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CARIOCA Stability

8 channels. e. f. f. in. in. out. a. a. Preamplifier. Open loop Gain. CARIOCA Stability. One Channel. CARIOCA chip. Cdet. CARIOCA Stability. open loop gain simulation with hspice all transistors parameters 3 poles system dominant pole : input non dominant pole : n2

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CARIOCA Stability

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  1. 8 channels e f f in in out a a Preamplifier Open loop Gain CARIOCA Stability One Channel CARIOCA chip

  2. Cdet CARIOCA Stability • open loop gain simulation • with hspice • all transistors parameters • 3 poles system • dominant pole : input • non dominant pole : n2 • compensation capacitance of 400 fF Detector capacitance : 50 pF to 220 pF

  3. Negative polarity preamplifier Cdet = 50 pF PM = 79 deg Cdet = 220 pF PM = 59 deg Positive polarity preamplifier Cdet = 50 pF PM = 72 deg Cdet = 220 pF PM = 50 deg Phase margins…

  4. CARIOCA Stability • Robustness against • parameters spread due to process… • biasing fluctuation… • Simulating the layout • extracted view • all parasitic capacitances : wires, crosstalk,… • CARIOCA preamplifier is STABLE for BOTH polarities :-)

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