11A34: Difference between revisions

Latest revision as of 09:22, 22 September 2024

Tektronix 11A34

Quad channel 300 MHz amplifier

Produced from 1987 to (?)

Manuals

ROM Images

File	Pos.	Checksum
160-4009-04	U700	3e2de25b
160-4009-08	U700	8c2d1027

(All manuals in PDF format unless noted otherwise)

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 version for video applications, the 11A34V, that was introduced in 1991 (see also 11T5H). It differs from the 11A34 only in its input impedance (75 ohms). 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 four pole BWL (Bandwidth Limit) 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	High-resolution calibrated DC offset Fast overdrive recovery 5 V_RMS input overload protection in 50 Ω mode, with manual reset

Internals

Analog

Each input channel has a separate 119-2000-0x attenuator module containing passive 1 MΩ attenuators, an AC coupling capacitor, a switch selecting the calibrator or signal input, and an M474 buffer amplifier. The calibrator signal is turned off inside the plugin when not in use.

The attenuator module output feeds the non-inverting 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.

The M377's inverting input is connected to the ACVS (Analog Control Voltage System) output.

The (differential) display outputs of the four amplifiers are hard-wired in parallel and drive the mainframe’s 50 Ω per side input impedance. The same is true of the trigger outputs of the four amplifiers.

The version of the M377 used in the 11A34 has a 200 Ω output impedance per side 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 differential signal with a 200 Ω source impedance per side. External (on the circuit board) 66.5 Ω shunt resistors on each AUX output bring this down to the 50 Ω source impedance specified by the 11k plug-in interface.

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 16 KByte on-chip ROM, and that's what the plug-ins wound up with. The finished code size is about 14 KB.

The 11A34 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 are also two ACVS (Analog Control Voltage System) sample and hold modules on two daughter boards that generate 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 + up or invert state.

Digital mainframes do waveform manipulation (addition, subtraction, multiplication, etc.). Consequently only one 11A34 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

11A-series plug-in NVRAM replacement

Documents Referencing 11A34

Document	Class	Title	Authors	Year	Links
Electronic-Engineering-Aug-Sept-1988-Versatile-Analogue-Chip-John-Addis.pdf	Article	Versatile Analogue Chip for Oscilloscope Plug-ins	John Addis	1988	M377 • 11A32 • 11A33 • 11A34 • 11A52 • Cascomp • Overdrive • Thermals • Gilbert multiplier • Pat Quinn • Gary Polhemus • Art Metz

Pictures

11A34 front view
front view
left side view
right side view
bottom view
Block diagram
Input Attenuators
Kernel
Analog Control and Signal Amplifiers
Main Interface
11A34V and 11T5H
11A34V and 11T5H
Prototype 11A34
Prototype 11A34
Prototype 11A34
Prototype 11A34
11A34V front
11A34V rear
11A34V left internal
11A34V right internal
11A34

Parts

Some Parts Used in the 11A34

Part	Part Number(s)	Class	Description	Used in
Intel 8051		Monolithic integrated circuit	8-bit microcontroller	11A32 • 11A34 • WFM300
M377	165-2129-03 • 165-2089-06 • 155-2089-05	Monolithic integrated circuit	amplifier	11A16 • 11A32 • 11A33 • 11A34 • 11A52 • 2245 • 2245A • 2247 • 2247A • 2252 • TDS410 • TDS420 • TDS460 • TDS520D • TDS540D • TDS580D • TDS680C • TDS684C • TDS714L • TDS724D • TDS754D • TDS784D
M474		Monolithic integrated circuit	amplifier	11A32 • 11A34

