I need someone for a quick work next week (max 40 mins long) with a good knowledge of the circuit technology of transistors and complex electronic modules (eg operational amplifiers).

You have to know: Basic characteristics and operations of bipolar (BJT) and field effect (FET) transistors. Biasing of active devices. Current mirror. Maximum output signal analysis of the transistor circuits. Power amplifiers; A, AB, B power stages. Small signal analysis of common base (gate), common emitter (source), common collector (drain) amplifier stages. Frequency response of the amplifiers. High frequency small signal models, the Miller-effect. Low frequency analysis of the transistor circuits. Two-transistor basic amplifiers. Differential amplifier, cascade stage. Differential amplifier: large signal analysis and transfer characteristics. Ideal operational amplifier, basic circuits. Structure of the operational amplifiers. Parameters of a non-ideal operational amplifier, The effect of the feedback to the small signal parameters. Frequency compensation of the feedback amplifiers. Comparator circuits. Sample and hold circuits.