---
title: August 30th, 2018 - Product Update - Model 855 Multi-Channel Signal Generator Now up to 40 GHz
date: 2018-09-28T16:49:41Z
modified: 2025-10-01T04:48:19Z
permalink: "https://www.berkeleynucleonics.com/august-30th-product-update-model-855-multi-channel-signal-generator-now-40-ghz/"
type: post
status: publish
excerpt: ""
wpid: 13215
categories:
  - Uncategorized
featured_image: "https://www.berkeleynucleonics.com/wp-content/uploads/855_with_computer.png"
featured_image_alt: Model 855 with Rackmount
---

Berkeley Nucleonics model 855 multi-channel signal generator products are now available up to 40 GHz, enabling excellent frequency stability, phase coherence and extremely fast tuning speed. Each channel can be programmed independently in frequency, phase, amplitude, and modulation.

**Channel-to-channel phase coherence:** With the new generation of the model 855, the channel-to-channel phase coherence has considerably improved. While the phase error was ±10 mrad (0.6 degrees) at 1 GHz over a period of 10 hours on the old generation, it is now less than ±1 mrad (0.06 degrees) on the new generation.

**Unit-to-unit phase stability:** Thanks to the dedicated clock synchronization mode that was added on the new generation, the unit-to-unit phase coherence is equivalent to the one achieved within a single unit. Thus, it is possible to extend a single unit to virtually any number of channels while the phase coherence remains unaltered.

[Read the App note here](https://www.berkeleynucleonics.com/sites/default/files/products/resources/model_855_app_note_-_phase_coherence.pdf)