Wideband, linear, transistorized cable driver

TL;DRAbstract

This report contains a theoretical analysis and an experimental verification of a transistor, wideband, linear cable driver having a complementary emitter-follower output stage which included in an overall series feedback loop. The analysis is concerned with bandwidth, gain stability, drive capability, input impedance, and output impedance. The complementary emitter-follower output stage is analyzed for two quasilinear modes of operation. The resistive and capacitive contributions of the first stage hybrid-pi parameters to the input impedance are found separately. The effects of an active, dc feedback loop on the stability of the quiescent operating levels, the low-frequency performance, and the output dc voltage are investigated. The experimental results are in excellent agreement with derived quantities. The driver is capable of driving +2 volts linearly across 93 ohms with a 19 nano-second 10 to 90% rise-time. The input capacitance does not exceed 4 pf. The input resistance becomes

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