John Addis
John Addis is an engineer who worked for Tektronix (now retired).
Tek products
- designed the 1A7 (not the 1A7A, which was designed by Thor Hallen and is electrically similar to the 7A22). The 1A7 was Addis' first design at Tektronix.
- designed the 7A11 amplifier
- designed the 067-0681-01 pulse generator / calibration fixture
- designed the 155-0078-xx (M84) amplifier chip
- with Wink Gross, co-designed the vertical amplifier for the 485 (Ref 1)
- responsible for vertical system in the 7104
- with Wink Gross, co-designed the hybrid amplifiers for the 7104 (Ref 1)
- M377 preamplifier IC for 11000-series scopes (Ref 2, Ref 1)
Patents
- US Patent 3,582,807 Amplifier Gain Control Circuit Including Diode Bridge
- US Patent 3,710,270 Linear Gain Control
- US Patent 3,906,344 Oscilloscope having selectable input impedances
- US Patent 4,132,958 Feedbeside correction circuit for an amplifier
- US Patent 4,390,852 Buffer Amplifier
- US Patent 4,551,636 Wide bandwidth signal coupling circuit having a variable voltage-level shift from input to output
- US Patent 4,647,889 Rotary control having variable detents
- US Patent 4,667,146 Voltage-controlled push-pull current source
- US Patent 4,704,558 Method and apparatus for automatic oscilloscope calibration
- US Patent 4,713,627 Active filter with bootstrapping
- US Patent 4,714,896 Precision differential amplifier having fast overdrive recovery
- US Patent 4,725,790 Broadband DC level shift circuit with feedback
- US Patent 4,731,588 Gain selectable amplifier with resonance compensation
- US Patent 4,731,693 Connection apparatus for integrated circuit
- US Patent 5,075,636 Differential amplifier with fast overdrive recovery
Links
- John Addis, Good Engineering and Fast Vertical Amplifiers, in Jim Williams (Ed.), Analog Circuit Design: Art, Science and Personalities (1991), p.114 (Ref 1)
- P.Starič, E. Margan: Wideband Amplifiers (Ref. 2)
- A Tektronix oscilloscope that moved faster than light? The Oregonian, 23 Sep 2011. (Original no longer accessible, link via archive.org.), and the paper referred to in that article, Kirk T. McDonald, Radiation from a Superluminal Source
Photos
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John Addis and Barrie Gilbert
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Zorana Starič and John Addis
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John Addis fixing a 547
