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A low noise multi-channel readout integrated circuit(IC) which converts a detector current to analog voltage for X-ray cargo inspection is described.The readout IC provides 32 channels of a circuit having a maximum dynamic range of 15 bit and is comprised of integrator gain selection,timing generator,shift register chain, integrator array,sample/hold(S/H) stage amplifier etc.It was fabricated using 0.6μm standard CMOS process, and occupies a die area of 2.7×13.9 mm~2.It operates at 1 MHz,consumes 100 mW from a 5 V supply and 4.096 V as reference,and has a measured output noise of 85μV_(rms) on 63 pF of integrator gain capacitance and 440 pF of photodiode terminal capacitance so that steel plate penetration thickness can reach more than 400 mm.
A low noise multi-channel readout integrated circuit (IC) which converts a detector current to analog voltage for X-ray cargo inspection is described. Readout IC provides 32 channels of a circuit having a maximum dynamic range of 15 bit and is comprised of integrator gain selection, timing generator, shift register chain, integrator array, sample / hold (S / H) stage amplifier etc. It has been fabricated using a 0.6 μm standard CMOS process, and occupies a die area of 2.7 × 13.9 mm ~ operates at 1 MHz, consumes 100 mW from a 5 V supply and 4.096 V as reference, and has a measured output noise of 85 μV rms on 63 pF of integrator gain capacitance and 440 pF of photodiode terminal capacitance so that steel plate penetration thickness can reach more than 400 mm.