• Non ci sono risultati.

Finally we decided for a cascode with feedback resistance thanks to its good trade-off between noise and stability

N/A
N/A
Info
Scarica
Protected

Academic year: 2021

Condividi "Finally we decided for a cascode with feedback resistance thanks to its good trade-off between noise and stability"

Copied!
1
0
0

Caricamento.... (Visualizza il testo completo ora)

Scarica adesso ( 1 pagine )

Testo completo

(1)

7. Conclusions

An LNA with variable gain and operating frequency band was designed. Many topologies were investigated with all their pros and cons. Finally we decided for a cascode with feedback resistance thanks to its good trade-off between noise and stability. The total current consumption was limited to about 9 mA with a very low supply voltage of 0.8 V for a total of only 7.2 mW of dissipated power. The noise was minimized by means of a high-Q input mesh, obtained with reactive (noiseless) components and by maximizing the gain (Friis formula): we managed to obtain a very good 1 dB NF in every high gain mode. We used an LC resonating load, due to its advantages like the band pass behavior, the low added noise and the high gain at the resonance frequency. A very important achievement is the good input matching, in all the considered frequency range, with the same external matching network. This implies a significant reduction in the fabrication costs, since the external components contribute considerably to the overall cost. As the new telecommunication standard UMTS requires a dual gain preamplifier, we implemented a low gain mode as well, that helps in improving the overall linearity of the receiver.

Riferimenti

Scarica adesso ( PDF - 1 pagine - 63.37 KB )

Documenti correlati

Validation of the noise prediction code Rnoise and reduction of trailing edge noise by Active Flow

In addition, an innovative idea to control and reduce noise emission is to alter directly the boundary layer structure and the wall pressure fluctuations that it originates,

First, we obtain the Ulam stability of adjoint equation by using the integrating factor method

Recently, Shah and Zada [24] obtained very interesting results about the exis- tence, uniqueness and stability of solution to mixed integral dynamic systems with instantaneous

For brevi ty, we orni t the statenents of dual prooositions, OOt if we rnust refer to them, we denote them by '.

images inaZude the point, i.e.. - Bv Prooosition 2, we have only to Drove that an o-regular function is c. o-regular iff ii) is true.. Then let f be a

lO So we obtain:

Then for every finite celZuZar decompo- sition C,C' of the pair S,S', with suitabZe mesh, there exists a func- tion h: S,S'~G,G' which is C,C'-pre-celZuZar and compZeteZy o-homo-.

Discussion and suggestions on design code provisions for seismic stability analyses of artificial slopes

1 Corresponding Author... étude détaillée, dans le but d'évaluer la situation de sécurité selon la nouvelle classification sismique nationale. Des analyses de la stabilité

With such preferences the demand for good 1 is

Determine the Cournot market

Finally, we obtain the expressions for the entropy function, the necessary conditions for its existence and the entropy 1-form, starting point to investi- gate an extended thermodynamical phase space

In this paper, taking in account the results obtained in [3]-[8], following [12]-[14] and [15]-[18], using the concepts of process and transformation, we construct a geometrical

If we dilate △A′B′C′ by −k and △A′′B′′C′′ by k/(1 − k), we obtain two equilateral triangles, respectively △LM N and △L′M′N′, oppositely oriented and concentric in the origin

The last equality in (??) follows from the fact that, since the origin O is the centroid of the triangle A, it divides the segment AH in such a way that.. |AO|