LOOP COMPENSATION USING DIFFERENTIAL DIFFERENCE AMPLIFIER FOR NEGATIVE FEEDBACK CIRCUITS

摘要

A loop compensation circuit (500) includes a differential difference amplifier having a first transconductance stage (514) with a first input terminal and a second input terminal. The first input terminal is coupled to a voltage reference and the second input terminal is coupled to a feedback node. The amplifier also includes a second transconductance stage (516) having a third input terminal and a fourth input terminal. The third input terminal is coupled to a virtually specified fixed voltage and the fourth input terminal is coupled to a fixed specified voltage. The loop compensation circuit (500) also includes a feedback impedance (Zf) coupled between an output of the differential difference amplifier and the third input terminal and a second impedance (Za) between the third input terminal and the fixed specified voltage.