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Powering tests with the PP2 regulator

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. VDDA VDDD. I1 I2. Measured at the pad.

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Powering tests with the PP2 regulator

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  1. Powering tests with the PP2 regulator Laura Gonella Physikalisches Institut Uni Bonn

  2. Power configuration with regulators Rext = 10kOhm PP2 regulators´ setup 1.8V Type2 cables Rext = 18kOhm Vreg Vsense Vin1 Vin2 VDDA VDDD I1 I2 Measured at the pad Measured across R=10mΩ L. Gonella

  3. Rext2 = 18KOhm L. Gonella

  4. 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 Clock on Clock off L. Gonella

  5. Transients • 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)) I = 0.510A -> 0.290A I = 0.290A -> 0.510A Reg1 input Reg1 input VDDA VDDA L. Gonella

  6. Power configuration 1 PP2 regulators´ setup Type2 cables Vreg0 Vreg1 Vsense1 VDDA VDDD Measured at the pad L. Gonella

  7. Voltages and currents • 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 L. Gonella

  8. Threshold L. Gonella

  9. Threshold – PrmpVbp*2 L. Gonella

  10. Power configuration 2 • Short between VDDD and VDDA is done on the board Type2 cables PP2 regulators´ setup Vreg1 Vsense1 VDDA VDDD Measured at the pad L. Gonella

  11. Voltages and currents L. Gonella

  12. Threshold L. Gonella

  13. Threshold – PrmpVbp*2 L. Gonella

  14. Summary of threshold and noise L. Gonella

  15. Backup L. Gonella

  16. Power configuration with regulators PP2 regulators´ setup 1.8V Type2 cables Vreg Vsense Vin1 Vin2 VDDA VDDD I1 I2 Measured at the pad Measured across R=10mΩ L. Gonella

  17. Voltages and currents L. Gonella

  18. Threshold scan L. Gonella

  19. Threshold scan – PrmbVbp*2 L. Gonella

  20. PP2 regulator vs commercial supply • 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) L. Gonella

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