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Case examples - analogue & digital circuit design

Embedded Systems & Control - Power supply, conversion, monitoring and control - Invertors - Switch mode - UPS - Motor Drive controllers - Instrumentation - Digital signal processing - Sound level metering - Video communications - Radio - GSM - GPS - Remote data acquisition - Modems - Displays - Internet - Software - Databases - Keyring 'button' memories - Acceleration metering - Force sensor - Cable capacitance measurement - Stress monitor - Transducers

Case Studies

Pseudo random generator and receiver

We designed the software for generating and receiving pseudo random bitstreams operating at 64khz. One PIC16C55 running at 20 MHz generates one of five different pseudo random sequences under the control of an 8751 processor. A second PIC16C55 also under the control of the same 8751 is used to detect the presence of the selected incoming signal, to lock to it if below a certain error count and then to count errors during the transmission. Compact code and the fast execution of the PIC allows this to all take place within the 64KHz period of 15uS (only 75 instructions). All five sequences can be placed into the 512 bytes of ROM contained in the PIC16C55. These units are in use today testing the integrity of digital transmission links.

 
Remote instrument node for offshore strain gauge and measurement

Embedded PFGA logic and an 8051 micro-controller are used to provide a control interface between specialist strain gauges, analogue sensing circuitry and a DSP host monitoring system. Designed to be used in intrinsically safe environments.