See attachment for a Sliding-Class-A output stage.

(from an S.E.D discussion)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

America: Land of the Free, Because of the Brave

Jim Thompson wrote:

See attachment for a Sliding-Class-A output stage.

(from an S.E.D discussion)

...Jim Thompson

And where exactly is the sliding bias generator ?

Quasi-complementary output stages are deprecated in audio btw. You of all ppl should
know about the mismatch of transfer function.

Graham

On Mon, 03 Sep 2007 08:12:34 -0700, Jim Thompson
wrote:

See attachment for a Sliding-Class-A output stage.

(from an S.E.D discussion)

...Jim Thompson


Whoa, an all-NPN opamp! One of the first integrated opamps I ever used
(I used to make my own, with discretes, on little pcb sips, which
weren't bad) was a GE part. It too was all NPN, but used a zener level
shifter, and was about as useful as a noise generator as an opamp.

Anybody got a datasheet on that?

John

On Mon, 03 Sep 2007 10:55:30 -0700, John Larkin
wrote:

On Mon, 03 Sep 2007 08:12:34 -0700, Jim Thompson
wrote:

See attachment for a Sliding-Class-A output stage.

(from an S.E.D discussion)

...Jim Thompson


Whoa, an all-NPN opamp!

Yup. This pre-dates lateral PNP's. As I said, "as a lad of 24", i.e.
1964. But it's low distortion, high slew rate and external ability to
compensate... called a "feature" (we couldn't make MOS capacitors in
those days ;-), makes it a seller even today.

One of the first integrated opamps I ever used
(I used to make my own, with discretes, on little pcb sips, which
weren't bad) was a GE part. It too was all NPN, but used a zener level
shifter, and was about as useful as a noise generator as an opamp.

Anybody got a datasheet on that?

John

The GE part? I might. What was the part number?

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

America: Land of the Free, Because of the Brave

On Mon, 03 Sep 2007 16:41:53 +0100, Eeyore
wrote:



Jim Thompson wrote:

See attachment for a Sliding-Class-A output stage.

(from an S.E.D discussion)

...Jim Thompson

And where exactly is the sliding bias generator ?

Quasi-complementary output stages are deprecated in audio btw. You of all ppl should
know about the mismatch of transfer function.

Graham

The quasi comp may not hold for class A since both sides are always
conducting hard in traditional class A - and sliding bias shouldn't be
much different - but I don't understand how it slides.
--

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