Column: Circuit drill Feature: Software & Tools
concluded that this peak detection circuit can’t deliver a stable output voltage when the input signal frequency changes. T e output signal matches the input only at specifi c input frequencies: 5kHz and 50kHz. T is limits the circuit’s use to applications where the input signal frequency is very stable. Also, the circuit amplifi es or attenuates
Figure 2: Output signal amplitude vs. input signal frequency
Amplifi cation eff ect: When the input signal frequency is between 5kHz and 50kHz, the peak detector circuit delivers an output signal with a magnitude higher than that of the input signal. T is amplifi cation eff ect is clearly seen in Figure 2; it is at its highest when the input signal frequency is 25kHz.
these examples that the LTspice’s UniversalOpAmp tool allows circuit designers to vary the voltage and current
Figure 3: UniversalOpAmp with stepped noise current – first three values
Attenuation aff ect: In contrast to the amplifi cation eff ect, the peak detector circuit delivers an output voltage lower than the input signal when the input signal’s frequency is above 50kHz. T e output signal amplitude is reduced exponentially, as seen in Figure 2. Based on these results, it can be
noise of a prospective amplifier to predict its added noise. Tis information then enables the designer to choose the most
the input signal based on the input frequency: it amplifi es it when the frequency is between 5kHz and 50kHz, but attenuates it when it rises above that level. T ese fi ndings are very important for
suitable amplifier for the application, meeting the intended noise requirements at optimum power consumption and cost.
circuit designers to know, since they must be fully aware of this circuit’s amplifi cation and attenuation eff ects at various input frequencies. It is also important to be aware of this circuit’s frequency instability when the input frequency is not fi xed.
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