Suppression of spontaneous fluctuations in amplifiers and receivers for electrical communication and for measuring devices

Concurrent multiband low-noise amplifiers-theory, design, and applications

“…Strutt and Van der Ziel first noticed that inductive degeneration can enhance the output SNR [26]. The ideal lossless inductive feedback moves the source impedance for optimum NF toward the optimum power match with a minor increase in the minimum NF [27].…”

“…Having satisfied the above condition, the input impedance will be (2) Theoretically, a large number of passive topologies for and can provide input impedance matching at multiple frequency bands. One particular example which is of great practical value is when is just the intrinsic gate-source capacitance, and, hence, has to be an inductor as in the single-band common-source LNA in [26], [24], [23]. For negligible passive loss ( ) and a real-value impedance , (e.g., 50 for most practical cases), the source inductor is given by (3) This will result in a passive network for that will minimize for all the frequencies of interest.…”

Probing a Single Isolated Electron: New Measurements of the Electron Magnetic Moment and the Fine Structure Constant

“…At a time when the importance of feedback for reducing amplifier noise was already recognized [25], Kittel described the theory and limits of "noiseless" feedback damping [26]. Feedback damping has been applied in subsequent decades to a variety of oscillatory systems including an electrometer [27], a torsion balance [28], a mechanical gravity gradiometer [29], a laboratory rotor [30], a vibration mode of an optical mirror [31], and to the stochastic cooling of particle beams [32].…”

“…7b, applies feedback to the electron while canceling feedback to the amplifier. Feedback to the amplifier would modify its properties [25], perhaps improving particle detection in some situations [39], but would complicate the relationship between feedback gain, electron temperature and electron damping.…”

Reconfigurable Multi-Band OFDM UWB Receivers: Circuits and System Considerations

“…The primary issue in UWB LNA design is achieving low noise and impedance matching in a bandwidth spanning from 3.1 to 10.6 GHz. The classic solution adopted in narrow-band LNAs is the inductively-degenerated amplifier introduced by Van der Ziel [12]. To evaluate the limitations associated with a broad-band LNA we briefly revise the classic noise theory and derive the minimum achievable noise figure in an inductively-degenerated CMOS amplifier.…”