Title :
A High-Sensitivity and Low-Walk Error LADAR Receiver for Military Application
Author :
Hong-Soo Cho ; Chung-Hwan Kim ; Sang-Gug Lee
Author_Institution :
Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea
Abstract :
An integrated receiver with high sensitivity and low walk error for a military purpose pulsed time-of-flight (TOF) LADAR system is proposed. The proposed receiver adopts a dual-gain capacitive-feedback TIA (C-TIA) instead of widely used resistive-feedback TIA (R-TIA) to increase the sensitivity. In addition, a new walk-error improvement circuit based on a constant-delay detection method is proposed. Implemented in 0.35 μm CMOS technology, the receiver achieves an input-referred noise current of 1.36 pA/√Hz with bandwidth of 140 MHz and minimum detectable signal (MDS) of 10 nW with a 5 ns pulse at SNR=3.3, maximum walk-error of 2.8 ns, and a dynamic range of 1:12,000 over the operating temperature range of -40 °C to +85 °C.
Keywords :
CMOS integrated circuits; error analysis; military radar; operational amplifiers; optical radar; radar detection; radar receivers; sensitivity; C-TIA; CMOS technology; MDS; R-TIA; TOF LADAR system; bandwidth 140 MHz; constant-delay detection method; dual gain capacitive-feedback TIA; high-sensitivity LADAR receiver; input-referred noise current; integrated receiver; low-walk error LADAR receiver; military application; military purpose pulsed time-of-flight LADAR system; minimum detectable signal; operating temperature range; power 10 nW; resistive-feedback TIA; size 0.35 mum; temperature -40 degC to 85 degC; transimpedance amplifier; walk-error improvement circuit; Dynamic range; Noise; Optical pulses; Optical receivers; Sensitivity; Timing; LADAR; laser detection and ranging; laser radar; optical receiver; rangefinder;
Journal_Title :
Circuits and Systems I: Regular Papers, IEEE Transactions on
DOI :
10.1109/TCSI.2014.2327282
