摘要：The short-pulse TDMA signal is an excellent solution to the near-far problem in the pseudolite augmentation systems,and the pulse duty cycle is an important element in the *** paper aims at designing the duty cycle of the pseudolite pulse signals with a theoretical *** first,the scope of the duty cycle is derived theoretically with the object of ensuring the reception of both the pseudolite signals and the satellite signals,and the expression for the theoretical upper limit is *** based on the proposed expression,the duty cycles of Galileo pseudolite pulse signals are *** theoretical upper limit can guide the design of the short-pulse TDMA pseudolite signals.

摘要：To prevent sub-harmonic oscillation and improve the stability and load capacity of the system,a piecewise linear slope compensation circuit is designed. Compared with the traditional design, this circuit provides a compensation signal whose slope varies from different duty cycles at - 40-85℃ ,and reduces the negative effect of slope compensation on the system＇s load capacity and transient response. A current mode PWM Boost DC-DC converter employing this slope compensation circuit is implemented in a UMC 0.6μm-BCD process. The results indicate that the circuit works well and effectively,and the load capacity is increased by 20%. The chip area of the piecewise linear slope compensation circuit is 0.01mm^2 ,which consumes only 8μA quiescent current,and the efficiency ranges up to 93%.

摘要：A novel SPIC(smart power IC) with a simple APFC(active power factor correction) circuit on one chip is *** V _ bus (bus voltage) with high power factor falls from 600V to 400V by using a delay circuit in which a long channel length NMOS is used to substitute a large biasing resistance to save chip *** lower V _ bus results in a smaller R _ on (on-resistance) of power switcher,which reduces the power loss of the power devices,improves the efficiency of the circuit,and reduces the cost of *** integrated high voltage over voltage protect circuit is also designed in the *** and simulations both prove the correctness and availability of the design.