Db - linear, process independent variable gain amplifier

摘要

Gate voltage control circuit with:a first mosfet (114), a gate, has a source and a drain;a feedback loop to:- a feedback transistor (120);- a first resistor (118), which is coupled in series between an emitter of the feedback transistor (120) and the drain of the first mosfet (114) is connected;- a feedback element (122), which is designed, in order to establish a linear current to a collector of the feedback transistor (120), wherein the feedback element (122) with the collector of the feedback transistor (120) is connected; and- an operational amplifier (116), which receives a feedback voltage from a node between the feedback element (122) and the collector of the feedback transistor (120), wherein the operational amplifier (116) supplies an output (109), which as a gate expensive voltage (110) is used, wherein the gate expensive voltage (110) to the gate of the first mosfet (114) is received, wherein the gate expensive voltage (110) the transconductance of the first mosfet (114) and of the first resistor (118); anda second mosfet (108), a gate, a source and a drain, wherein the second mosfet (108) to the first mosfet (114) is adapted, wherein the gate of the second mosfet (108) is connected to the gate expensive voltage (110) to receive.n="27"