Figure 5.9b gives the high-frequency equivalent circuit of the two-stage amplifier of Fig. 5.8. At midband frequencies and greater, the coupling and bypass capacitors C and CE have a very low reactance and can be replaced by shorts, but the shunting capacitances now become important and are...
PURPOSE: To control the gain of the input signal of an amplifier by appropriately controlling the voltage at one input terminal of a differential amplifier according to the input signal at the other input terminal and adjusting the gain of the amplifier by using a digital signal.HAKU TOUTETSU...
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In a gain-variable amplifier, a first differential amplifier is formed by first and second transistors having a common emitter connected to a first constant current source, a second differential ampli