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|introduced=1987  
|introduced=1987  
|discontinued=(?)  
|discontinued=(?)  
|designers=
|designers=Murlan Kaufman;Cliff Baker
|manuals=
|manuals=
* [[Media:070-5922-01.pdf|11A32 Manual]]
* [[Media:070-5922-01.pdf|11A32 Manual]]
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* [[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]] and DSA600-series scopes.


{{BeginSpecs}}
{{BeginSpecs}}
{{Spec | Bandwidth  | DC to 400 MHz.  100 MHz and 20 MHz four pole BWL (Bandwidth Limit) filters may be selected.}}
{{Spec | Bandwidth  | DC to 400 MHz; selectable 100 MHz / 20 MHz 4-pole BWL (Bandwidth Limit) filter }}
{{Spec | Rise time  | 875 ps in 1 GHz mainframes such as the [[11402]], [[11402|11402A]], [[11403]], [[11403|11403A]], [[DSA600|DSA601A]], or [[DSA600|DSA602A]]}}
{{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 | Deflection | 1 mV to 10 V per division in 1% calibrated steps}}
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==Internals==
==Internals==
===Analog===
===Analog===
Each input channel has a separate attenuator module containing an [[M474]] buffer amplifier.
Each input channel has a separate attenuator module, part number [[119-2000-0x]],
The attenuator output feeds an [[M377]] amplifier IC, one per input channel.
containing passive 1 MΩ attenuators, a 50 Ω termination resistor, an AC coupling capacitor,
a switch selecting the calibrator or signal input, and an [[M474]] buffer amplifier.  
In normal operation the calibrator signal to the attenuator is instead connected to ground.


The display outputs of the two M377s are hard-wired in parallel and drive the mainframe’s
The attenuator module output feeds the + input of the [[M377]] amplifier IC through a (blue) 50 Ω transmission line, one per input channel.  The cable lengths set a standard delay per plugin.
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.
The M377's − input is connected to the [[ACVS]] (Analog Control Voltage System) output.


When not enabled, each M377 differential output is exactly zero by design.  
The (differential) display outputs of the two amplifiers are hard-wired in parallel and drive the mainframe’s
This fact is used during calibration by the plugin’s firmware to determine the mainframe’s imbalance and compensate for it during normal operation.
50 Ω per side input impedance. The same is true of the trigger outputs of the two amplifiers.


The version of the M377 used in the 11A32 has a 100 Ω output impedance per side so that two of them in parallel create a source impedance of 50 Ω per side.
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.
Each of the two channels has its own AUX output on dedicated pins of the plug-in interface connector:
{| class="wikitable" style="margin:auto"
|-
! signal name !! positive pin number !! negative pin number
|-
| AUX 1 || B38 || B37
|-
| AUX 2 || A36 || A35
|-
|}
See also the block diagram below.
See also the block diagram below.


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The 11A32 and the [[11A34]] use exactly the same firmware.
The 11A32 and the [[11A34]] use exactly the same firmware.


The 11A32 and [[11A34]] were originally intended to use [[Intel 8052]] microcontrollers.
The [[11A34]] and 11A32 were originally intended to use [[Intel 8052]] microcontrollers.  
However, during development, the firmware swelled beyond that chip's 8192-byte maximum  
However, during development, the firmware swelled beyond that chip's 8192-byte maximum on-chip  
on-chip ROM size. [[Doug Haines]] found an alternate supplier of 8051-compatible chips
ROM size. [[Doug Haines]] found an alternate supplier of 8051-compatible chips (OKI Semiconductor)
(OKI Semiconductor) that offered a 16Kbyte on-chip ROM, and that's what the plug-ins  
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.
wound up with. The finished code size wound up at about 14 KB.
 
The 11A32 also contains a Dallas Semiconductor DS1220Y NVRAM storing last settings, calibration constants, and instrument serial number. 
The DS1220Y contains a battery with a typical life time of 20-30 years. 
 
There is also an [[ACVS]] (Analog Control Voltage System) sample and hold module on a daughter board that generates the analog voltages needed for gain and offset, including error correction
under microcontroller firmware control. 
 
The microcontroller also provides the digital signals sent to the M377 amplifier, setting one of its six fixed gains, one of its three bandwidths, turning on or off its selected output, and each output's normal or invert state.


The 11A32 also contains a DS1120 NVRAM and an [[ACVS]] module that generates the analog control voltages needed for gain/offset control etc.
Digital mainframes do waveform manipulation (addition, subtraction, multiplication, etc.).  Consequently only one 11A32 output is on at a time.  Analog mainframes however allow more than one channel to be on at a time.  This allows the plugin channels to be added or subtracted in the plugin.


==Links==
==Links==
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* [[11A-series plug-in NVRAM replacement]]
* [[11A-series plug-in NVRAM replacement]]
* [http://www.barrytech.com/tektronix/tek11000/tek11a32.html Tek 11A32 @ barrytech.com]
* [http://www.barrytech.com/tektronix/tek11000/tek11a32.html Tek 11A32 @ barrytech.com]
{{Documents|Link=11A32}}


==Pictures==
==Pictures==
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Tek 11a32 2.jpg
Tek 11a32 2.jpg
Tek 11a32 block diagram.png|Block diagram
Tek 11a32 block diagram.png|Block diagram
Tektronix 11A32 schematic pg 2 stitch.jpg|11A32 Main Board Schematic
Tek 11a32 input attenuators.jpg|11A32 Input Attenuators
Tek 11a32 kernel.jpg|11A32 Kernel
Tek 11a32 analog control and signal amplifiers.jpg|11A32 Analog Control and Signal Amplifiers
Tektronix 11A32 schematic pg 4.jpg|11A32 Main Interface
Tektronix 11A32 schematic pg 4.jpg|11A32 Main Interface
Tek 11a32 internal1.jpg|left side internal
Tek 11a32 internal1.jpg|left side internal
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</gallery>
</gallery>


{{Custom ICs|11A32}}
==Parts==
{{Parts|11A32}}


[[Category:11000 series plugins]]
[[Category:11000 series plugins]]
[[Category:Tekprobe BNC]]
[[Category:Tekprobe BNC]]
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