By Cornel Turcu (Ed.)
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Second, it should be a low power implementation with high power gain. 13a specification  , it is required a power gain of at least 15dB with less than 3dB noise Fig. Since, one of the biggest applications of UWB systems is low-power implementation, the LNA should be able to operate in low supply voltage. The third issue is gain flatness to avoid any signal distortion over such a wide bandwidth. In terms of wideband impedance matching, the most popular methods are the feedback topology, the distributed impedance matching, the BPF configuration matching network, and the common-gate topology.
Fig. 4. Common-source stage with RC-load. When no inductor is used, the only available load is RC-load, thus the load amplifier becomes: ZL R 1 RCs (1) 19 Main RF Structures The circuit topology of Fig. 4 is well known and corresponds to a low pass filter configuration. The frequency response of this filter is shown in Fig. 5 and its gain is given by: Av gm R 1 RC (2) Fig. 5. Frequency response of Fig. 4. Hence, the DC gain is -gmR and the bandwidth is ω1 = 1/RC. The frequency ω1 is called “uncompensated bandwidth”.
Condition i-v characteristic Output resistance vDS ≥ vGS - Vt. 1 W iD nC ox ( L 2 1 V ro A iD iD v gm 2 nC ox Saturation Transconductance GS Vt )2 W iD L W ( GS Vt ) L iD gm 2 ( GS Vt ) v gm nC ox v Triode Body transconductance gmb gm Condition vDS < vGS - Vt. i-v characteristic iD nC ox Output resistance rlinear Threshold voltage Vt Vt 0 [ 2 f VSB 2 f ] v W [( L DS iD 2 2 f VSB v GS v Vt ) [ nC ox W ( L gm DS v GS v 2 DS 2 ] Vt )]1 Table 1.
Current Trends and Challenges in RFID by Cornel Turcu (Ed.)