17–20 Jun 2018
Leuven, Belgium
Europe/Brussels timezone
On-site registration will be possible on Monday, June 18, 08:30 to 10:00

Mixed-Signal Test Vehicle in Microchip Atmel ATMX150RHA

20 Jun 2018, 14:25
25m
Oral Radiation-hardened technologies for analogue and mixed-signal ICs Radiation Hardened Technologies

Speaker

Mr Julien Fleury (Weeroc)

Description

Introduction ------------ A test vehicle has been designed and tested by Airbus Defence and Space and CNES to evaluate the ATMX150RHA technology from Atmel Microchip. The design and test have been fully subcontracted to Weeroc. A 16-bit 10MSPS dual DAC and a series of analogue switch compose the main core of this test vehicle. On top of these main features, a selection of high voltage transistors, capacitors and resistors from the analogue library has been added for further total dose irradiation test. Fast LVDS transmitter and receiver from Atmel new 3.3V I/Os library have been added to characterize these new I/Os. 16-bit DAC Description ---------------------- The 16-bit DAC has been specified by Airbus Defence and Space. The main requirements are 16-bit parallel input, differential current output, embedded trimmable current reference and multiplying DAC capability, from 4 to 12 MSPS. The chosen architecture based on these requirement has been a mixed of binary and thermometer current steering DAC. The binary part is driving the 12 less significant bits while the thermometer structure drives the 4 most significant bits. A large array of transistor composes the main current source of the DAC. This array distributes semi randomly the current to any of the output of this DAC. Dummy transistor structure allows mismatch reduction in the current sources. The size of the array has been kept small to allow DAC multiplication capability at rather high frequency. A trade-off between output non-linearity and switching speed is required which translates into optimising the transistor mismatch and parasitic capacitance reduction. The current switching part is composed of latency-controlled buffer and binary-to-thermometer converter followed by an array of scaled latches. The latches control injected-charge compensated switches allowing to draw current in positive or negative branch of the analogue output. Voltage and current references are provided by a bandgap structure and a programmable current source. The DAC is biased in 1.8V. Internal voltage regulators allow 3.3V to 1.8V conversion. Architecture and measured performances will be presented in this paper. Fast Analogue Switch -------------------- The fast analogue CMOS switch has been specified to have a 500MHz bandwidth with a below 20 Ohm Ron. The switch must be 5V compatible and shall have a transition time below 20ns. It has been designed to be both 3.3V and 5V compatible with a 1.8V or 3.3V control signal. Several configuration of that switch including a T structure has been embedded and tested in the test vehicle. Measurement results on that switch will be presented in the paper. Conclusion ---------- This paper is aimed to present silicon measurement of a first test vehicle in a promising mixed signal technology widely used in automotive industry and qualified for space application. That test vehicle is a first step towards a unified and qualified European analogue IP library. Promising results and future development plan will be presented.

Summary

A test vehicle has been designed and tested by Airbus Defence and Space and CNES to evaluate the ATMX150RHA technology from Atmel Microchip. The design and test have been fully subcontracted to Weeroc. A 16-bit 10MSPS dual DAC and a series of analogue switch compose the main core of this test vehicle. On top of these main features, a selection of high voltage transistors, capacitors and resistors from the analogue library has been added for further total dose irradiation test. Fast LVDS transmitter and receiver from Atmel new 3.3V I/Os library have been added to characterize these new I/Os. This paper will present silicon measurement of that test vehicle. That test vehicle is a first step towards a unified and qualified European analogue IP library. Promising results and future development plan will be presented.

Primary authors

Dr Jean-Baptiste Cizel (Weeroc) Mr Julien Fleury (Weeroc) Dr Salleh Ahmad (WEEROC SAS)

Co-authors

Mr Bernard Sanctorum (Airbus Defence and Space) Mr Matthieu Dollon (Airbus Defence and Space) Mr Olivier Perier (Airbus Defence and Space) Ms Sylvie Passant (Airbus Defence and Space)

Presentation materials

Peer reviewing

Paper