11A34: Difference between revisions

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Each of the attenuator modules drives an [[M377]] amplifier IC.
Each of the attenuator modules drives an [[M377]] amplifier IC.


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 ROM size.  
[[Doug Haines]] found an alternate supplier of 8051-compatible chips (OKI Semiconductor) that offered a 16Kbyte on-chip ROM,  
[[Doug Haines]] found an alternate supplier of 8051-compatible chips (OKI Semiconductor) that offered a 16Kbyte on-chip ROM,  

Revision as of 10:05, 25 December 2022

Tektronix 11A34
Quad channel 300 MHz amplifier
Tek 11A34

Compatible with 11000-series scopes

Produced from 1987 to (?)

Manuals
Manuals – Specifications – Links – Pictures

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 uses the same firmware as the 11A32.

Each of the four channels has its own M377 amplifier. The display outputs of the four amplifiers are combined in parallel and drive the 50 Ω impedance of the mainframe. 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 an equivalent source impedance of 50 Ω. The amplifiers can be connected in parallel because regardless of whether the amplifier's output is enabled:

  • each amplifier's output has a source impedance of 200 Ω so the two amplifiers in parallel match the 50 Ω spec of the 11000 Series plug-in interface.
  • each amplifier's nominal common-mode output voltage is zero
  • each amplifier's nominal differential output voltage is zero

See the block diagram below.

Key Specifications

Bandwidth DC to 300 MHz, 100 MHz and 20 MHz BWL filters
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
  • High-Resolution Calibrated DC Offset
  • Fast Overdrive Recovery
  • 50 Ω mode: 5 V RMS overload protected with manual reset

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.

Pictures

Custom ICs used in the 11A34

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