Patent US 4146844A
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| Patent number | US 4146844A (click link for details and documents via Google Patents) |
|---|---|
| Title | Feed-forward amplifier |
| Inventors | Pat Quinn |
| Company | Tektronix Inc |
| Filing date | 1977-10-31 |
| Grant date | 1979-03-27 |
Cited By:
| Patent | Title | Inventors | Assignee | Granted |
|---|---|---|---|---|
| Patent EP 0110614 | Current-limiting mechanism for a precision differential amplifier | Art Metz • Ken Schlotzhauer | Tektronix Inc | 1987-01-14 |
| Patent US 4322688A | Cascode feed-forward amplifier | Ken Schlotzhauer • Art Metz | Tektronix Inc | 1982-03-30 |
| Patent US 4528517A | Overdrive thermal distortion compensation for a Quinn cascomp amplifier | Ken Schlotzhauer | Tektronix Inc | 1985-07-09 |
Related products:
| Manufacturer | Model | Description | Introduced | Designers |
|---|---|---|---|---|
| Tektronix | 2445 | Portable 150 MHz 4-ch scope | 1984 | Art Metz • Ken Schlotzhauer • Walt Ainsworth • Wink Gross • Mike Metcalf • Marv LaVoie |
| Tektronix | 2465 | Portable 150/300 MHz 4-ch scope | 1984 | Art Metz • Ken Schlotzhauer • Walt Ainsworth • Wink Gross • Mike Metcalf • Marv LaVoie |
| Tektronix | 2465A | Portable 150/250/350 MHz 4-ch scope | 1986 | Art Metz • Ken Schlotzhauer • Walt Ainsworth |
| Tektronix | 2465B | Portable 200/250/400 MHz 4-ch scope | 1989 | Art Metz • Ken Schlotzhauer • Walt Ainsworth |
| Tektronix | 2467 | Portable 350/400 MHz 4-ch micro-channel scope | 1986 | Art Metz • Ken Schlotzhauer • Walt Ainsworth |
| Tektronix | 2467B | Portable 350/400 MHz 4-ch micro-channel scope | 1989 | Art Metz • Ken Schlotzhauer • Walt Ainsworth |
Related components:
| Manufacturer | Part | Description | Designers |
|---|---|---|---|
| Tektronix | 155-0237-00 | vertical output amplifier | Art Metz |
| Tektronix | 155-0238-00 | preamplifier | |
| Tektronix | 155-0239-00 | trigger | Ken Schlotzhauer |
| Tektronix | 155-0241-02 | horizontal output stage |
Documents referencing Patent US 4146844A:
| Document | Title | Authors | Year | Links |
|---|---|---|---|---|
| Technology Report October 1979.pdf | Patent Received: 4,146,844 Feed-Forward Amplifier | Pat Quinn | 1979 | Cascomp • Patent US 4146844A |
This patent describes the so-called "cascomp" amplifier − see John Addis, Good Engineering and Fast Vertical Amplifiers, in Jim Williams (Ed.), Analog Circuit Design: Art, Science and Personalities (1991), p.107+
According to Addis,
[the circuit] was used extensively in the 2465 to reduce the power requirements by increasing linearity for a given standing current.
Because of its inherent linearity and low thermal distortion, the Cascomp configuration was the basis for many designs in the 2400 series scopes. It was used in such diverse applications as the trigger, horizontal output, and all vertical system IC designs.
See also
- P. A. Quinn, A cascode amplifier nonlinearity correction technique, in IEEE Int. Solid-State Circuits Conference., New York, NY, 1981, pp. 188-272.
- S. Simpkins and W. Gross, Cascomp feedforward error correction in high speed amplifier design, in IEEE J. Solid-State Circuits Conference., vol. sc-18, no. 6 pp. 762-764, Dec. 1983
- K.Schlotzhauer and A. Metz, Cascode feed-forward amplifier, U.S. Patent 4 322 688
- K.Schlotzhauer, Overdrive thermal distortion compensation for a Quinn cascomp amplifier, U.S. Patent 4 528 517
- H. Jull, T. Balsom, J. Scott, Cascomp BJT Amplifier vs. traditional configurations (2012)
- Re-issue: Patent US RE31545E
Documents Referencing Cascomp
| Document | Class | Title | Authors | Year | Links |
|---|---|---|---|---|---|
| Technology Report October 1979.pdf | Article | Patent Received: 4,146,844 Feed-Forward Amplifier | Pat Quinn | 1979 | Cascomp • Patent US 4146844A |
| 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 |