@@ Line 8: / Line 8: @@
 |introduced=1987
 |discontinued=(?)
-|designers=Murlan Kaufman
+|designers=Murlan Kaufman;Cliff Baker
 |manuals=
-* [http://w140.com/tek_11a34_user.pdf Tektronix 11A34 User Manual (PDF)]
+* [[Media:070-5921-01.pdf|Tektronix 11A34 User Reference -01]]
-* [http://w140.com/Tek11A34-service.pdf Tektronix 11A34 Service Manual (PDF)]
+* [[Media:070-5921-00.pdf|Tektronix 11A34 User Reference -00]]
-* [[Media:070-7389-99.pdf|Tektronix 11A34 Extended Service Manual (PDF)]]
+* [[Media:070-6785-00.pdf|Tektronix 11A34 Service Manual]]
-* [[Media:Tektronix 11k plugin NVRAM replacement.pdf|Tektronix 11k Plug-in NVRAM Replacement (PDF)]]
+* [[Media:070-7389-99.pdf|Tektronix 11A34 Extended Service Manual]]
+* [[Media:Tektronix 11k plugin NVRAM replacement.pdf|Tektronix 11k Plug-in NVRAM Replacement]]
+{{ROM Images}}
 }}
 The '''Tektronix 11A34''' is a four-channel vertical amplifier plug-in for [[11000-series_scopes|11000-series]] and DSA600-series scopes.
-It uses four [[M377]] amplifier chips. It contains two [[ACVS]] sample and hold modules.
 Option 23 added four [[P6134]] probes.
-There is also a later version, the 11A34V introduced in 1991, for video applications.
+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]]. (See also [[11T5H]].) ''more Information needed''
+It differs from the 11A34 only in its input impedance (75 ohms). Development of the 11A34V was managed by [[Murlan Kaufman]].
+: ''more information about 11A34V needed''
-The 11A34 uses the same firmware as the [[11A32]].
 {{BeginSpecs}}
-{{Spec | Bandwidth | DC to 300 MHz plus 100 MHz and 20 MHz BWL filters }}
+{{Spec | Bandwidth | DC to 300 MHz.  100 MHz and 20 MHz four pole BWL (Bandwidth Limit) filters may be selected.}}
-{{Spec | Number of Inputs | 4 }}
+{{Spec | Rise time | 1.2 ns in 1 GHz mainframe such as the [[11402]], [[11402|11402A]], [[11403]], [[11403|11403A]], [[DSA600|DSA601A]], or [[DSA600|DSA602A]] }}
-{{Spec | Rise time | 1.2 ns in 1 GHz mainframe such as the [[11402]], [[11402|11402A]]. [[11403]], [[11403|11403A]], [[DSA600|DSA601A]], or [[DSA600|DSA602A]] }}
+{{Spec | Deflection | 1 mV to 10 V/div in 1% calibrated steps}}
-{{Spec | Deflection | 1 mV to 10V per division in 1% calibrated steps}}
 {{Spec | Input impedance | 50 Ω or 1 MΩ }}
 {{Spec | Features |
-*High-Resolution Calibrated DC Offset
+* High-resolution calibrated DC offset
-*Fast Overdrive Recovery
+* Fast overdrive recovery
-*50 Ω mode 5 V RMS overload protected with manual reset
+* 5 V<sub>RMS</sub> input overload protection in 50 Ω mode, with manual reset
 }}
 {{EndSpecs}}
+==Internals==
+===Analog===
+Each input channel has a separate [[119-2000-0x]] attenuator module containing passive 1 MΩ attenuators, an AC coupling capacitor,
+a switch selecting the calibrator or signal input, and an [[M474]] buffer amplifier. The calibrator signal is turned off inside the plugin when not in use.
+The attenuator module output feeds the non-inverting 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.
+The M377's inverting input is connected to the [[ACVS]] (Analog Control Voltage System) output.
+The (differential) display outputs of the four amplifiers are hard-wired in parallel and drive the mainframe’s 50 Ω per side input impedance.  The same is true of the trigger outputs of the four amplifiers.
+The version of the M377 used in the 11A34 has a 200 Ω output impedance per side 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:
+{| class="wikitable" style="margin:auto"
+|-
+! 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 differential signal with a 200 Ω source impedance per side.
+External (on the circuit board) 66.5 Ω shunt resistors on each AUX output bring 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 16 KByte on-chip ROM, and that's what the plug-ins wound up with. The finished code size is about 14 KB.
+The 11A34 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 are also two [[ACVS]] (Analog Control Voltage System) sample and hold modules on two daughter boards that generate 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 + up or invert state.
+Digital mainframes do waveform manipulation (addition, subtraction, multiplication, etc.).  Consequently only one 11A34 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==
 * [[11A-series plug-in NVRAM replacement]]
-* [http://www.barrytech.com/tektronix/tek11000/tek11a34.html Tek 11A34 @ barrytech.com]
+{{Documents|Link=11A34}}
+{{PatentLinks|11A34}}
 ==Pictures==
 <gallery>
-Tek 11a34 front.jpg
+Tek 11a34 front.jpg | 11A34 front view
 a34_front.jpg|front view
 a34_left2.jpg|left side view
 a34_right.jpg|right side view
 a34_bottom.jpg|bottom view
+Tek 11a34 block diagram.png|Block diagram
+Tek 11a34 input attenuators.jpg|Input Attenuators
+Tek 11a34 kernel.jpg|Kernel
+Tek 11A34 analog control and signal amplifiers.png|Analog Control and Signal Amplifiers
+Tek 11a34 main interface.jpg|Main Interface
 Tek_11a34v_and_11t5h.jpg|11A34V and 11T5H
 Tek_11a34v_and_11t5h_2.jpg|11A34V and 11T5H
@@ Line 62: / Line 119: @@
 </gallery>
-{{Custom ICs|11A34}}
+==Parts==
+{{Parts|11A34}}
 [[Category:11000 series plugins]]
 [[Category:Tekprobe BNC]]