Dual-mode design of fully differential circuits using fully balanced operational amplifiers

Fully differential (F-D) analogue circuits are usually designed focusing only on their differential-mode (DM) behaviour, without considering common-mode (CM) responses. A technique is presented for the design of both DM and CM circuit responses, using fully balanced operational amplifiers (FBOAs) as analogue building blocks. FBOAs work with CM and DM voltages as a whole, having an ideally infinite gain for both modes. This allows independent design of CM and DM dynamics. Inverting and non-inverting F-D topologies can be implemented in a simple way, similar to the implementation of their single-ended counterparts. Some typical application circuits are analysed and discussed and, as a design example, a 'double-mode oscillator' (a circuit that has independent CM and DM oscillations) was built and experimentally evaluated.     

Residue arithmetic using balanced magnetic circuits

Residue arithmetic and digital balanced magnetic circuits have been separate objects of research in the last ten years. This paper points out certain potentially interesting areas for them to be considered together. Following a review, the concept for a residue arithmetic unit capable of forming sums and products at the same time is described. A small balanced magnetic residue arithmetic unit was designed and built, and it displayed satisfactory margins and stability.     

The problem of analyzing errors in measuring systems

Summary In the operation of a linear measuring system with its elements subjected to various random external disturbances which produce in the elements additional static errors, transmitted to the output of the system together with the basic errors of the elements, a total static error is produced at the output. The latter error is the one which determines the accuracy of the measuring system under given conditions.If in experimental work the required variable is measured several times by means of a measuring system, whose elements are subjected to various random external disturbances, a statistical analysis of the measurement results may produce a certain compensation of the static measurement errors of this variable.     

斜齿轮误差的测量与计算

计算机技术的迅速发展，使坐标测量机被广泛地应用于各工业部门。文章提出了用坐标测量机测量渐开线圆柱斜齿轮各单项误差的想法，主要讨论由计算机采集的数据计算机采集的数据计算齿轮单项误差的方法。