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Booster / Booster-HL Specification and Characterization

Specification and characterization note based on the Booster wiki and selected issue history. Intended as a living technical reference for the project.

1. Scope

This document combines:

  • product-level information from the public Booster wiki,
  • measurement and behavior data from selected public issues.

It distinguishes between two variants:

  • Booster — optimized for high efficiency,
  • Booster-HL — optimized for high linearity.

Each measurement is linked directly to the source issue or issue comment where it was reported.

2. Product Overview

Booster is an eight-channel RF power amplifier providing several watts of RF between 40 MHz and 500 MHz in a 2U high 19-inch chassis.

According to the wiki, Booster is optimized for:

  • low cost,
  • low power consumption,
  • good RF performance,
  • full interlocking and logging via an Ethernet-based remote interface.

Source:

3. Variants

The wiki states that Booster is offered in two variants:

3.1 Booster

  • optimized for high efficiency

3.2 Booster-HL

  • optimized for high linearity
  • wiki statement: it offers the second harmonic at -40 dBc level

Source:

4. Platform Features

From the wiki:

  • Ethernet interface for monitoring and configuration
  • User-configurable interlocks protecting both Booster and connected loads
  • Per-channel remote monitoring of:
  • input power
  • output forward power
  • output reverse power
  • temperature
  • current
  • voltage
  • Remote shutdown of individual channels via Ethernet
  • Open source hardware and firmware
  • Modular design with individually field-replaceable channels, e.g. for changing frequency band

Source:

5. Interlocks and Protection

The wiki describes the following interlocks:

5.1 Output forward power

  • implemented in hardware
  • response time: a few microseconds
  • user-adjustable threshold up to 39 dBm
  • primarily intended to protect sensitive loads such as AOMs from excessive RF power

5.2 Output reverse (reflected) power

  • fixed threshold: 30 dBm
  • primarily intended to protect Booster itself from damage

5.3 Current consumption

  • monitors internal 30 V and 6 V supplies
  • includes hardware fold-back protection on the 30 V PA supply

5.4 Temperature

  • software protection disables a channel when temperature reaches 60 C
  • thermal switch cuts power to the entire chassis at 80 C

5.5 Interlock behavior

  • when any interlock trips, input RF is disconnected using an internal RF switch
  • in an error condition, the amplifier power stage is also shut down
  • interlocks can be cleared by:
  • front-panel INTERLOCK CLEAR button,
  • remote programming interface,
  • power cycling
  • error conditions require power cycling

Source:

6. Diagnostics and User Interface

From the wiki:

  • input, output forward, and output reverse powers can be queried remotely
  • channel temperature and fan speed can be queried remotely
  • reported power values clip to the lowest accurately measurable value at very low power
  • the onboard power readings are useful operational diagnostics, but should not be treated as test-and-measurement-grade RF instrumentation
  • high VSWR can lead to dB-level errors in forward power readings

Front panel switches

  • INTERLOCK CLEAR
  • STANDBY

Installation notes from the wiki

  • by default, all channels are disabled at power-up
  • MAC address can be obtained via the macconfig command in the VCP interface
  • minimum fan level can be configured via fanlevel
  • wiki guidance suggests checking typical idle current draws:
  • 29 V should be approximately 50 mA with no RF
  • 6 V should be approximately 250 mA

Source:

7. RF Input

The RF input is protected using two TVS diodes SZNUP1301ML3T1G.

Key notes for the input stage:

  • each TVS diode will continuously conduct approximately 215 mA
  • after exceeding an input power of approximately 11 mW, the input behavior becomes reflective rather than absorptive
  • in that regime the input can tolerate much more than 25 dBm
  • under normal operation, the input is typically driven at 0 dBm

This is a design and usage note. Final guaranteed limits should be cross-checked against the schematic and dedicated input-protection calculations.

8. Characterization Data from Public Issues

This section summarizes selected issues that are useful as source material for characterization.


