Group project, to create a file of equations, rules of thumb and handy approximations

Other useful rules of thumb:

Signals in repeatered wires go at an average speed of c/10.

In a photodiode circuit at 300K, shot noise dominates when the photocurrent drops at least 50 mV across the load resistor (2 kT/e).

The noise temperature of a PN junction used as a load resistor is half the ambient temperature (150K at room temperature).

A BJT current source with an emitter resistor dropping V_d volts will contribute 25 mV/V_d times full shot noise current.

A BJT differential pair driven by a current source with full shot noise will exhibit exactly full shot noise in each collector, regardless of deltaV_BE.

Cheers,

Phil Hobbs

Mine is easier to implement in a digital application ;-)

...Jim Thompson

Hey Wes, Good points, I will try to incorporate them in my future offerings. Harry

One nanocentury is about PI seconds.

Iwo

Megamall: 1E+6 shopping centers.

;-)

Prefer megamaul

martin

In article , Jim Thompson wrote: [.. go read it ..]

This digital stuff is just a passing fad.

The duration of the test being one ouchosecond.

- YD.

Digital is just a subset of ANALOG ;-)

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

Is anything really analog when the electroncs have a quantized charge? :-)

I always try to control the positions of the electrons and not their charges. Even though controlling the positions of electrons can be a little like herding cats, it is still easier than trying to modulate their charge.

I regularly redesign logic/digital circuits without any problem whatsoever.

Show me a digital designer who can do the same with an analog circuit.

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

And Tarzan can grab you a snack in a banasecond. ;-)

Aren't position and velocity, like, 90 degrees out of phase?

Thanks, Rich

Try not to dislocate your shoulder there, Jim.

Not since Cheetah greased one of his vines. :( BTW, those Tarzan movies were shot a few miles from here at Silver Springs, Florida, and some of the monkeys escaped and ran wild for years around Ocala.

Ok, how about capacity in a PCB of FR-4 material. Two mirrored surfaces, each of area A, separated by T, all in inches and Farads. C=(A*10^-12)/T or 1nF/sq"/0.001" Cheers, Harry

I use 15 pF/sq inch for .062 boards, pretty close.

The capacitance tempco of common FR4 is close to +900 ppm/K.

John

In article , Rich the Philosophizer wrote: [... me ...]

Only if they know you're watching. At other times, the position is on the good sofa.