Viewing profile — agoetz

Another benefit of biased representation, is that it makes error values extremely noticeable. It is common in automotive situations to reserve part of the representable range to in…

Most RTCs do use the same crystals that are in wristwatches, which is actually the source of their error. The tuning fork crystal design used in wrist watches has a parabolic tempe…

> Embedded systems, IMO, must be deterministic, reliable and consistent. This is the definition of a hard real-time system. In most of the literature, 'embedded system' is a broade…

Actually this article is talking about mild hybrid technology: Which is about upping the voltage for traditional non hybrid vehicles from 12V to 48V, giving them some hybrid like f…

SW Solution: 1. Store embedded system state in data structure. 2. Calculate a checksum for that data structure. 3. Verify that checksum is correct. HW Solution: Lockstep Execution/…

If you try to estimate power spectral density using the intuitive unbiased estimator (the DFT), you are going to have a bad time. A vanilla periodogram has very high sideband leaka…

Claiming that the FT is not necessary for digial audio is like claiming that the you don't need the rocket equation in order to build a missile. Sure, its technically possible, and…

Yes. Reformulate the systems transfer function into a state space representation, and then solve the algebraic ricatti equation to find an optimal gain matrix. This is know and the…

The apollo guidance computer actually used a sophisticated software interpreter for most of its code. Not just a "computational loop with no branches" http://en.wikipedia.org/wiki/…

OSEK is a an industry standard rtos that is used by almost all automotive players. It is specifically designed for use in the automotive environment. Toyota actually claimed to use…

Modern EPA requirements mean that it is impossible to design a compliant off highway commercial vehicle without relying on advanced electronic process controls. Your grandfather's …

Adding a new sensor to monitor the fuses would not be cheap:first off, you have to have signal conditioners for the a/ds that can handle esd transients, and >60 v load shed events.…

Signal conditioning is still an important part of EE design. Not all signals are TTL level and unipolar. For example, this appnote[0] uses a Delta-Sigma converter to digitize a loa…

Generally the system will fall back to a 'limp home mode' running on a simpler algorithm on a watchdog microcontroller. See for example, Freescale's reference design for an airbag …

Register renaming has been around since the 60's in the form of Tomasulo's Algorithm.

DRAM refresh circuit, not SRAM. The "S" in SRAM means that it doesn't need to be refreshed.

Not necessarily. The LM7805 has a maximum operating temperature of 125C, so a circuit can be operating nominally at a very high temperature.

Most of the magic doesn't come from the robots, it comes from the soldermask. Surface tension from molten solder will move misaligned parts by a surprising amount: http://youtu.be/…

Bonus: Once you have a couple of data points from the tape method, you can extrapolate the emissivity of the toast itself and calculate a correction factor for your IR gun.

Make a circuit "digital" does not automagically make it more accurate, and you cannot "add bits" to a datatype to make your measurement more accurate. Before a digital circuit can …

FORTH comes to mind.