11A34: Difference between revisions
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Option 23 added four [[P6134]] probes. | Option 23 added four [[P6134]] probes. | ||
There is also a | There is also a version for video applications, the 11A34V, that was introduced in 1991 | ||
Development of the 11A34V was managed by [[Murlan Kaufman]]. | (see also [[11T5H]]). Development of the 11A34V was managed by [[Murlan Kaufman]]. | ||
: ''more information about 11A34V needed'' | |||
{{BeginSpecs}} | |||
Each of the | {{Spec | Bandwidth | DC to 300 MHz, 100 MHz and 20 MHz BWL filters may be selected.}} | ||
The display outputs of the four amplifiers are hard wired in parallel and drive the mainframe’s 50 Ω input impedance. | {{Spec | Rise time | 1.2 ns in 1 GHz mainframe such as the [[11402]], [[11402|11402A]], [[11403]], [[11403|11403A]], [[DSA600|DSA601A]], or [[DSA600|DSA602A]] }} | ||
The same is true of the trigger outputs of the four amplifiers. | {{Spec | Deflection | 1 mV to 10 V/div 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}} | |||
==Links== | |||
* [[11A-series plug-in NVRAM replacement]] | |||
* [http://www.barrytech.com/tektronix/tek11000/tek11a34.html Tek 11A34 @ barrytech.com] | |||
==Internals== | |||
===Analog=== | |||
Each channel's attenuator module contains an [[M474]] buffer amplifier. | |||
Each of the attenuator modules drives an [[M377]] amplifier IC, one per input channel. | |||
The display outputs of the four amplifiers are hard-wired in parallel and drive the mainframe’s | |||
50 Ω input impedance. The same is true of the trigger outputs of the four amplifiers. | |||
The version of the M377 used in the 11A34 has 200 Ω output impedance so that four of them in parallel create a source impedance of 50 Ω. | The version of the M377 used in the 11A34 has 200 Ω output impedance so that four 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. | ||
Each of the four channels has its own AUX output on dedicated pins of the plug-in interface connector: | |||
{| class="wikitable" style="margin:auto" | {| class="wikitable" style="margin:auto" | ||
|- | |- | ||
! signal name !! positive pin number !! negative pin number | ! signal name !! positive pin number !! negative pin number | ||
Line 50: | Line 67: | ||
| AUX 4 || A32 || A31 | | AUX 4 || A32 || A31 | ||
|} | |} | ||
The AUX signals emerge from each M377 amplifier as 200 Ω source impedance. | |||
An external 66.5 Ω shunt resistor on each AUX output (on the circuit board) | |||
brings this down to the 50 Ω source impedance specified by the 11k plug-in interface. | |||
See also the block diagram below. | |||
== | ===Digital=== | ||
The 11A34 and the [[11A32]] use exactly the same firmware. | |||
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 on-chip | ||
[[Doug Haines]] found an alternate supplier of 8051-compatible chips (OKI Semiconductor) that offered a 16Kbyte on-chip ROM, | ROM size. [[Doug Haines]] found an alternate supplier of 8051-compatible chips (OKI Semiconductor) | ||
and that's what the plug-ins wound up with. The finished code size wound up at about 14 KB | 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 | The 11A34 contains two [[ACVS]] modules to generate the analog control voltages needed for gain/offset control etc. | ||
==Pictures== | ==Pictures== |
Revision as of 05:35, 31 December 2022
The Tektronix 11A34 is a four-channel vertical amplifier plug-in for 11000-series and DSA600-series scopes.
Option 23 added four P6134 probes.
There is also a version for video applications, the 11A34V, that was introduced in 1991 (see also 11T5H). Development of the 11A34V was managed by Murlan Kaufman.
- more information about 11A34V needed
Key Specifications
Bandwidth | DC to 300 MHz, 100 MHz and 20 MHz BWL filters may be selected. |
---|---|
Rise time | 1.2 ns in 1 GHz mainframe such as the 11402, 11402A, 11403, 11403A, DSA601A, or DSA602A |
Deflection | 1 mV to 10 V/div in 1% calibrated steps |
Input impedance | 50 Ω or 1 MΩ |
Features |
|
Links
Internals
Analog
Each channel's attenuator module contains an M474 buffer amplifier. Each of the attenuator modules drives an M377 amplifier IC, one per input channel.
The display outputs of the four amplifiers are hard-wired in parallel and drive the mainframe’s 50 Ω input impedance. The same is true of the trigger outputs of the four amplifiers. The version of the M377 used in the 11A34 has 200 Ω output impedance so that four 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.
Each of the four channels has its own AUX output on dedicated pins of the plug-in interface connector:
signal name | positive pin number | negative pin number |
---|---|---|
AUX 1 | B38 | B37 |
AUX 2 | A36 | A35 |
AUX 3 | B32 | B33 |
AUX 4 | A32 | A31 |
The AUX signals emerge from each M377 amplifier as 200 Ω source impedance. An external 66.5 Ω shunt resistor on each AUX output (on the circuit board) brings this down to the 50 Ω source impedance specified by the 11k plug-in interface.
See also the block diagram below.
Digital
The 11A34 and the 11A32 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 11A34 contains two ACVS modules to generate the analog control voltages needed for gain/offset control etc.
Pictures
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front view
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left side view
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right side view
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bottom view
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Block diagram
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Analog Control and Signal Amplifiers
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11A34V and 11T5H
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11A34V and 11T5H
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Prototype 11A34
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Prototype 11A34
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Prototype 11A34
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Prototype 11A34
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11A34V front
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11A34V rear
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11A34V left internal
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11A34V right internal
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11A34
Custom ICs used in the 11A34
Page | Model | Part nos | Description | Designers | Used in |
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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 |