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Triangular Waveform Signal Amplifier

IP.com Disclosure Number: IPCOM000081380D
Original Publication Date: 1974-May-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Mueller, FE: AUTHOR

Abstract

In servo systems, triangular waveforms are often generated and used during the control process. The frequency of the triangular signal will vary and is generally an indication of the velocity of a moving component within the servo system.

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Triangular Waveform Signal Amplifier

In servo systems, triangular waveforms are often generated and used during the control process. The frequency of the triangular signal will vary and is generally an indication of the velocity of a moving component within the servo system.

Triangular waveforms are generated by only the odd harmonics of the base frequency and classically, the amplifier used in the servo systems are of the type shown in Fig. 1 which has a frequency response gain plot, as shown in Fig. 2. The corner frequency as shown in Fig. 2 is generally the maximum frequency of the triangular waveform. However, since the triangular waveform is made up of only odd harmonics, significant loss of amplitude will begin to occur when the fundamental frequency rises above one-third of the bandwidth of the filter, since loss of the third harmonic will then occur.

In that the triangular waveform is used in conjunction with level detectors in most servo systems, it therefore becomes necessary to avoid this loss of amplitude as the frequency of the triangular waveform increases. Increasing the bandwidth of the filter will allow a higher fundamental frequency before loss of amplitude occurs, but this solution is undesirable for noise considerations.

Another approach to the solution of the loss of amplitude would be to increase the gain of the fundamental frequency, as that frequency reaches the corner frequency. Such a gain frequency curve is shown in Fig. 4 and is accomp...