11A32: Difference between revisions
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* [[Media:070-5922-01.pdf|11A32 | * [[Media:070-5922-01.pdf|11A32 Manual]] | ||
* [[Media:070-6782-00.pdf|11A32 Service Reference]] | * [[Media:070-6782-00.pdf|11A32 Service Reference]] | ||
* [[Media:070-7388-99.pdf|11A32 Extended Service Manual]] ( | * [[Media:070-7388-99.pdf|11A32 Extended Service Manual]] (OCR, with schematics) | ||
* [[Media:Tektronix 11k plugin NVRAM replacement.pdf|Tektronix 11k Plug-in NVRAM Replacement | * [[Media:Tektronix 11k plugin NVRAM replacement.pdf|Tektronix 11k Plug-in NVRAM Replacement]] | ||
* [[Media:061-3381-00.pdf|Tektronix 11A32 Preliminary Service Manual | * [[Media:061-3381-00.pdf|Tektronix 11A32 Preliminary Service Manual]]] | ||
}} | }} | ||
The '''Tektronix 11A32''' is a 400 MHz dual-channel amplifier plug-in for [[11000-series scopes]]. | The '''Tektronix 11A32''' is a 400 MHz dual-channel amplifier plug-in for [[11000-series scopes]]. | ||
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==Internals== | ==Internals== | ||
===Analog=== | ===Analog=== | ||
Each input channel has a separate attenuator | Each input channel has a separate attenuator module containing an [[M474]] buffer amplifier. | ||
The attenuator output feeds an [[M377]] amplifier IC, one per input channel. | |||
The display outputs of the two M377s are hard-wired in parallel and drive the mainframe’s | The display outputs of the two M377s are hard-wired in parallel and drive the mainframe’s | ||
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wound up with. The finished code size wound up at about 14 KB. | wound up with. The finished code size wound up at about 14 KB. | ||
The 11A32 also contains a DS1120 NVRAM and an [[ACVS]] | The 11A32 also contains a DS1120 NVRAM and an [[ACVS]] module that generates the analog control voltages needed for gain/offset control etc. | ||
==Links== | ==Links== | ||
Revision as of 04:49, 31 December 2022
The Tektronix 11A32 is a 400 MHz dual-channel amplifier plug-in for 11000-series scopes.
Key Specifications
| Bandwidth | DC to 400 MHz; 100 MHz and 20 MHz BWL filters |
|---|---|
| Rise time | 875 ps in 1 GHz mainframes such as the 11402, 11402A, 11403, 11403A, DSA601A, or DSA602A |
| Deflection | 1 mV to 10 V per division in 1% calibrated steps |
| Input impedance | 50 Ω or 1 MΩ |
| Features |
|
Internals
Analog
Each input channel has a separate attenuator module containing an M474 buffer amplifier. The attenuator output feeds an M377 amplifier IC, one per input channel.
The display outputs of the two M377s are hard-wired in parallel and drive the mainframe’s 50 Ω input impedance. The same is true of the trigger outputs of the two amplifiers. The version of the M377 used in the 11A32 has 100 Ω output impedance so that two of them in parallel create a source impedance of 50 Ω.
Each M377 amplifier's nominal common-mode output voltage is zero whether enabled or not.
When not enabled, each M377 differential output is exactly zero by design. This fact is used during calibration by the plugin’s firmware to determine the mainframe’s imbalance and compensate for it during normal operation.
See also the block diagram below.
Digital
The 11A32 and the 11A34 use exactly the same firmware.
The 11A32 and 11A34 were originally intended to use Intel 8052 microcontrollers. However, during development, the firmware swelled beyond that chip's 8192-byte maximum on-chip ROM size. Doug Haines found an alternate supplier of 8051-compatible chips (OKI Semiconductor) that offered a 16Kbyte on-chip ROM, and that's what the plug-ins wound up with. The finished code size wound up at about 14 KB.
The 11A32 also contains a DS1120 NVRAM and an ACVS module that generates the analog control voltages needed for gain/offset control etc.
Links
Pictures
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Block diagram
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11A32 Main Board Schematic
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11A32 Main Interface
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left side internal
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right side internal
Custom ICs used in the 11A32
| Page | Model | Part nos | Description | Designers | Used in |
|---|---|---|---|---|---|
| M377 | M377 | 165-2129-03 • 165-2089-06 • 155-2089-05 | amplifier | John Addis | 11A16 • 11A32 • 11A33 • 11A34 • 11A52 • 2245 • 2245A • 2247 • 2247A • 2252 • TDS410 • TDS420 • TDS460 • TDS520D • TDS540D • TDS580D • TDS680C • TDS684C • TDS714L • TDS724D • TDS754D • TDS784D |
| M474 | M474 | amplifier | John Addis • Ivan John Cousins | 11A32 • 11A34 |