11A32: Difference between revisions

11A32 (view source)

Revision as of 05:45, 31 December 2022

90 bytes removed , 31 December 2022

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 The '''Tektronix 11A32''' is a 400 MHz dual-channel amplifier plug-in for [[11000-series scopes]].
-Each of the attenuator modules contains an [[M474]] buffer amplifier.
-Each of the attenuator modules feeds an [[M377]] amplifier IC.
-The output signals of the two M377s combine at the output of the 11A32.
-The fine steps between the deflection ranges are calibrated in 1% increments.
-The 11A32 and the [[11A34]] use exactly the same firmware.
+{{BeginSpecs}}
+{{Spec | Bandwidth  | DC to 400 MHz; 100 MHz and 20 MHz BWL filters }}
+{{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 | 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}}
+==Internals==
+===Analog===
+Each input channel has a separate attenuator modules containing an [[M474]] buffer amplifier,
+feeding an [[M377]] amplifier IC, one per input channel.
-Each of the 11A32’s two channels has its own M377 amplifier.
+The display outputs of the two M377s are hard-wired in parallel and drive the mainframe’s
-The display outputs of the two amplifiers are hard wired in parallel and drive the mainframe’s 50 Ω input impedance.
+Ω input impedance.  The same is true of the trigger outputs of the two amplifiers.
-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.
-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.
-See the block diagram below.
-{{BeginSpecs}}
+See also the block diagram below.
-{{Spec | Bandwidth  | DC to 400 MHz plus 100 MHz and 20 MHz BWL filters }}
-{{Spec | Rise time  | 875 ps in 1 GHz mainframe such as the [[11402]], [[11402|11402A]], [[11403]], [[11403|11403A]], [[DSA600|DSA601A]], or [[DSA600|DSA602A]]}}
+===Digital===
-{{Spec | Deflection | 1 mV to 10 V per division in 1% calibrated steps}}
+The 11A32 and the [[11A34]] use exactly the same firmware.
-{{Spec | Input impedance | 50 Ω or 1 MΩ }}
-{{Spec | Features |
-* High-Resolution Calibrated DC Offset
-* Fast Overdrive Recovery
-* 50 Ω mode: 5 V RMS overload protected with manual reset
-}}
-{{EndSpecs}}
-==Internals==
 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
-[[Doug Haines]] found an alternate supplier of 8051-compatible chips (OKI Semiconductor) that offered a 16Kbyte on-chip ROM,
+on-chip ROM size. [[Doug Haines]] found an alternate supplier of 8051-compatible chips
-and that's what the plug-ins wound up with. The finished code size wound up at about 14 KB.
+(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 11A32 also contains a DS1120 NVRAM and an [[ACVS]] sample and hold module.
+The 11A32 also contains a DS1120 NVRAM and an [[ACVS]]  module that generates the analog control voltages needed for gain/offset control etc.
 ==Links==