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A 14bit MDAC with 120MS/s conversion rate, in 0.35um CMOS technology is presented. The MDAC consumes a power of 36mW from a 3.3v power supply and its settling time is 7ns. It utilizes a new high speed, high gain Op Amp, with 102dB gain, and 1.2GHz bandwidth. The phase margin of Op Amp is 51° and its settling time is 5ns for feedback gain of 8. The Op Amp has a good linearity of -60dB.
This paper presents a high performance readout circuit for Infrared detector. The circuit is composed of capacitor trans-impedance amplifier (CTIA) and correlation double sampling (CDS) circuit. The CTIA structure is used to convert the photo-current into voltage, and could obviously improve the readout accuracy of weak current signal. And the CDS structure is used to reduce the fixed pattern noise...
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