Rutherford Appleton Laboratory Particle Physics Department G. Villani Σ Powering Prague TWEPP 2007...

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Rutherford Appleton Laboratory Particle Physics Department G. Villani Σ Powering Prague TWEPP P c = I m 2 Rc P M = nI m V m Efficiency:= Example of efficiency plot vs. number of modules (N) vs. number of modules (N) and supply voltage (V) for I m = 2 A R c = 3 Ω for Serial Powering scheme Powering schemes comparison

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Rutherford Appleton Laboratory Particle Physics Department G. Villani Powering Prague TWEPP TWEPP-07 Topical Workshop on Electronics for Particle Physics TWEPP-07 Topical Workshop on Electronics for Particle Physics Prague 2007 Serial Powering of Silicon Sensors E.G. Villani, M. Weber, M. Tyndel, R. Apsimon Rutherford Appleton Laboratory Rutherford Appleton Laboratory Particle Physics Department G. Villani Powering Prague TWEPP Outline Serial Powering scheme Characteristics of shunt regulator Experimental results Conclusions Rutherford Appleton Laboratory Particle Physics Department G. Villani Powering Prague TWEPP P c = I m 2 Rc P M = nI m V m Efficiency:= Example of efficiency plot vs. number of modules (N) vs. number of modules (N) and supply voltage (V) for I m = 2 A R c = 3 for Serial Powering scheme Powering schemes comparison Rutherford Appleton Laboratory Particle Physics Department G. Villani Powering Prague TWEPP Current source provides power to the chain of shunt regulators. Each of them provides power to the local modules. Communication is achieved through AC coupled LVDS Each sensor has individual HV bias, referenced to its ground ( this might not be necessary) Test structure built and tested with SCT modules Initial stave tests done by C. Haber at LBL Serial powering diagram module chain shunt regulation - Rutherford Appleton Laboratory Particle Physics Department G. Villani Powering Prague TWEPP Serial powering diagram module shunt regulation - Rutherford Appleton Laboratory Particle Physics Department G. Villani Powering Prague TWEPP Shunt regulator advantageous for steady average current Series regulator can be thought of as a variable resistor in series with a load Series regulator can be thought of as a variable resistor in series with a load Fluctuations in current drawn by the load modifies via the feedback the resistor values : the power supply sees a constant current load, current circulates back into the supply Fluctuations in current drawn by the load modifies via the feedback the resistor values : the power supply sees a constant current load, current circulates back into the supply Shunt regulator can be thought of as a variable resistor in parallel with a load Shunt regulator can be thought of as a variable resistor in parallel with a load Fluctuations in current drawn by the load modifies via the feedback the resistor values : the power supply sees a constant resistance, current does not circulate back into the supply Fluctuations in current drawn by the load modifies via the feedback the resistor values : the power supply sees a constant resistance, current does not circulate back into the supply I ld Poor isolation High efficiency Good isolation Low efficiency (I loadmax to be provided by the supply) Regulators comparison Rutherford Appleton Laboratory Particle Physics Department G. Villani Powering Prague TWEPP SPSCT mm x 150 mm SPPCB mm x 83 mm SSPPCB / mm x 9 mm Hybrid SSPPCB ABCD3TV2 Serial powering circuitry evolution Rutherford Appleton Laboratory Particle Physics Department G. Villani Powering Prague TWEPP Serial powering stave implementation Initial stave work done by C. Haber LBNL Rutherford Appleton Laboratory Particle Physics Department G. Villani Powering Prague TWEPP Shunt regulator performances The shunt regulator in SSPPCB01 built around standard shunt TL431 Output boosted using PNP D45H8. The output is set to nominally 4V Stability analysis, output impedance Over current condition analysis Rutherford Appleton Laboratory Particle Physics Department G. Villani Powering Prague TWEPP Phase margin vs. I R esr [0.5, 2.5] I bias decreases phase margin ( g m increases) ESR affects forward feedback compensation ESR OLG CLG Stability analysis Rutherford Appleton Laboratory Particle Physics Department G. Villani Powering Prague TWEPP Output noise with C1,C3 10 f 16 v ceramic X5R 0805 pack Oscillation bias dependent Tektronix TDS3044B 400 MHZ Stability analysis Rutherford Appleton Laboratory Particle Physics Department G. Villani Powering Prague TWEPP Output noise with C1,C3 10 f 16 v ceramic low ESR A pack Implication was size of low ESR capacitor ( A pack ) Stability analysis Tektronix TDS3044B 400 MHZ Rutherford Appleton Laboratory Particle Physics Department G. Villani Powering Prague TWEPP Output Impedance analysis SSPPCB01 Hybrid QL 355 TP I sink AFG3252WR6100A A015 Output impedance and phase measurement Output impedance measured by applying a small sinusoidal varying signal to the driving current by means of a current sink and measuring the corresponding output voltage. From histogram of both peak-to-peak voltage and current the MPV value is determined Their ratio is taken to determine the MPV of output impedance, in the frequency range of 1HZ to 40MHz. From the histogram of the phase difference the output phase delay is measured in the same frequency range. Rutherford Appleton Laboratory Particle Physics Department G. Villani Powering Prague TWEPP Current and voltage f = 2 and 10MHz Output Impedance analysis Rutherford Appleton Laboratory Particle Physics Department G. Villani Powering Prague TWEPP SSPPCB01 Shunt regulator output impedance module | Z o |