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Electromagnetic wave detection arrangement with capacitive feedback

  • US 7,173,230 B2
  • Filed: 09/05/2002
  • Issued: 02/06/2007
  • Est. Priority Date: 09/05/2001
  • Status: Expired due to Term
First Claim
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1. An electromagnetic radiation detector comprising:

  • a detector configured to detect electromagnetic radiation;

    an amplifier stage coupled to the detector, the amplifier stage including;

    an operational amplifier having an inverting input and an output, wherein the detector is connected to the inverting input of the operational amplifier and the operational amplifier has a open loop gain of about 25 dB to about 50 dB and a unity gain bandwidth of about 1 MHz to about 1 GHz, anda capacitive structure coupled between the output and the inverting input of the operational amplifier to cancel at least a portion of an intrinsic capacitance of the detector, wherein the capacitive structure has a capacitance of about 5 fF to about 100 fF; and

    a biasing stage coupled to the detector and the amplifier stage, wherein the biasing stage is configured to apply a voltage to the amplifier stage to charge the capacitive feedback and to reverse bias the detector; and

    wherein characteristics of at least one of said capacitive feedback and said amplifier stage cause a reduction in at least one of 1/f noise and kT/C noise in said electromagnetic radiation detector.

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