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Final Report – ResAcc 323535
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Table 1: Specifications
Parameter Value
Range +/‐ 80 g
Bandwidth >1 kHz
Resonant frequency 46 kHz
Noise 0.2 mg in 100 Hz bandwidth
Temperature range ‐45 °C to +125 °C
Long term stability <0.1 mg
Power consumption <100 mW, ideally 20 mW
Area <5x5 mm2
Figure 1: WP breakdown
WP4 DisseminationT4.1 Plan for using and disseminating knowledge T4.2 Project Portal and Web site
T4.3 Scientific production T4.4 Exploitation Plan
WP5 ManagementT5.1 Management and reporting T5.2. Planning, control of execution
T5.3 Coordination and internal communication T5.4 Risk and quality management
WP1 SpecificationsT1.1 Detailed architecture
definitionT1.2 Detailed specifications
WP2 ASIC designT2.1 Sensor Interface design
T2.2 Digital design T2.3 System design T2.4 Fine tuning
WP3 CharacterizationT3.1 MPW1
T3.2 Characterization set‐upT3.3 Characterization
T3.4 MPW2 T3.5 Re‐characterization
Final Report – ResAcc 323535
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Figure 2: Block diagram of the system
Final Report – ResAcc 323535
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Figure 3: Layout of the chip
Figure 4: PCB frontside with the ResAcc ASIC
Final Report – ResAcc 323535
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Figure 5: PCB backside with the socket for the Thales accelerometer cell
Figure 6: Transfer function of the main oscillator loop versus Vgate.
‐30
‐20
‐10
0
10
20
30
40
1000 10000 100000 1000000
Gain (dB)
Freq (Hz)
EXC1 / DET1 vs. Vgate100.30.40.450.50.550.60.650.70.750.80.850.911.11.52
T=25°CAmp. loop diff. amp. gain = 0x7loop transimpedance tuning = 0x8Output buffer gain =0x7
Vgate1(V)
Final Report – ResAcc 323535
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Figure 7: Transfer function (top: gain, bottom: phase) of the main oscillator loop
Figure 8: Transfer function of the damping loop
100 1000 10000 100000 1000000
‐30
‐20
‐10
0
10
20
30
40
50E1_amort / DetAmort vs. Q factor selection
Freq (Hz)
Gain (dB)
85°C
20°C
‐40°CTrimming of the BPF amplifier = 0x0
Trimming of the BPF = 0x0
Q factor selection = 0x60x70x20x30x40x50xA0xB0x80x9
Final Report – ResAcc 323535
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Figure 9: Charge pump and high voltage regulator function
Figure 10: Oscillator start-up
Final Report – ResAcc 323535
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Figure 11: Waveform on pads EXC1 et OSCP1
Figure 12: Waveform with internal amplitude control
Final Report – ResAcc 323535
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Figure 13: Waveforms of the 2 oscillators with internal amplitude control
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