Suspension difference active inducer based on positive feedback

Abstract

The invention relates to a suspension difference active inducer based on positive feedback, belonging to the technical field of active inducer design, comprising a difference impedance converter, a positive transconductance stabilizer and a negative transconductance canceller, wherein the difference impedance converter comprises two pairs of difference impedance converters composed of two pairs of interconnected PMOS (positive channel Metal Oxide Semiconductor) transistors based on the positive feedback and two capacitors, wherein the two capacitors are converted into the suspension difference active inducers by the two pairs of difference impedance converters; the positive transconductance stabilize comprises two PMOS transistors for compensating the negative impedance of the impedance converters and solving the stability problem of the active inducer; and the negative transconductance canceller comprises two pairs of interconnected PMOS transistors for canceling the parallel impedance of the active inducer. The suspension difference active inducer uses the current multiplexing technology and only comprises the PMPS transistors, so the structure is symmetrical and simple; and thevariation of the high-low quality factor (Q) is simple. The inducer provided by the invention is used for replacing the suspension difference inactive inducer, and specifically for designing the active filter by an induction replacing method.

Description

technical field [0001] The invention relates to a suspension differential active inductance based on positive feedback, and belongs to the technical field of active inductance design. Background technique [0002] Filters are essential modules in various communication systems, such as IF filters in radio frequency transceivers. figure 1 (a) shows a third-order single-ended structure based on an inductance-capacitance ladder filter (LC Ladder Filter), in which both ends of the passive inductance V 1 and V 2 It can be in the same phase. At this time, the passive inductor is a floating single-ended connection. figure 1 (b) gives figure 1 (a) The corresponding differential structure, mainly because the differential structure is beneficial to improve linearity and suppress common-mode noise. The floating connection between the first port and the second port of the passive inductor, each port is a differential structure, the positive end of the first port and the negative end ...

AI Technical Summary

Problems solved by technology

Even considering only the positive transconductance of the four transistors, figure 2 The shown floating differential active inductor based on negative feedback requires 16 transistors. In addition to the number of transistors required for other considerations, usually the floating fully differential active inductor based on negative feedback requires more than ten transistors, making the traditional floating differential active inductor design Complex, and the design of high and low quality factor (Q) changes based on negative feedback suspension differential active inductance is complex

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