Sunday, June 28, 2015

The Spice in Analog Design

Analog Designers created Spice, Analog Design Professionals are adding their experience in many commercial and free spice EDA tools. When you are creating a new demanding design, a working solution is achieved by combining workbench and simulation work.

The Spice in Analog Design

Lab Test Bench and Breadboard testing needs to be done along with analog simulation. Power and mixed signal design too, needs to be verified on board. This is more true for a new design lab or new engineers. Experienced designers will not make many mistakes as design blocks would be in their collections or in their knowledge base. It is this knowledge that can build the simulator itself, this makes the simulator as skilled as the designer but also limited to his or that firm's experience. In a full digital design, simulation does a more complete Virtual Test bench role.

A simulation tool can help you test the blocks and helps catch some design and concept errors. When you build a live breadboard prototype, some real issues facing your design can emerge.

Spice is a analog design aid and helps mixed design circuit simulation, See the Spice homepage.

SPICE (Simulation Program with Integrated Circuit Emphasis) is a general purpose analog electronic circuit simulator. It is a powerful program that is used in IC and board-level design to check the integrity of circuit designs and to predict circuit behavior. - Wikipedia

Spice Resources

Sunday, June 21, 2015

MCS48 Code for 80C39 Microcontroller

80C39 is a Cmos Version of 8048 the one that preceded 8031-8051. MCS48 is the set for that, MCS51 is the current set.

Here is an example project for 80C39-8748-8749 microcontroller. This code was written by me, and it works. But the documentation is not complete or may have errors.

80C39-8749 MCS-48 Examples and code.

Process Controller code here 80C39 Code for MCS48 (editable spreadsheet online) or use pc80C39.zip.
The circuit for these are on this page along with other circuits.

This may be difficult to put together now. But the code and hardware is near compatible to 8051 uC. Now there are may types of ADC and uC.

The circuit of the Analog Front End was a V-F Converter

Analog Front End was a V-F Converter

This was supposed to have Analog in and Analog out. Some parts of the circuit may be in the 80C51 page. This has ramp-up and ramp-down settings for the Increment and Decrement buttons. This helps setting setpoint quickly. There is also debouncing for the pushbutton.

Friday, June 19, 2015

Intersil Hot Ideas 1983 Mixed CMOS Revolution

These helped me build Intelligent Instruments in the 80s. Intersil was with GE earlier, innovators of   advanced CMOS before anybody else. They made the smartest chips when the Microprocessors were being examined Skeptically by engineers. (At that time Microprocessors needed many support chips and consumed huge power only later CMOS uC came).

Intersil Hot Ideas - 1983

Intersil Hot Ideas - 1983

Today i found out that another company of that time called Datel is back, it was first a part of GE like Intersil then went to Murata now after decades it is back home.

"Datel was established in 1970 and has been a long time leader in providing high precision data acquisition components, including data converters, power supplies, DC-DC converters, and digital panel meters. "