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The 7A22 is a single channel differential vertical amplifier for the 7000 series mainframes, produced from about 1969 to 2000.   
{{Plugin Sidebar
|manufacturer=Tektronix
|series=7000-series scopes
|type=7A22
|summary=1 MHz differential amplifier
|image=tek-7a22-front.jpg
|caption=7A22 front view
|introduced=1969
|discontinued=1991
|designers=Val Garuts
|manuals=
* [[Media:070-0931-00.pdf|Tektronix 7A22 Manual]] (OCR)
* [http://bama.edebris.com/download/tek/7a22(2)/tek-7a22.pdf Tektronix 7A22 Manual @ BAMA]
* [[Media:TM-11-6625-2749-14&P.pdf| TM-11-6625-2749-14&P - 7A22 military manual]]
* [[Media:TB-9-6625-2132-35.pdf | TB 9-6625-2132-35 Calibration Procedure for AM-6881/U (7A13) and AM-6786/U (7A22)]]
}}
The '''Tektronix 7A22''' is a single channel differential vertical amplifier for the [[7000-series scopes|7000 series mainframes]], designed by [[Val Garuts]] and produced from about 1969 to 1991.  Specifications and controls are similar to the [[26A2]] and the [[3A9]] from the 560 series but without current probe input nor front panel signal output.


Remarkably, the 7A22's input sensitivity reaches down to 10 μV/div.  Bandwidth is 1 MHz, the upper 3dB limit can be reduced in ×3 steps down to 100 Hz (to eliminate noise, inter alia), and the lower bandwidth can be raised in ×10 steps from 0.1 Hz to 10 kHz.  A separate control optionally supplies an internal DC voltage to offset the DC signal component.  Even in the most sensitive ranges (10 μV/div to 10 mV/div), common-mode voltage can be ±10 V.  Input resistance is 1 MΩ but for high source resistance DC coupled measurements, one can disconnect the internal gate return resistors of the input FETs, at the cost of disabling the 20mv/div and higher ranges.
The 7A22's input sensitivity reaches down to 10 μV/Div.  Bandwidth is 1 MHz, the upper 3 dB limit can be reduced in ×3 steps down to 100 Hz (to eliminate noise, inter alia), and the lower bandwidth can be raised in ×10 steps from 0.1 Hz to 10 kHz.  A separate control optionally supplies an internal DC voltage to offset the DC signal component.  Even in the most sensitive ranges (10 μV/Div to 10 mV/Div), common-mode voltage can be ±10 V.  Input resistance is 1 MΩ, but for high source resistance DC coupled measurements, one can disconnect the internal gate return resistors of the input FETs, at the disadvantage of disabling the 20 mV/div and higher ranges.


Applications include audio, biological signals, etc.
Applications include audio, biological signals, sensors etc.


An example application is found in Jim Williams' [http://cds.linear.com/docs/en/application-note/an124f.pdf Application Note 124] – see Appendix D for a comparison of differential amplifiers.
An example application is found in [[Jim Williams]]' [http://cds.linear.com/docs/en/application-note/an124f.pdf LT Application Note 124] – see Appendix D for a comparison of differential amplifiers.


==Manuals==
{{BeginSpecs}}
{{Spec | Bandwidth | 1 MHz, LF limit switchable DC, 0.1 Hz to 10 kHz in ×10 steps, HF limit switchable 100 Hz to 1 MHz in ×3/×10 steps}}
{{Spec | Deflection | 10 μV/Div to 10 V/Div in 1–2–5 sequence }}
{{Spec | Input impedance | 1 MΩ // 47 pF (either input) }}
{{Spec | Signal ranges | }}
{| class="wikitable" border=1 style="margin-left: 8em;" |
!Range
! Differential signal
! DC Offset
! Common mode
|-
| 10 μV/Div to 10 mV/Div || ±1 V    || ±1 V    || ±10 V
|-
| 20 mV/Div to 0.1 V/Div || ±10 V  || ±10 V    || ±100 V
|-
| 0.2 V/Div to 1 V/Div  || ±100 V  || ±100 V  || ±500 V
|-
| 2 V/Div to 10 V/Div    || ±1000 V || ±1000 V  || ±500 V
|-
|}
{{EndSpecs}}


* [http://bama.edebris.com/download/tek/7a22(2)/tek-7a22.pdf Tektronix 7A22 Manual (PDF)]
==Links==
* [http://w140.com/smb/7a22_sm.pdf  Tektronix 7A22 Manual (OCR, PDF)]
{{Documents|Link=7A22}}
 
==Internals==
The differential amplifier design is a variant of the [[1A7A]] circuit, also used with modifications in the [[3A9]], [[5A22N]], [[AM502]], and [[5030]]/[[5031]] ([[26A2]] too?).
 