8.1 Booster-HL characterization

8.1.1 HL spectrum at 150 MHz, 30 dBm

Issue source:

Image: Booster-HL spectrum at 30 dBm

Use:

  • representative spectrum plot for Booster-HL

Status:

  • typical characterization plot

8.1.2 HL spectrum at 150 MHz, 33 dBm

Issue source:

Image: Booster-HL spectrum at 33 dBm

Use:

  • representative spectrum plot for Booster-HL

Status:

  • typical characterization plot

8.1.3 HL spectrum at 150 MHz, 34 dBm

Issue source:

Image: Booster-HL spectrum at 34 dBm

Use:

  • representative spectrum plot for Booster-HL

Status:

  • typical characterization plot

8.1.4 HL S21, 40–800 MHz

Issue source:

Image: Booster-HL S21

Use:

  • representative small-signal gain plot for Booster-HL

Status:

  • typical characterization plot

8.1.5 HL S11, 40–800 MHz

Issue source:

Image: Booster-HL S11

Use:

  • representative input return-loss plot for Booster-HL

Status:

  • typical characterization plot

8.2 Booster standard variant characterization and caveats

8.2.1 Prototype small-signal S21

Issue source:

Image: Booster prototype S21

Notes pulled from the issue:

  • small-signal S21 measurement with Pin = -20 dBm
  • gain flatness looked good on most channels
  • one channel showed poorer matching
  • gain was reported as too high for that prototype
  • the issue explicitly states this prototype result should not be considered acceptable as a production result without retuning
  • issue #335 later adds useful context from Thomas Harty that a practical target of around 30 dB gain, or perhaps 35 dB absolute maximum, would likely be sufficient in real use, especially with Urukul-driven systems

Use:

  • prototype characterization only

Status:

  • not a final production specification

8.2.2 Crosstalk measurement

Issue source:

Image: Booster crosstalk measurement

Notes from the linked source comment and associated public search snippets:

  • no strong channel-to-channel dependence of crosstalk was reported
  • below about 200 MHz, the author notes difficulty measuring it because crosstalk is reported as < 100 dB on most channels
  • the linked plot is the primary source for crosstalk / channel-isolation characterization in this document

Use:

  • typical characterization reference for channel-to-channel isolation / crosstalk
  • strong candidate for a dedicated Crosstalk / Channel Isolation subsection in the final repo document

Status:

  • characterization data from issue history/comment

8.2.3 Phase-noise notes

Issue source:

Notes from the public issue history:

  • Issue #95 exists specifically as the phase-noise tracking / documentation issue
  • in #381, Thomas Harty explicitly states that the phase noise from Booster is incredibly low
  • the same issue also notes that Booster has been used for high-fidelity quantum gates, which is a strong practical endorsement of RF quality

Interpretation:

  • these are strong public qualitative statements about practical RF quality
  • however, the currently extracted public content still does not include a directly embedded phase-noise plot in this document

Use:

  • qualitative support for a Low phase noise / demonstrated in precision AMO experiments statement
  • placeholder section awaiting direct phase-noise plots from Harty's measurements if they are recovered from issue comments or other public attachments

Status:

  • qualitative public evidence with the correct dedicated source issue linked, but still missing a hard plot-based phase-noise figure in this document

8.2.4 Stability / bistability diagnostics

Issue source:

Image: Booster bistability diagnostics

Notes from the issue history:

  • in #258, Thomas Harty reports observing a small bistability on Booster's power detectors
  • he reports operation at constant power, frequency, and phase from Urukul while logging Booster diagnostics through the VCP interface
  • the observed change is approximately 0.3 dB, with a simultaneous change in noise
  • the only correlation he reports spotting in diagnostics is that the 5 V MP voltage changes slightly at the same time
  • in #181, Harty also states that after testing, Booster v1.3 seemed to work really excellently apart from outstanding software issues

Interpretation:

  • #258 is best treated as a characterization/debug note for diagnostic stability or detector bistability, not as evidence of output-spectrum instability by itself
  • it remains a useful source because it documents a concrete stability-related observation together with a diagnostic screenshot

Use:

  • characterization note for diagnostic stability / bistability behavior
  • candidate material for a Diagnostics stability or Known behaviors subsection rather than a headline datasheet claim

Status:

  • useful stability-related figure and observation; not a standalone general RF-output stability limit without additional external-power-meter correlation

8.2.5 Harmonic content caveat

Issue source:

Images: Booster harmonic content

Comparison amplifier harmonic content

Notes pulled from the issue:

  • reported for a 150 MHz signal
  • issue states that Booster showed high harmonic content in that test
  • the issue explicitly states: "The Booster was optimized for efficiency, not for linearity."

