This paper presents a modified regulated cascode (RGC) transimpedance amplifier (TIA) with a novel pre-equalized technique. The pre-equalized circuit employed the broadband series inductive π-network and Gm-boosting technique. The introduction of this technique compensates the transferred signal at the input port of the TIA without an increase in power dissipation. Furthermore, a novel miller capacitance degeneration method is designed in the gain stage for further bandwidth improvement. The TIA is realized in UMC 0.18 πm CMOS technology and tested with an on-chip 0.3 pF capacitor to emulate a photodetector (PD). The measured transimpedance gain amounts to 57 dBΩ with a −3 dB bandwidth of about 8.2 GHz and consumes only 22 mW power from a single 1.8 V supply.
Abstrac tA high bandwidth, lo w power consumption, low noise front-end amp lifier is designed based on standard 0.18u m SiGe BiCM OS process. This front-end amplifier consists of a high performance differential RGC TIA, a 3 stage post amplifier and a buffer. The single stage of post amp lifier is Cherry-Hooper amplifier. The entire circu it is simulated by a co mmercial software Cadence. The bandwidth and the differential t ransimpedence of the front-end amplifier are 13.22GHz and 87.3dBΩ with the input-referred rms noise current 1.71μA and the power consumption 38.6mW.
Compared with other nonlinear optical materials, KTP crystals have prominent advantages. However, they also have a high conductivity and become difficult to efficiently control domain-reverse with the conventional method, due to the existence of ionic current. To conquer the difficulty, it is necessary to monitor the polarization-reversal process of KTP crystals in real time. The real-time monitoring method in the fabrication of PPKTP, short for periodically-poled KTiOPO 4 , is carried out by utilizing electro-optical effect. The principle is analyzed theoretically and the result demonstrates the validity of the method experimentally. Compared with the result without using the monitoring method, the conversion efficiency of PPKTP crystal increases by many times. It is proved that this method can be used to enhance the quality and repeatability of PPKTP fabrication, and is also effective to examine the quality of PPKTP crystals.
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