11A32: Difference between revisions

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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]].
Each of the attenuator modules contains an [[M474]] buffer amplifier.
Each of the attenuator modules feeds an [[M377]] amplifier IC.
The output signals of the two M377s combine at the output of the 11A32.
The fine steps between the deflection ranges are calibrated in 1% increments.


The 11A32 and the [[11A34]] use exactly the same firmware.
{{BeginSpecs}}
{{Spec | Bandwidth  | DC to 400 MHz; 100 MHz and 20 MHz BWL filters }}
{{Spec | Rise time  | 875 ps in 1 GHz mainframes such as the [[11402]], [[11402|11402A]], [[11403]], [[11403|11403A]], [[DSA600|DSA601A]], or [[DSA600|DSA602A]]}}
{{Spec | Deflection | 1 mV to 10 V per division in 1% calibrated steps}}
{{Spec | Input impedance | 50 Ω or 1 MΩ }}
{{Spec | Features |
* High-resolution calibrated DC offset
* Fast overdrive recovery
* 5 V<sub>RMS</sub> overload protection in 50 Ω mode, with manual reset
}}
{{EndSpecs}}
 
==Internals==
===Analog===
Each input channel has a separate attenuator modules containing an [[M474]] buffer amplifier,
feeding an [[M377]] amplifier IC, one per input channel.


Each of the 11A32’s two channels has its own M377 amplifier.
The display outputs of the two M377s are hard-wired in parallel and drive the mainframe’s  
The display outputs of the two amplifiers are hard wired in parallel and drive the mainframe’s 50 Ω input impedance.  
50 Ω input impedance. The same is true of the trigger outputs of the two amplifiers.  
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.
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.
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.  
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.
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 the block diagram below.


{{BeginSpecs}}
See also the block diagram below.
{{Spec | Bandwidth  | DC to 400 MHz plus 100 MHz and 20 MHz BWL filters }}
 
{{Spec | Rise time  | 875 ps in 1 GHz mainframe such as the [[11402]], [[11402|11402A]], [[11403]], [[11403|11403A]], [[DSA600|DSA601A]], or [[DSA600|DSA602A]]}}
===Digital===
{{Spec | Deflection | 1 mV to 10 V per division in 1% calibrated steps}}
The 11A32 and the [[11A34]] use exactly the same firmware.
{{Spec | Input impedance | 50 Ω or 1 MΩ }}
{{Spec | Features |
* High-Resolution Calibrated DC Offset
* Fast Overdrive Recovery
* 50 Ω mode: 5 V RMS overload protected with manual reset
}}
{{EndSpecs}}


==Internals==
The 11A32 and [[11A34]] were originally intended to use [[Intel 8052]] microcontrollers.
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.
However, during development, the firmware swelled beyond that chip's 8192-byte maximum  
[[Doug Haines]] found an alternate supplier of 8051-compatible chips (OKI Semiconductor) that offered a 16Kbyte on-chip ROM,  
on-chip ROM size. [[Doug Haines]] found an alternate supplier of 8051-compatible chips
and that's what the plug-ins wound up with. The finished code size wound up at about 14 KB.
(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]] sample and hold module.
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 05:45, 31 December 2022

Tektronix 11A32
400 MHz dual channel vertical plug-in
Tektronix 11A32

Compatible with 11000-series scopes

Produced from 1987 to (?)

Manuals
Manuals – Specifications – Links – Pictures

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
  • High-resolution calibrated DC offset
  • Fast overdrive recovery
  • 5 VRMS overload protection in 50 Ω mode, with manual reset

Internals

Analog

Each input channel has a separate attenuator modules containing an M474 buffer amplifier, feeding 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

  • Block diagram

    Block diagram

  • 11A32 Main Board Schematic

    11A32 Main Board Schematic

  • 11A32 Main Interface

    11A32 Main Interface

  • left side internal

    left side internal

  • right side internal

    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
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