11A34
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 later version, the 11A34V introduced in 1991, for video applications. Development of the 11A34V was managed by Murlan Kaufman. (See also 11T5H.) more Information needed
The 11A34 and the 11A32 use exactly the same firmware. Each of the 11A34’s four channels has its own M377 amplifier. 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.
See the block diagram below.
Each of the four channels has its own AUX output that is sent across the plug-in interface connector.
signal name | positive pin number | negative pin number |
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AUX 1 | B38 | B37 |
AUX 2 | A36 | A35 |
AUX 3 | B32 | B33 |
AUX 4 | A32 | A31 |
Key Specifications
Bandwidth | DC to 300 MHz, 100 MHz and 20 MHz BWL filters may be selected. |
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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 |
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Links
Internals
Each channel's attenuator module contains an M474 buffer amplifier. Each of the attenuator modules drives an M377 amplifier IC.
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 sample and hold modules.
The AUX signals emerge from each M377 amplifier as 200 Ω source impedance. A external (on the board) 66.5 ohm shunt resistor on each AUX output forms the 50 Ω source impedance specified by the 11k plug-in interface.
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 |