Chain amplifier with FETs contg. gate and drain lines - has active gate and drain loads, and source inductance with negative feedback to amplifying transistor

摘要

The amplifier consists of several FETs with corresponding gate and drain lines, with at least one gate and drain line coupled. The gate and drain loads are of active type, and at least one source inductance is in negative feedback to an amplifier transistor. Pref. the circuits of the gate and/or drain loads of the amplifier transistors contain transistors with negative feedback. Typically the gate and/or drain transisors are formed by diodes. Four transistors (T1-4) are typically in parallel, with a source inductance (LS1-4) linked to each transistor by a negative feedback. The drain terminal of one transistor (T1) is coupled to the active drain load, while the gate terminal of another transistor (T4) is linked to the active gate load. ADVANTAGE - Improved noise parameters.