摘要:

The current-voltage characteristics for the aniso-type heterojunction tunnel diodes taking into account the effect of interface states at the junction have been theoretically investigated. Tunnel diodes withn-Si/p-GaAs heterojunction have been fabricated and their electronic properties measured at various temperatures and frequencies. The experimental results are in good agreement with the theory. The heterojunction tunnel diodes have some inherent advantages but. the presence of interface states limits their applications.

ISSN:0020-7217    

DOI:10.1080/00207217508920371

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

The problem of matching a complex load impedance to a transmission line using a series matching transformer is considered. A method for obtaining a graphical solution of the transformer parameters is presented along with the equations for generating special graphs which make the solution relatively straightforward. Properties of these plots are also examined to illustrate the ease with which they may be generated.

ISSN:0020-7217    

DOI:10.1080/00207217508920372

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Distortion of an ionospherie reflected signal received by a bandpass receiver has been studied. The influence of receiver bandwidth upon the envelope of detected signals is also considered.

ISSN:0020-7217    

DOI:10.1080/00207217508920373

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

The paper describes an easy method for the detection and location of all single faults of the stuck-at-zero and stuck-at-onc type in a combinational network. It is shown that the test inputs can be applied in sequence to identify some of the faulty lines whose diagnosis is otherwise ambiguous. The faults on the rest of the network lines are diagnosed with an additional combinational network, which is virtually faultless. The design procedure for this cost-oriented additional logic block is discussed. An algorithm is included for the diagnosis of faultab initio.

ISSN:0020-7217    

DOI:10.1080/00207217508920374

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

The excitation of space-charge waves at a step in the doping density (n—vtransition) in a single-carrier semiconductor (Si or Ge) which is biased close to saturation in the drift velocity, and the influence of these waves on the electrical impedance, comprise the subject of the present paper. The assumptions and main results of a one-dimensional analysis are given. By taking reliable boundary conditions into consideration it is shown how it is possible to obtain a negative RF resistance across the weakly dopedvregion at frequencies somewhat smaller than multiples of the transit, time frequency. However, due to the series resistance of the less weakly dopednregion, the net RF resistance always seems to be non-negative in the analysed semiconductor structure.

ISSN:0020-7217    

DOI:10.1080/00207217508920375

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

The paper describes a Ternary flip-flop. The output is obtained in the form of three: levels of voltage corresponding to logic status 2, 1, 0, when triggered by 1 kHZ pulses.

ISSN:0020-7217    

DOI:10.1080/00207217508920376

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

The digital computer analysis of high-perveance charged-particle beams is reconsidered, with particular emphasis given to improving the efficiency of basic iterative processes. A novel technique used to provide excellent initial estimates of emitter currents is described, followed by a method to correct the first iterate of space-charge distribution computed from space-charge-free fields. The new techniques ensure rapid convergence of the overall numerical process.

ISSN:0020-7217    

DOI:10.1080/00207217508920377

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Thermally grown silicon dioxide films on silicon were examined for time dependent, breakdown. Measurements were performed on MOS capacitors with 1100 A oxide thickness with positive voltage on the metal. A time dependent breakdown mechanism was found, which could be described as a time to breakdown,τBD and a maximum breakdown probability, reached at. times much larger thanτBD. It was furthermore found thatτBD could be writtenτBD~exp (Qo — ∞ √E)/kT and that 25 V appeared to be a lower limit of the breakdown voltage. A possible explanation is proposed. Sodium tons are assumed to drift to the silicon surface, piling up at that surface, thus lowering the barrier for Fowler-Nordheim electron injection.

ISSN:0020-7217    

DOI:10.1080/00207217508920378

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

The problem of wave reflection and refraction at a moving magnetized plasma slab has been treated for arbitrary angles of incidence. The external magnetic field has been taken normal to both the plane of incidence and the direction of motion of the slab. Expressions are obtained for the phase shifts and the power reflection and transmission coefficients for both an incident E-wave and an incident H-wave. It is found that as against the case of a moving magnetized or unmagnetized plasma half-space, there is a finite transmission through the plasma slab at a cut-off point (kpe = 0). Further, for a moving plasma slab some unique Brewster's angles are shown to exist. For an isotropic plasma slab, in particular, the Brewster's angles are independent of the velocity of the slab medium and exist only for plasma frequencies less than the signal frequency (ωp < ω). In addition, the various reflection and refraction properties for an incident E-wave turn out to be independent of magnetic field strength and the velocity of the slab. Numerical results on the reflection and the transmission coefficients are presented for some representative values of the physical parameters.

ISSN:0020-7217    

DOI:10.1080/00207217508920379

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Beginning with a survey of the appropriate literature, the author shows that extant linear theories of phenomena in microwave electron-beam devices are of two types : (a) theories based upon field-theoretic models, attended by formidable analytical difficulties : and (b) transmission-Line theories, with much simpler mathematical structure, but which (being one-dimensional) do not yield the field vectors. With the aid of a somewhat artificial but geometrically and physically simple new (but non-periodic) model for the slow wave guide (affording very simple boundary conditions), the author defines and develops some properties of field-theoretic models which preserve much of the mathematical simplicity of tranamission-line theories, This is shown, in particular, that theories based upon his model are in general agreement with existing theories. The author then applies his model to solve the case of non-vanishing a.c. transverse velocity components in the beam, an d the resulting theory predicts the existence of an unexpectedly large number of waves in the beam, and-field system. The paper concludes with brief mention of some properties of theories based upon this new model in the case of multi-valued d.c. velocities in the beam, and on its modification into an actual periodic structure. (The important mathematical tools used are the Laplace transform and the theory of solutions of Hill's equation.)

ISSN:0020-7217    

DOI:10.1080/00207217508920380

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor