Analysis and Simulation
We use MathCad, PSpice, LTSpice, a few custom design programs and MS Excel for design analysis and simulation.
Above: Initial calculated loop response of power supply
SG Designs has a very well equipped lab. For example, instruments enable us to measure power supply loop response (Bode plots).
Above: Measured loop response of power supply
The ‘hidden schematic’
With high speed switched mode and RF designs the layout is inherently part of the circuit.
Parasitic inductance, capacitance and resistance must be carefully controlled, as must signal power and ground tracking and decoupling in precision analogue designs. Therefore, to achieve the best results we layout our own designs.
We mainly use Ranger XL, but can also use PADS and PCAD.
We use 2D and 3D mechanical CAD in house and for more complex design or product styling we have close links with a few Industrial Design houses.
We have a full suite of test equipment including:
N4L PSM1735 phase/gain frequency response analyser
N4L PPA2530 Precision power and harmonic analyser
Rigol EMC spectrum analyser
4 of LeCroy DA1855A differential amplifiers
Four of TTI Intelligent DMMs
Four of High speed DC/AC Hall current probes
100MHz Differential probes
40 kV 75MHz high voltage probes
sThree Kikusui electronic loads
Thermal measurements including IR thermal imaging
34970A Data Acquisition / Data Logger Switch Unit
6 of Low and High voltage lab PSU
Elgar variable frequency/voltage AC PSU
Variac and Isolation transformer
Wavetek 50MHz pulse/function generator
2 Channel 14 bit/100Mhz ADC data logger
Fluke Ti25 Thermal camera