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

2. PP2 regulators´ setup Controller board Regulator board Type 2 cables with sense lines connected at the end of the cable Labview interface Canbus supply Controller supply Regulator supply 2 L. Gonella6/8/2011

3. Setting the voltage at the end of the Type2 cables (1) Via the labview interface it is possible to set the voltage desired at the end of the Type 2 cables –The regulators use the measurement done via the sense lines to adjust their outputs, according to the load current, to keep this value constant The setting of the desired voltage at the end of the Type 2 cables is done by adjusting the regulator´s potentiometer –1.23V – 2.17V –At start up the value of the potentiometer is not predictable Before powering the regulator board give a KILL command to disable all the regulators outputs Then power the board, move the potentiometer of the powered channel to -99 In this way the voltage at the output of the regulator is 1.23V (minimum achievable value) after UNKILL –The cursor in the program allows to chage the potentiometer value with respect to its current position. Example: 1.231V → +10 → 1.290V, ΔV = 0.059V 1.490V → +10 → 1.591V, ΔV = 0.101V 3 L. Gonella6/8/2011

4. Setting the voltage at the end of the Type2 cables (2) –The regulation is not linear. Example: 1.231V → +10 → 1.289V, ΔV = 0.051V 1.231V → +20 → 1.359V, ΔV = 0.128V 1.231V → +30 → 1.421V, ΔV = 0.190V –To know what value is set the best way is to measure it directly at the end of the cable It is also done by the software but this does not give a precise value –An ADC on the regulator board reads the sensed voltage –In the experiment this is read out by the DCS which contains the calibration curve of the ADC –In this setup the ADC is read by the controller which does not store the calibration curve but has only a few points The measurement of the regulator output can be done on the connector at the beginning of the Type 2 cable 4 L. Gonella6/8/2011

5. Power configuration with regulators PP2 regulators´ setup Type2 cables VregVsenseVin1 Vin2VDDAVDDD 1.8V I1 I2 5 L. Gonella6/8/2011 Measured at the pad Measured across R=10mΩ

6. Voltages and currents Vreg (V)Vsense (V)Vin1 (V)Vin2 (V)VDDA (V)VDDD (V)I1 (A)I2 (A) Power up2.2971.8081.7821.7831.5091.1940.1500.140 Clock on2.3451.8061.7821.7841.5061.1890.1800.150 Std cfg2.6231.8071.7481.7831.4541.1840.3800.150 PrmpVbp*22.8181.8041.7201.7801.4191.1760.5100.150 6 L. Gonella6/8/2011

7. Threshold scan 7 L. Gonella6/8/2011

8. Threshold scan – PrmbVbp*2 8 L. Gonella6/8/2011

9. PP2 regulator vs commercial supply PP2 regulator + Type2 cablesCommercial supply StdPrmpVbp*2StdPrmpVbp*2 Vth4618462644994466 Vth dispersion588572.6599.4588 Noise150.6144.1152.2142.3 Noise dispersion14.1112.4816.2613.45 9 L. Gonella6/8/2011 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)