By Leo L. Beranek
Pages are fresh and binding is tight.
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Voltage feedback goes back from the output at the collector of T1 to the base via R1 , current feedback is performed by the emitter resistor RE . R1 and R2 bias the base-emitter voltage to create a certain collector current. For both versions: the corner frequency of the hp formed by C and the input impedance of the stage (≈ R1 or ≈ R1 ||R2 ) should be 100 times lower than the lowest frequency of interest. Than, the frequency and phase response of the stage will be flat within B20 k . Now, which one to chose?
1 and the following equation (see also Eq. 85) For MC purposes – in comparison with the BFW16A – the boxes marked bold show my favourite transistors for source resistances in the range of 20 – 50 R. To get a high SN for source resistances lower than 20 R I prefer the transformer solution (see the transformers chapter further down in Part I). Although, the BFW16A looks as if it could solve the low source resistance task I don’t like several facts with it: collector current very high, not so easy to get with relatively high hFE (out of 50 I only found 5 with hFE > 35, the rest was in the range 5 < hFE < 20, and to find a pair is a real tough task).
2 34 3 Noise Basics Excess Noise of Resistors At the end of this section I must come back to a resistor noise problem which only occurs when putting a resistor between two different voltage potentials. Doing so this means that a DC-current flows through the resistor, thus, producing a special kind of noise. ex . R = 4kT RB (B = fhigh − flow ). It has to be rms-added to this thermal noise voltage. 59) The nature of this excess noise is one which follows the 1/ f -law (= −10 dB/decade) and its plot voltage vs.