Abstract: The present invention relates to an analog integrated circuit. Specifically, a pseudo resistor calibration circuit configured for precise adjustment of pseudo-resistor resistance on a circuit. A reference resistor is generated by the switched capacitor correction circuit, and its resistance value is only related to the capacitance value of the switched capacitor and the switching frequency. Using a parallel-to-series circuit design scheme and a voltage integrator to extract the control voltage to control the pseudo resistance, a pseudo resistance which is X*Y*Z times of the reference resistance can be obtained. The resistance of the pseudo-resistor is accurately adjustable so as to achieve good robustness to PVT fluctuations and improved linearity compared to traditional pseudo-resistors.

Abstract: A catalyst supported with noble metal(s) for the isomerization of alkylaromatics consists of (1) 0.1-0.4 wt % of Pt or (2) 0.1-0.4 wt % of Pt or 0.2-0.8 wt % of Pd, 0.01-0.20 wt % of Re and 0.05-0.50 wt % of Sn as active component, and 10-60 wt % of a zeolite with MOR structure, 0-15 wt % of ZSM-5 zeolite and 40-80 wt % of alumina as support.

Abstract: A catalyst for the preparation of benzene, toluene and xylene from C.sub.9.sup.+ heavy aromatics consists of zeolite ZSM-5 and .gamma.- or .eta.-Al.sub.2 O.sub.3 as carrier, Re, Sn and Pt or Pd supported on the carrier. Under the conditions of 350.degree.-450.degree. C., 0.5-3.5 MPa, a WHSV of 1-5 h.sup.-1 and a H.sub.2 /HC ratio (v/v) of 500-1200, the catalyst achieves high activity and stability as well as low hydrogen consumption.