Jul 29, 2016 · Electronic Devices and Circuit Theory, 10/e Robert L. Boylestad and Louis Nashelsky BJT Amplifier Low-Frequency Response The Bode plot indicates that each capacitor may have a different cutoff frequency. It is the device that has the highest lower cutoff frequency (fL) that dominates the overall frequency response of the amplifier. 9 10.. • Also, cascading amplifiers limits the gain at high and low frequencies. Frequency Response: The frequency range in which an amplifier will operate with negligible effects from capacitors and device internal capacitances; often called the mid-range. General Frequency Considerations. Figure 1. Common emitter BJT amplifier. Low Frequency Response. Figure 2 shows the low frequency, small signal equivalent circuit of the amplifier. Note that C F is ignored since it is assumed that its impedance at these frequencies is very high. R B is the parallel combination of R B1 and R B2. "/>The low frequency response of a bjt amplifier is affected by