CMOS current-mode circuits for data communications by Fei Yuan

By Fei Yuan

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M3 introduces a negative feedback to stabilize the input voltage, lowering the input impedance. The input impedance is given by Zin = 7-—^T-TT—• Note that the minimum supply voltage requirement of the current amplifier is Vr + Vsaty the same as that of the basic current amplifier. 3 Bootstrapping Basic cascode and regulated cascode current amplifiers are not particularly attractive for low-voltage design because in order to have a large output impedance, the biasing current source J2 in the output branch Design Techniques for Current-Mode Circuits 22 must also be cascode-configured.

Both the input and output impedances of the improved Wilson current amplifier can be obtained following a similar approach as that for Wilson current amplifier and the results are given by zin^-^ + ^ ; f ^ and Zo^(9miroi)ro4. 3(a). The amplifier stabilizes the output current io when Vo varies. The auxiliary 18 Design Techniques for Current-Mode Circuits amplifier can be implemented in various ways. 3(b) is an implementation using a common-source amplifier [30]. 3. (a,b) Regulated cascode current amplifiers; (c) Multi-regulated cascode current amplifiers.

Since the purpose of the second stage is to amphfy ici2^ not I02, this suggests that IDS should be kept small. 12, is added [42, 28]. 10. Simulated output current without the balancing network (Standard deviation of dimension=10%, 20 samples). 11. Simulated output current with the balancing network (Standard deviation of dimension==10%, 20 samples). current of M2 is given by i]j2 = ^i(^m + Ji) and that of M3 is given by ^D3 = ^iHn + (^1 — ^c)Ji- If we impose Ai — Ac = I and J2 = ^2^1? the output current is given by io = AiA2iin' In addition to the power consumption reduction, the chip area is also reduced due to smaller M3 and M4.

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