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

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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