Nonlinear distortion cancellation in class a junction transistor amplifier stages

Abstract

SUMMARYVarious sources of distortion in class A junction transistor amplifier stages are investigated using a unified method of analysis. Expressions for simultaneous cancellation of second and third harmonic distortions at low frequencies are derived giving the design relations between the source and load resistances together with the transistor operating parameters. High frequency effects are considered and a simple compensating method is devised to extend the gain-bandwidth product to the order of (;nCTcrvb).

Large Signal Analysis of Transistor Circuits with Feeback

“…the amplitude of a second-order intermodulation product of frequency ω, -ω, as [3][4] Using equations (5)-(9) expressions can be obtained for the different harmonic and intermodulation distortion components obtained from a two-tone test and defined as ΪΜ 3 = Y 2 ,\IY\, ΗΟτ, = Yj/Yi, IM 2 = ίί,ι/Ιί, HD 2 = Y 2 /Y,. Expressions can also be obtained for the other distortion components like the third-order intercept point IP 3 , defined as the input signal amplitude (usually a small signal level), where the extrapolated curves of Y 2 .\ and ίί coincide, and the second-order intercept point IP 2 , defined as the input signal amplitude (usually a small signal level), where the extrapolated curves of Υ ΙΛ and Ιί coincide.…”

Harmonic and Intermodulation Performance of Nonlinear Electronic Circuits

“…The knots are not necessarily equally spaced; this allows the choice of a lge number of ots to represent the fine details of the nonline input-output chactedsfic. By denoting the slope of each segment by , as shown in Fig(l), it is easy, following the procedure described by eyszig ( 7), to show, without peffong y integration, that the coefficients, ?2m+l, of the sine-series function of eqn(1) c be expressed by eqn(2).…”

“…The second approach involves a Taylor series expansion of an available, but untractable, mathematical expression about an operating point (6). The problem arises, however, when the mathematical expression available represents the input variable as a function of the output variable, where as what we would prefer is an expression for the output variable as a function of the input variable (7). This requires a series reversion to get the output variable as a function of the input variable.…”