Talk:Translinear circuit

Biasing

I have been working on this passage:
The alternating translinear loop is also called type A and the stacked loop called type B. In realizing the principle the first difficulty lies in biasing the BJT in such a way that the transistors can follow the principle while carrying the intended currents. For every pair of base connected transistors only one may have it's collector connected to it's base in diode connection and the input current set by the collector potential but the other may not be biased in the same way. Both type A and B realize the same mathematical function with the difference being the voltage between the two nodes of which at least one is an emitter to emitter connection. [what nodes?]. For type A (alternating), with two emitter connected transistors, the voltage relates to the ratio between the currents within each base coupled pair. For type B (stacked), with one emitter and one base connected pair, the node voltage is the sum of the base emitter voltages and thus relates to the product of currents in each stacked base to emitter coupled pair. Thus if the voltage is forced in either case two currents, one in each pair, must be variable. In the type A example below a MOSFET allows the correct tiny voltage between the emitter nodes of the emitter coupled pairs due to negative feedback, because a higher collector/gate voltage lowers it's resistance such that, the base emitter voltage of the output BJT is small enough to let it out of saturation.
Sadly I understand the biasing and input, output too little. --Moritzgedig (talk) 18:56, 11 December 2023 (UTC)