Uncorrelated Noise Sources Research Articles

Computerized determination of electrical network noise due to correlated and uncorrelated noise sources

A new computation method is given connected with the analysis of equivalent circuits including uncorrelated as well as correlated noise sources, thus saving computer time.

Computationally efficient electronic-circuit noise calculations

The interreciprocal adjoint network concept is applied to the computer simulation of electronic-circuit noise performance. The method described is extremely efficient, allowing consideration of an arbitrarily large number of uncorrelated noise sources with less effort than for the original small signal a.c. analysis. Because all noise sources may be considered, no a priori assumption need be made as to which noise sources are dominant in a complicated circuit. The method is illustrated with an operational- amplifier example.

A new noise equivalent circuit for the junction FET with uncorrelated noise sources

A new noise model for the junction FET is evaluated. The calculations are based upon van der Ziel's noise model [1]; the results are valid above the 1/f noise region up to moderately high frequencies. Bias-dependent factors are computed for the pinch-off region. The advantage of the model is that all noise sources are uncorrelated.

Gain, Bandwidth and Noise in a Cavity-type Parametric Amplifier using an Electron Beam†

Abstract A modulated electron beam flowing across the gap of a resonant cavity can change the gap capacitance at the modulating frequency, thus producing the variable capacitance needed for a parametric amplifier. Such a beam-type parametric amplifier has boon proposed independently by the authors and by T. J. Bridges and has been constructed by Bridges. This paper presents an investigation of the gain, bandwidth, and noise figure which can be expected. It shows that complete cancellation simultaneously of the two uncorrelated noise sources in the electron beam, while feasible in principle, is virtually impossible in practice. The conflicting requirements of large beam current for acceptable capacitance variation and large plasma wavelength for optimum noise cancellation lend to practical minimum noise figures in the vicinity of 3 dB. A design example is worked out for an amplifier with pump frequency at 2000 Mc/s amplifying at 500 Me/s with a gain of about 15 dn. The resulting bandwidth is 4.3 kc/s. A no...