By applying switch-signal theory, the interaction between MOS transmission switching transistor and current signal in current-mode circuits is analyzed, and the theory of transmission current-switches which is suitable to current-mode CMOS circuits is proposed. The circuits such as ternary full-adder, etc. designed by using this theory can have simpler circuit structures and correct logic functions. It is confirmed that this theory is efficient in guiding the logic design of current-mode CMOS circuits at switch level.

DHT of length p^lq (p is odd. q is arbitrary) is turned into p-DHT's of length q and some additional operations while the additional operations only invol ves the computation of cos-DFT and sin-DFT with length p. If the length of a DHT is p₁^l₁…p_s^l_s2^l)(p₁,…, p_s are odd primes), a fast algorithm is obtained by the similar recursive technique. Therefore, the algorithm can compute DHT of arbitrary length. The paper also proves that operations for computing DHT of length N by the algorithm are no more than O(Nlog₂N). When the length is N=p^l, operations of the algorithm are less than that of other known algorithms.

An IOAOSA (Integrated Optical Acoustooptic Spectrum Analyzer) system consists of semiconductor laser, acoustooptic modulator, geodesic lenses, and CCD detector array. The optical signal is converted to electrical signal by CCD array of the IOAOSA processor, and then the signal is processed by the signal processing center which consists of TMS32010 system and IBM-PC. The TMS32010 is used in the microcomputer system. It has very high speed. A cyclic sample method is used to collect the data of the CCD video signal, sampling one point every 40 points. After processing, the frequency bandwidth. the resolution and the dynamic range of the system are measured to be 100MHz, 8MHz and 20dB respectively.

A statistical optimization method of integrated circuit design is proposed. This model summerizes optimal centering design of yield maximization, optimal tolerance, tuning design and maximum production profit design. The equivalence between this method and the general statistical optimization method is discussed, and the main features of the model are given. Based on the frame of deterministic optimization method, the general statistical optimization method can be improved further by the model proposed in this paper.

The exact numbers of n-variable Boolean functions with correlational immunity are initially found for the cases of weight 4(or 2ⁿ-4) and 6(or 2ⁿ-6). The known lower bounds for the enumeration of such Boolean functions are also improved greatly by the recursive algorithms.

A new approach, based on the fast Walsh transform and the waveform relaxation technique, is first presented to analyze the lossy coupled transmission lines with arbitrary terminations. The simulation accuracy of the method can be greatly improved, the disadvantage which always exists in previous methods can be avoided and a considerable saving in time and meory of CPU is obtained.

The TE and TM mode field expressions and their general coupled characteristic equations of the dielectric coaxial resonators (any number of interfaces) placed between two parallel conducting plates or placed in shield are derived. Particularly, the dielectric coaxial resonator (three interfaces) is studied and calculated in detail. And curves and tables of dominant mode and some higher-order modes resonant frequencies varied with the resonantor geometry and dielectric properties are given.

The impedance matching technique for twin-toroid latching ferrite phase shifter using grooved waveguide is studied. The transfer matrices used for impedance matching are given. Experimental results shown that tbe given technique is suitable for engineering design.

More stable and accurate recursive formulas and a computing procedure to calculate scattering coefficients for a multilayered sphere are proposed. The procedure involves three logarithmic derivatives of Ricatti-Bessel functions φ'_n(z)/φ_n(z), χ'_n(z)/χ_n(z),ξ'_n(z)/ξ_n(z), as well as the ratio φ_n(z)/χ_n(z). The asymptotic behavior, stability, and accuracy of the procedure and scattering coefficients a_n, and b_n are discussed for various complex refractive indices. This procedure can be applied to large and small inhomogeneous spherical particles.

Tolerance synthesis techniques of array radiation pattern are investigated. The mathematical models for array radiation pattern optimization are given, and the methods for solving the problem of tolerance optimization are initiated. The physical model for arbitrary tolerance distribution of array elements is presented. Numerical examples are given for the broadside array in which the excitation amplitude coefficients have tolerances. The methods given in this paper immunize optimally the resulting arrays against the deviations of the design parameters from their nominal values.

On account of narrow bandwidth, many applications of microstrip antennas are limited in great degree. How to widen its bandwidth is being concerned by lots of scholars at home and abroad. In this paper, resonant frequency of the deformed circular microstrip antennas is investigated based on variational principle and the perturbation concept. The theoretical results are found to be in reasonable agreement with the experimental ones for small modified element. This paper provides a theoretical and experimental bases for the synthesis of microstrip antennas.

A new method for reconstructing lossy medium by regression circle technique is presented. In high frequency region, the locus of the reflection coefficient as a function of the wave number in the complex plane yields a circle, from which some properties of the medium can be reconstructed without recourse to any numerical techniques. The method not only can be applied to the complex reflection spectrum but also can be adapted to treat the amplitude spectrum alone, therefore it makes the method more practicactical.

It is pointed out that methods usually used to measure and process S-parame-ters of reciprocal dissipative two-port networks can be used to any reciprocal lossless two-port networks. Therefore, the method of S-parameter measurement of these two kinds of networkscan be unified. Some examples of calculation and experiment are given.

The influence of laser pulse energy, laser pulse width, switch materiai absorption coefficient, surface recombination bulk recombination and Auger recombination upon the response time of photoconductive switch has been analyzed by using the computer numerical approach. Although the calculation shows that the mponse of photoconductive switch is very fast, there exists a short time lag.

De Bruijn sequences are highly important nonlinear shift register sequences. The homogeneous complexity C_k(ε) of degree κ of a De Bruijn sequence ε is defined and discussed. Its upper bound is given. The linear complexity and the quadratic complexity are special cases of C_k(ε) for k=1 and k= 2 respectively.

McEliece's public-key cryptosystem was constructed with the Goppa codes. This paper shows other linear block codes, i.e., BCH codes or RS codes, can also be used to construct secure McEliece s cryptosystem.

Based on circuitry of the long distance phase laser range finder with multi-frequency ranging, a new circuit for direct synthesis of frequency by means of a single crystal oscillator of high stability has been proposed Its advantages, performances and technical indices have been analysed. The design method for the circuit is proved to be feasible.

A new approach to get unilateral models for amplifiers is given. The transfer functions of such amplifiers are easily obtained by using the models. Compared with the traditional methods for determing transfer functions of amplifiers, such as the approximate method based on the Miller effect and the time constant method, the method presented in this paper is not only simple but also highly accurate.