×

Imaging array having variable conversion gain

  • US 20070007438A1
  • Filed: 07/06/2005
  • Published: 01/11/2007
  • Est. Priority Date: 07/06/2005
  • Status: Active Grant
First Claim
Patent Images

1. An amplifier comprising:

  • an operational amplifier having an input and an output port and a variable feedback capacitor connecting said input and output ports, said variable feedback capacitor having a feedback capacitance determined by a gain control signal, said operational amplifier generating an output signal on said output port related to said feedback capacitance and a charge coupled to said input port;

    a reset path between said input and output ports, said path having an impedance controlled by a reset signal; and

    a controller that generates said gain control signal and said reset signal during a charge measurement cycle, said controller generating said reset signal prior to a charge to be measured being transferred to said input port, said controller initially setting said feedback capacitance to a first capacitance value after generating said reset signal, and said controller changing said feedback capacitance from said first capacitance value to a second capacitance value during said charge measurement cycle if said output signal exceeds a first threshold value.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×