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Powering tests with the PP2 regulator. Laura Gonella Physikalisches Institut Uni Bonn. Power configuration with regulators. Rext = 10kOhm. PP2 regulators´ setup. 1.8V. Type2 cables. Rext = 18kOhm. Vreg. Vsense. Vin1 Vin2. VDDAVDDD. I1 I2. Measured at the pad. - PowerPoint PPT Presentation
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Powering tests with the PP2 regulator
Laura GonellaPhysikalisches Institut Uni Bonn
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Power configuration with regulators
PP2 regulators´ setup
Type2 cables
Vreg Vsense Vin1 Vin2 VDDA VDDD
1.8V
I1 I2
6/15/2011
Measured at the pad
Measured across R=10mΩ
Rext = 10kOhm
Rext = 18kOhm
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Rext2 = 18KOhm
Vsense (V)
Vin1 (V)
Vin2 (V) VDDA (V)
VDDD (V)
I1 (A) I2 (A)
Power on 1.811 1.786 1.794 1.511 1.209 0.160 0.080
Clock on 1.810 1.784 1.794 1.509 1.204 0.180 0.080
Std cfg 1.808 1.749 1.786 1.456 1.191 0.380 0.120
PrmpVbp*2
1.807 1.723 1.786 1.423 1.190 0.510 0.120
Std gfg PrmpVbp*2
Vth 4576 4577
Vth disp 587.6 577.6
Noise 149.4 144.9
Noise disp 14.74 12.97
6/15/2011
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Transients
• All inputs and outputs of the regulators are very noisy if looked at with a single ended probe– Most likely a ground problem cause the situation is much better
when using a differential probe, except for one input• The input of Reg1 observed with a differential probe shows a
disturbance of 250MHz freq and ~400mV amplitude which appears as soon as the clock is switched on
6/15/2011
Clock on Clock off
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Transients
6/15/2011
• Reducing the bandwidth to 20Mhz it is possible to see the levels shifting
• No transients are observed but this could be due to the chosen bandwidth
• Single ended probes (passive (blue), active (pink))
Reg1 input
VDDA
Reg1 input
VDDA
I = 0.290A -> 0.510AI = 0.510A -> 0.290A
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Power configuration 1
6/15/2011
PP2 regulators´ setup
Type2 cables
Vreg0 Vreg1
Vsense1 VDDA VDDDMeasured at the pad
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Voltages and currents
Vreg0 (V)
Vreg1 (V)
VDDD (V)
VDDA (V) I (A) Ia (A)
Id (A)
Power up1.257 1.528 1.240 1.499 0.029 0.009 0.015
Clock on1.355 1.556 1.233 1.498 0.100 0.064 0.031
Std cfg1.532 1.942 1.226 1.499 0.402 0.161 0.233
PrmpVbp*21.576 2.089 1.225 1.500 0.505 0.185 0.310
6/15/2011
• I is the current measured at the supply for the PP2 regulator board. It includes analog and digital current for the chip, plus 10mA biasing current of the PP2 regulators
• Analog and digital currents (resp. Ia and Id) are calculated considering R = 1.9Ω for the type 2 cables
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Threshold
6/15/2011
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Threshold – PrmpVbp*2
6/15/2011
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Power configuration 2
6/15/2011
PP2 regulators´ setup
Type2 cables
Vreg1 Vsense1 VDDA VDDDMeasured at the pad
• Short between VDDD and VDDA is done on the board
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Voltages and currents
Vreg1 (V)
VDDD (V)
VDDA (V) I (A)
Power up1.545 1.506 1.507 0.024
Clock on1.714 1.496 1.507 0.116
Std cfg2.289 1.489 1.505 0.422
PrmpVbp*22.48 1.487 1.504 0.529
6/15/2011
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Threshold
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Threshold – PrmpVbp*2
6/15/2011
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Summary of threshold and noise
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Std PrmpVbp*2 Std PrmpVbp*2 Std PrmpVbp*2
Vth 4870 4929 4653 4718 4576
4577
Vth disp 644.9
635 576 579 587.6
577.6
Noise 154.8
151 140.1 139.3 149.4
144.9
Noise disp 16.39
15.72 11.36 11.4 14.74
12.97
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Backup
6/15/2011
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Power configuration with regulators
PP2 regulators´ setup
Type2 cables
Vreg Vsense Vin1 Vin2 VDDA VDDD
1.8V
I1 I2
6/15/2011
Measured at the pad
Measured across R=10mΩ
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Voltages and currents
Vreg (V)
Vsense (V)
Vin1 (V)
Vin2 (V)
VDDA (V) VDDD (V)
I1 (A) I2 (A)
Power up 2.297 1.808 1.782 1.783 1.509 1.194 0.150 0.140
Clock on 2.345 1.806 1.782 1.784 1.506 1.189 0.180 0.150
Std cfg 2.623 1.807 1.748 1.783 1.454 1.184 0.380 0.150
PrmpVbp*2
2.818 1.804 1.720 1.780 1.419 1.176 0.510 0.150
6/15/2011
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Threshold scan
6/15/2011
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Threshold scan – PrmbVbp*2
6/15/2011
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PP2 regulator vs commercial supply
PP2 regulator + Type2 cables
Commercial supply
Std PrmpVbp*2 Std PrmpVbp*2
Vth 4618 4626 4499 4466
Vth dispersion 588 572.6 599.4 588
Noise 150.6 144.1 152.2 142.3
Noise dispersion 14.11 12.48 16.26 13.45
6/15/2011
• Comparison of threshold and noise values for this powering configuration with power from the PP2 regulators and with a commercial supply (shown 2 weeks ago)
