RBS 2308 - Digital Design Manager
Manager of a digital design team 2000-2004 located in Göteborg, responsible for the digital design of the Ericsson RBS 2308 micro radio base station for GMS-EDGE.
Senior System Engineer
2016 - 2023
Started as a system engineer in 2016 for Alelion, which made low voltage battery systems for forklifts. My focus was on system design and strategies leading towards providing 800 V battery systems with a lot of new considerations for the company on how to address electrical isolation, functional safety, liquid cooling techniques, cell performance and simulation of drive cycles, software test strategies, documentation, etc.
Also, a completely new module concept needed to be invented to meet the cost goals of the company and to fulfill many requirements on voltage, capacity, cell type and cooling/heating methods.
Mobile Telecom - Ericsson
2000 - 2016
WCDMA - Software
In 2005 I made a radical transition from hardware to WCDMA baseband software design; coding test benches in C, evolving HIL tests and leading a design team.
From 2012 to 2016 I was acting as a product owner for several WCDMA RAN features involving several agile design teams.
Space Technology
and
Signal Processing
1990 - 2000
SOHO - TFG
The Transfer Frame Generator (TFG) electronics was my first professional design consisting of lots of discrete digital gates (54HCxx family) accompanied with a few SRAMs acting as data buffers and a ROM used to compose a large state machine to compile the telemetry transfer frames.
The TFG was closely connected to the processor board of a fairly large electronic equipment called the Central Data Managent Unit (CDMU). This equipment controls the entire satellite and collects, stores and formats telemetry data from all the scientific instruments on the SOHO satellite. All telemetry data from the instruments was formatted by the TFG electronic boards before being transmitted to Earth.
SOHO stands for SOlar Heliospheric Observatory and was a joint NASA and ESA project developed in the early 1990s. The satellite was launched in 1995 and has a very interesting history, surpassing its intended 2.5 year life span by far.
Artemis - FODM
The purpose of the Artemis satellite was to demonstrate new communication technologies, in particular a laser for communicating with other satellites. This laser link enables better data link availability to, for instance weather satellites, in low earth orbit.
I was object leader of a small part of the optical data link called FODM, short for Forward Optical DeModulator. This electronic equipment was a
5.5 GHz 2 Mbps DBPSK demodulator.
The FODM equipment contained a microwave low-noise receiver, an analog heterodyne receiver, a digital basband sampler with a bit-synchronized locked loop and a DC/DC converter supplying the electronics. Together with a talented team of a handful of engineers, we were able to pull off this challenging design feat.
Envisat - Meris STPM
The Medium Resolution Imaging Spectrometer (MERIS) was a programmable spectrometer on board the Envisat mission, operating in the solar reflective spectral range. The instrument had a rotating disc with optical filters and mirrors for calibration purposes.
The disc was mounted on the axis of a fairly big stepper motor which was controlled by STPM, or STePper Motor electronics which I designed in the mid 1990s.
The movement of the 1200-magnet stepper motor needed to be very smooth and follow a particular acceleration and retardation profile to minimize any vibrations and counter forces acting on the satellite. Also, the controller needed to accomodate 128 microsteps within each step on the motor.
This design used discrete 54HCxx logic, an 8kB ROM and two H-bridges made from HexFETs to control the motor windings. The switching frequency of the PWM controlled HexFETs was around 30 kHz.
The motion of the motor was analyzed using the new DFFT plugin for a Textronix oscilloscope to verify that no unexpected harmonics were created by the motor control.