Use:

  • important caveat for the standard variant
  • useful for explaining the Standard vs HL split

Status:

  • reported caveat

8.2.6 Product-positioning discussion

Issue source:

Use:

  • public discussion that helps justify wording such as:
  • standard Booster prioritizes efficiency and lower dissipation,
  • Booster-HL exists for better linearity

Status:

  • positioning source rather than a direct measurement plot

8.2.7 AM keying distortion

Issue source:

Image: AM keying distortion

Notes pulled from the issue:

  • approximately 0.6 dB AM distortion
  • reported at 33 dBm
  • observed during full AM keying
  • reported on two time scales
  • reported as less severe at lower powers

Use:

  • dynamic behavior caveat
  • candidate for application note or characterization section

Status:

  • reported caveat

8.2.8 Step response ringing in AOM drive chain

Issue source:

Images:

AOM optical pulse: AOM optical pulse

RF pulse out of Urukul: RF pulse out of Urukul

RF pulse out of Booster: RF pulse out of Booster

Spectrum with visible second harmonic: Booster spectrum with second harmonic

Notes pulled from the issue:

  • reported in an Urukul -> Booster -> AOM chain at 80 MHz
  • ringing observed in the optical pulse
  • ringing and asymmetry observed at Booster RF output
  • issue text mentions a second harmonic around -9 dBc in that setup
  • swapping to a Mini-Circuits amplifier reportedly removed the observed ringing in that user setup

Use:

  • application-level transient caveat
  • useful as a characterization note rather than a headline spec

Status:

  • reported caveat

9. What this document is safe to claim now

Based on the current public wiki and the selected public issues, this document can state:

  • Booster is an 8-channel RF power amplifier platform covering 40–500 MHz
  • Booster is available in:
  • a high-efficiency version,
  • a high-linearity version
  • Booster includes Ethernet monitoring/configuration, interlocks, and per-channel telemetry
  • the wiki states that Booster-HL offers second harmonic at about -40 dBc
  • public issue data for Booster-HL cover:
  • spectra at 150 MHz
  • output levels of 30 dBm, 33 dBm, and 34 dBm
  • S21 and S11 from 40 MHz to 800 MHz
  • public issue data also document important standard-version caveats and characterization related to:
  • gain versus frequency for prototype hardware
  • crosstalk / channel-to-channel isolation
  • harmonic content
  • AM keying distortion
  • ringing in some AOM use cases
  • public issue historys also provide qualitative support for very low phase noise and strong practical stability, but this document still lacks the underlying hard plots that would be needed for a formal datasheet claim
  • the RF input protection note in this document states the use of two SZNUP1301ML3T1G TVS diodes and a typical operating level of 0 dBm; final guaranteed limits should still be cross-checked against the primary design sources

10. What should still be validated before turning this into a formal datasheet

Before promoting this into a formal datasheet, the following items should be validated:

  • guaranteed output power by frequency band
  • flatness / gain tolerances across channels
  • harmonic content limits for production hardware
  • startup / pulsed / AM transient behavior
  • measurement conditions behind the wiki claim for Booster-HL second harmonic
  • direct phase-noise plots and long-term stability plots from Harty testing
  • direct crosstalk figures from the linked issue comment, if they are to be embedded locally rather than linked
  • environmental limits, cooling assumptions, and warm-up conditions
  • connectorization, power input, mechanical dimensions, and exact revision scope

11. Source Index

Wiki

Additional source / reference links

Issues used for measurement and characterization

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