal generator with up to four phase-coherent channels in a 19-inch 1U rackmount, covering 300 kHz to 6, 12, 20, 33 or 40 GHz depending on model. Phase adjusts independently on each channel, and 3 GHz clock ports synchronize multiple units for higher channel counts.

Berkeley Nucleonics four-channel 1U multi-channel signal generator, front panel

Pictured: four-channel 1U front panel, as shown on the Model 855B datasheet.

40 GHz
Max. frequency
4
Channels in 1U
0.096 ps
Channel-to-channel phase stability (typ.)
−145 dBc/Hz
Phase noise, 100 kHz at 1 GHz (typ.)

View full datasheet →

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Five frequency models, one 1U platform.

Every model carries up to four channels in the same 19-inch 1U chassis. Connectors and attenuator range follow the frequency tier.

RF

855B-06

300 kHz to 6 GHz. RF outputs: SMA female. Option PE4 extends the power floor to −80 dBm.

Models
855B-06

Microwave

855B-12

300 kHz to 12 GHz. RF outputs: SMA female. Option PE4 extends the power floor to −80 dBm.

Models
855B-12

Microwave

855B-20

300 kHz to 20 GHz. RF outputs: SMA female. Option PE4 extends the power floor to −80 dBm.

Models
855B-20

Wideband

855B-33

300 kHz to 33 GHz. RF outputs: K (2.92 mm) female. Option PE4 extends the power floor to −50 dBm.

Models
855B-33

Widest span

855B-40

300 kHz to 40 GHz. RF outputs: K (2.92 mm) female. Option PE4 extends the power floor to −50 dBm.

Models
855B-40

Specified where phase actually matters.

Frequency range
300 kHz to 40 GHz
Top frequency 6, 12, 20, 33 or 40 GHz by model; <0.001 Hz resolution (typical)
Channels
Up to 4 in 1U
19-inch rackmount; high-isolation chassis with option HI
Output power
−20 to +25 dBm
Maximum varies by band, +18 dBm from 20 to 40 GHz; option PE4 extends the floor to −80 dBm (06/12/20) or −50 dBm (33/40)
Phase noise at 1 GHz
−145 dBc/Hz
Typical at 100 kHz offset; −130 dBc/Hz at 1 kHz; −98 dBc/Hz at 10 Hz with option LN
Channel-to-channel phase stability
0.096 ps
Typical, 3 mrad at 5 GHz over 5 hours; 0.160 ps between synchronized modules
Per-channel phase
0 to 360°
Individually adjustable on each channel, 0.1° resolution (typical)
Switching speed
500 µs
Sweep and list mode; 25 µs with option FS (1 or 2 channels, in band), 50 µs for 3 or 4 channels
Control interfaces
Ethernet, USB
GPIB optional; SCPI 1999 command set; 3 GHz CLK in/out for multi-unit sync

Specifications reproduced from the Model 855B datasheet (v1.74) as published at berkeleynucleonics.com. Typical values are expected mean values, not warranted performance. Phase noise is SSB at maximum output power with ALC off. LN, LN+, PE4, PHS, FS, MOD, VREF, HI, GPIB and FLASH are options.

Where the 855B goes to work.

Radar simulation
an internal pulse generator with pulse pattern modulation and staggered PRF, pulse widths from 25 ns, on up to four coherent channels.

Phased-array antenna and beamforming test
per-channel phase from 0 to 360° in 0.1° steps, with 0.096 ps typical channel-to-channel phase stability.

Electronic warfare
coherent multi-channel sources with list-mode switching down to 25 µs (option FS) and phase-coherent switching (option PHS).

High-volume automated testing
up to 10,000 list points per channel, external triggering with 5 ns delay resolution, and SCPI control over LAN, USB or optional GPIB.

Four coherent channels to 40 GHz, in one rack unit.

Talk to a Berkeley Nucleonics engineer about the Model 855B configuration for your test system.

Request a demo, quote or engineer chat Or call 800-234-7858