A Method for Measuring Transient Intermodulation Distortion (TIM)*
نویسنده
چکیده
A description of the square-sine intermodulation measuring method is given. The practical measuring procedure is described, and measurement results of commercial audio power amplifiers and integrated operational amplifiers are presented, in many cases showing appreciable transient intermodulation in units which have excellent total harmonic distortion and SMPTE intermodulation distortion specifications. The correlation of these measurements with results obtained using other methods, such as the CCIF-IM and the noise-transfer method, is treated, and the interdependence of these with the slew rate and the power bandwidth is discussed.
منابع مشابه
The Theory of Transient Intermodulation Distortion
The existing theory of transient intermodulation distortion (TIM) is extended to cover the calculation of the duration of intermodulation bursts. It is shown that feedback values in excess of some 40 dB will cause large internal overshoots within the amplifier. The clipping of these overshoots due to the limited dynamic margins of the amplifier driver stages is shown to give rise to long period...
متن کاملForms of Distortion
For many years there has been confusion surrounding distortion and its measurement. This paper will not discuss in detail the causes of “static” or “dynamic” distortion, or the many misconceptions surrounding their reduction or elimination. This has been done by others extremely well (Cordell 1979, Hofer 1980). Instead, a comparison of the distortion measurement techniques available today and t...
متن کاملImproving Linearity of CMOS Variable-gain Amplifier Using Third-order Intermodulation Cancellation Mechanism and Intermodulation Distortion Sinking Techniques
This paper presents an improved linearity variable-gain amplifier (VGA) in 0.18-µm CMOS technology. The linearity improvement is resulted from employing a new combinational technique, which utilizes third-order-intermodulation (IM3) cancellation mechanism using second-order-intermodulation (IM2) injection, and intermodulation distortion (IMD) sinking techniques. The proposed VGA gain cell co...
متن کاملComparison between nonlinear measurements in patterned and unpatterned thin films
This work compares two alternative methods of characterizing the nonlinearities in a 10 × 10 mm2 superconducting thin film. Both methods are based on measuring the intermodulation distortion in high temperature superconducting (HTS) films. The first method measures the unpatterned film by using a rutile loaded cavity operating at the TE011 mode. The second method is based on intermodulation mea...
متن کاملTechnical report: distortion product otoacoustic emissions that are not outer hair cell emissions.
PURPOSE To present a case study in order to alert clinicians to the possibility of occurrence of intermodulation distortion during otoacoustic emissions testing that arises from the cavity formed by the external auditory meatus and tympanic membrane rather than from the inner ear, compromising the reliability and validity of otoacoustic emissions testing. RESEARCH DESIGN Prospective case stud...
متن کامل