LA 124 20 Amplifier, In-Line
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Product review & video
okay in this lecture we're going to start to really distinguish what makes a power amplifier different than other types of amplify amplifiers such as a low noise amplifier when we design a low noise amplifier we start with a transistor and we have an impedance matching network that transforms fixed impedance to the desired impedance at the LNA and generally the desired impedance at the LNA is the conjugate of the impedance looking into the transistor drain typically when we look into a transistors drain we see some real part R sub D and some capacitive part of the impedance J Omega C sub D and so we design a matching Network that for instance transforms 50 ohms to our D plus J Omega C D this type of match is called a conjugate match and it maximizes the gain or power transfer so what makes a power amplifier different is we have essentially the same thing we have a transistor that might