<blockquote>
[[John Addis]] [[Preamble DA1855|says]]:
 
The [[1A7A]] (designed by [[Thor Hallen]]) and the 7A22 (designed by [[Val Garuts]]) used essentially the same circuit. Exactly who came up with the brilliant input circuit is lost to history. The 1A7A came out first, but Thor had worked as evaluation engineer for Val Garuts. Val does not remember who created the circuit, and Thor died in 2002.
</blockquote>
 
==Prices==
{| class="wikitable"
|-
! Year
! 1970
! 1971
! 1980
! 1984
! 1990
|-
! Catalog price
|align=right|  $500
|align=right|  $500
|align=right| $1,060
|align=right| $1,590
|align=right| $2,260
|-
! In 2023 Dollars
|align=right| $3,900
|align=right| $3,800
|align=right| $3,900
|align=right| $4,700
|align=right| $5,300
|-
|}


==Pictures==
==Pictures==


===Plug-in===
<gallery>
Tek 7a22 5.jpg
Tek 7a22 front.jpg | 7A22 front view
Tek-7a22-front.jpg
7a22-left.jpg      | left side
7a22-left-ext.jpg  | left side (with cover)
7a22-right.jpg    | right side
</gallery>
===Measurements===
<gallery>
<gallery>
Image:tek-7a22-front.jpg | 7A22 front view
tri-1000k_w.jpg         | 7A22: 1 kHz, 130 μV<sub>p-p</sub> triangle, BW=1 MHz
Image:tri-1000k_w.jpg | 7A22: 1 kHz, 130 μV<sub>p-p</sub> triangle signal, BW=1 MHz
tri-100k_w.jpg         | 7A22: 1 kHz, 130 μV<sub>p-p</sub> triangle, BW=100 kHz
Image:tri-100k_w.jpg | 7A22: 1 kHz, 130 μV<sub>p-p</sub> triangle signal, BW=100 kHz
tri-10k_w.jpg           | 7A22: 1 kHz, 130 μV<sub>p-p</sub> triangle, BW=10 kHz
Image:tri-10k_w.jpg | 7A22: 1 kHz, 130 μV<sub>p-p</sub> triangle signal, BW=10 kHz
tri-1k_w.jpg           | 7A22: 1 kHz, 130 μV<sub>p-p</sub> triangle, BW=1 kHz
Image:tri-1k_w.jpg | 7A22: 1 kHz, 130 μV<sub>p-p</sub> triangle signal, BW=1 kHz
7a22-7613--tri-15uV.jpg | 15 μV p-p triangle wave displayed in variable-persistence storage mode on a [[7613]] for noise filtering
</gallery>
</gallery>


[[Category:7000 series vertical plugins]
[[Category:7000 series vertical plugins]]
[[Category:Differential amplifiers]]

Latest revision as of 23:26, 19 May 2024

Tektronix 7A22
1 MHz differential amplifier
7A22 front view

Compatible with 7000-series scopes

Produced from 1969 to 1991

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix 7A22 is a single channel differential vertical amplifier for the 7000 series mainframes, designed by Val Garuts and produced from about 1969 to 1991. Specifications and controls are similar to the 26A2 and the 3A9 from the 560 series but without current probe input nor front panel signal output.

The 7A22's input sensitivity reaches down to 10 μV/Div. Bandwidth is 1 MHz, the upper 3 dB limit can be reduced in ×3 steps down to 100 Hz (to eliminate noise, inter alia), and the lower bandwidth can be raised in ×10 steps from 0.1 Hz to 10 kHz. A separate control optionally supplies an internal DC voltage to offset the DC signal component. Even in the most sensitive ranges (10 μV/Div to 10 mV/Div), common-mode voltage can be ±10 V. Input resistance is 1 MΩ, but for high source resistance DC coupled measurements, one can disconnect the internal gate return resistors of the input FETs, at the disadvantage of disabling the 20 mV/div and higher ranges.

Applications include audio, biological signals, sensors etc.

An example application is found in Jim Williams' LT Application Note 124 – see Appendix D for a comparison of differential amplifiers.

