Effect of the Input and Output Impedance on Amplifier Large-Signal Noise Performances

Garmendia, N.; Portilla, J.

doi:10.1109/tmtt.2011.2114673

Cited by 5 publications

(4 citation statements)

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“…ics 2022, 10, 470 device, simultaneously play a significant role in the input-outpu amplifier, such as the AM-PM response. In [13], it is shown that the dependence on the carrier power of AM and PM noise behavior in one stage could be linked to the derivatives of the AM-AM and AM-PM curves, evaluated in the steady-state regime forced by the particular carrier amplitude and frequency. Regarding the experimental results of the AM-to-PM correlation shown in Figures 11 and 12, the AM-to-PM derivatives were measured in both one-and two-stage amplifiers, and the results are reported in Figure 13.…”

Section: Discussionmentioning

confidence: 99%

“…The AM and PM noise power produced in one amplifier depend on the carrier level, both in the near-carrier and white regions of the carrier noise spectra [1][2][3][4][5][6][7][8][9][10]. For a given carrier frequency and power, different levels of flicker and white AM and PM noise can be obtained depending on device bias or matching conditions [12,13]. Measurement and simulation results have shown that AM and PM noise contributions are identical just in the white region of the noise spectra and only in the case of the amplifier working under linear conditions [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…For a given carrier frequency and power, different levels of flicker and white AM and PM noise can be obtained depending on device bias or matching conditions [12,13]. Measurement and simulation results have shown that AM and PM noise contributions are identical just in the white region of the noise spectra and only in the case of the amplifier working under linear conditions [12,13]. If this is the case, the noise figure (NF) coming from AM or PM noise spectra is equal to the standard NF, obtained from different characterization techniques such as Y-factor [14] or cold source [15].…”

Section: Introductionmentioning

confidence: 99%

“…If this is the case, the noise figure (NF) coming from AM or PM noise spectra is equal to the standard NF, obtained from different characterization techniques such as Y-factor [14] or cold source [15]. As carrier power grows, measurements and simulations have shown that both flicker and white noise contributions are not the same for the AM and PM cases [12,13]. In particular, flicker AM and PM noise power levels are different even when they are measured under a small signal regime.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of AM and PM Noise in Cascaded Amplifiers

Badillo

Portilla

2022

Electronics

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An experimental study of amplitude modulation (AM) and phase modulation (PM) noise spectra in cascaded amplifiers was carried out as a function of the number of amplification stages and the input power. Flicker and white noise contributions were determined, as well as effective noise figure (NF) from AM and PM noise spectra from small-signal to large-signal regimes. Simultaneous measurements of AM and PM noise were performed, and associated correlation was measured as a function of the offset frequency from the carrier. Measurements exhibited, in general, quite low AM–PM correlation levels both in the flicker and white noise parts of the spectrum. In some particular amplifier configurations, however, measurements showed some peaks in the correlation at some specific input power levels in the transition zone, from a quasi-linear to strong compression. The results show that the effective noise figure decreases with the number of stages for a given carrier output power level.

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Section: Discussionmentioning

confidence: 99%