A Current-Reuse Low-Power LNA Operated in Moderate Inversion Region

920MHz current-reuse low-power LNA operated in moderate inversion region

“…The bias circuit not shown in Fig. 4 consists of a source follower type current source [25]. The input impedance of the second stage of this circuit and the output impedance of the first stage of this circuit are calculated in Eq.…”

“…( 1)-( 2), the gm/IDS of the weak inversion region is about three times larger than that of the pentode region. Therefore, LNAs with their transistors operated in the subthreshold regions have been studied [9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30]. As shown in Eqs.…”

“…Moreover, if 𝑄 𝐿 𝐺 is high, for instance using an external inductor (𝑄 𝐿 𝐺 = 40 ) , the difference between the minimum NF and NF in the saturation region is small but if 𝑄 𝐿 𝐺 is low, for instance using an on-chip inductor (𝑄 𝐿 𝐺 = 5, 10 ), the difference between them is large, so, it is necessary to be operated MI region in the case of the on-chip inductor is implemented. However, because the gain is low, a multi-stage amplifier is required, but this increases the power consumption, so a current-reuse multi-stage amplifier is being investigated [24,25,26,27,28,29,30,31,32].…”