Column: Circuit drill


The impact of frequency changes on the clamper circuit


By Dr. Sulaiman Algharbi Alsayed, Managing Director, Smart PCB Solutions


Figure 1. The circuit will move the signal up or down, to position the peak at the reference level; see Figure 2. The input signal is shifted up by a predetermined magnitude, called “bias voltage”. There are many types of clamping


A


circuits: those that shift the input up are “positive biased” clamper circuits, and those shifting it down are “negative biased”. These circuits are also known as “DC voltage restorers”. Clamper circuits are found in many


applications, but are mainly used as voltage multipliers or to remove input signal distortions. Here we will determine how the DC


shift voltage is affected by a changing input frequency. This is an important question since some clamping circuits are designed to handle a specific range of input frequencies. Circuit performance and stability as frequencies change will impact the final design. We will also examine the circuit’s


behaviour at various bias voltage source values (V2).


The experiment For the experiment we use a typical op- amp-based clamper circuit, as shown in


08 September 2023 www.electronicsworld.co.uk Figure 2: Clamper circuit input vs output Figure 1: A typical op-amp-based clamper circuit


clamper circuit shifts an input to a defined offset voltage by adding a variable positive or negative DC voltage to it; see


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