Modified derivative superposition method for linearizing FET low-noise amplifiers

A high linearity and high gain Folded Cascode LNA for narrowband receiver applications

“…Fig. 3 shows the realization of MDS technique proposed for the CS stage of a Source Degenerated LNA [9]. The MOS device in the CS stage and the degenerating inductors are split into two (M 1 and M 2 ) and (L 1 and L 2 ) respectively.…”

“…In source degenerated FC LNA [8], feedback of second-order non-linear component due to degeneration inductance contributes to third order non-linearity. Modified Derivative Superposition (MDS) technique is proposed in [9] for source degenerated LNAs to achieve high linearity. In this paper, to improve the linearity of the source degenerated g mboosted FC LNA [8], MDS technique is adapted at the Common Source (CS) stage, thereby a high gain and high linearity can be achieved for the LNA.…”

A broadband Low Noise Amplifier with built-in linearizer in 0.13-µm CMOS process

“…The DS method has the following drawbacks. First, it is valid only at low frequencies at which the effect of circuit reactance is negligible [15]. Second, to obtain linearity in DS method, one transistor is biased in weak inversion region so this transistor degrades noise figure of the LNA due to its high gate induced current noise getting added to the input [16].…”

“…In DS technique the auxiliary transistor which is biased in the weak inversion region connected to the main transistor and hence, degrades the input matching (due to parasitic capacitances) and NF (due to the gate-induced noise) of whole LNA. To overcome these shortcomings, the modified DS (MDS) was proposed in [13][14][15]. Additionally, MDS method can eliminate the g m ' in order to achieve high linearity.…”

Harmonic and IMD frequency components affecting nonlinear distortion with feed back in MOSFET amplifiers

“…Based on the dameging feedback effects discussed in [2] and [4] in terms of contribution to intermodulation products, and in order to analyse all these possibilities, a mathematical analysis was performed using a seventh-order polynomial for representing the nonlinearity of an assumed amplifier where up to 7 th order nonlinearity is significant. The procedures work as follow: A twotone signal of the form…”