Key Specifications

Bandwidth 1 MHz, LF limit switchable DC, 0.1 Hz to 10 kHz in ×10 steps, HF limit switchable 100 Hz to 1 MHz in ×3/×10 steps
Deflection 10 μV/Div to 10 V/Div in 1–2–5 sequence
Input impedance 1 MΩ // 47 pF (either input)
Signal ranges
Range Differential signal DC Offset Common mode
10 μV/Div to 10 mV/Div ±1 V ±1 V ±10 V
20 mV/Div to 0.1 V/Div ±10 V ±10 V ±100 V
0.2 V/Div to 1 V/Div ±100 V ±100 V ±500 V
2 V/Div to 10 V/Div ±1000 V ±1000 V ±500 V

Links

Documents Referencing 7A22

Document Class Title Authors Year Links
Tekscope 1969 V1 N5 Oct 1969.pdf Article Introducing the New Generation 1969 7000-series scopes • 7504 • 7704 • 7A11 • 7A12 • 7A13 • 7A14 • 7A16 • 7A22 • 7S11 • 7M11 • 7B50 • 7B51 • 7B70 • 7B71 • 7T11 • R5030 • 7000 series readout system • Miniature relays • Cam switches • Industrial Design • T7500 • T7700 • P6052 • P6053 • C-50 • C-51 • 204-2
Tekscope 1969 V1 N6 Dec 1969.pdf Article A New Logic for Oscilloscope Displays 1969 7000-series scopes • 7A11 • 7A12 • 7A13 • 7A14 • 7A16 • 7A22 • 7B50 • 7B51 • 7B70 • 7B71 • 7S11 • 7T11 • 7504 • 7704
Tekscope 1971 V3 N2.pdf Article Measuring the Linearity of Fast Ramps John McCormick 1971 7S11 • 7T11 • 7A22 • P6034 • P6035 • P6051 • S-3A • S-5
Tekscope 1972 V4 N5 Sep 1972.pdf Article A Practical Approach to Differential Amplifiers and Measurements Fred Beckett 1972 112 • 11A33 • 1A5 • 1A6 • 1A7 • 1A7A • 26A2 • 3A9 • 5A22N • 7A13 • 7A22 • AM502 • D • E • G • P6055 • P6046 • W • Z
Tekscope 1972 V4 N6 Nov 1972.pdf Article Differential Amplifiers and Measurements, Part 2 Fred Beckett 1972 112 • 11A33 • 1A5 • 1A6 • 1A7 • 1A7A • 26A2 • 3A9 • 5A22N • 7A13 • 7A22 • AM502 • D • E • G • P6055 • P6046 • W • Z

Internals

The differential amplifier design is a variant of the 1A7A circuit, also used with modifications in the 3A9, 5A22N, AM502, and 5030/5031 (26A2 too?).

John Addis says:

The 1A7A (designed by Thor Hallen) and the 7A22 (designed by Val Garuts) used essentially the same circuit. Exactly who came up with the brilliant input circuit is lost to history. The 1A7A came out first, but Thor had worked as evaluation engineer for Val Garuts. Val does not remember who created the circuit, and Thor died in 2002.

Prices

Year 1970 1971 1980 1984 1990
Catalog price $500 $500 $1,060 $1,590 $2,260
In 2023 Dollars $3,900 $3,800 $3,900 $4,700 $5,300

Pictures

Plug-in

  • 7A22 front view

    7A22 front view

  • left side

    left side

  • left side (with cover)

    left side (with cover)

  • right side

    right side

Measurements

  • 7A22: 1 kHz, 130 μVp-p triangle, BW=1 MHz

    7A22: 1 kHz, 130 μVp-p triangle, BW=1 MHz

  • 7A22: 1 kHz, 130 μVp-p triangle, BW=100 kHz

    7A22: 1 kHz, 130 μVp-p triangle, BW=100 kHz

  • 7A22: 1 kHz, 130 μVp-p triangle, BW=10 kHz

    7A22: 1 kHz, 130 μVp-p triangle, BW=10 kHz

  • 7A22: 1 kHz, 130 μVp-p triangle, BW=1 kHz

    7A22: 1 kHz, 130 μVp-p triangle, BW=1 kHz

  • 15 μV p-p triangle wave displayed in variable-persistence storage mode on a 7613 for noise filtering

    15 μV p-p triangle wave displayed in variable-persistence storage mode on a 7613 for noise filtering

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