By Fei Yuan
This ebook offers with the research and layout of CMOS current-mode circuits for info communications. CMOS current-mode sampled-data networks, i.e. switched-current circuits, are excluded. significant topics coated within the publication contain: a severe comparability of voltage-mode and current-mode circuits; the construction blocks of current-mode circuits: layout recommendations; modeling of twine channels, electric signaling for Gbps information communications; ESD defense for current-mode circuits and extra. This ebook will entice IC layout engineers, approach engineers and others.
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Additional resources for CMOS Current-Mode Circuits for Data Communications (Analog Circuits and Signal Processing)
2. Clearly in this case the noise of the nMOS transistor is dominated by the thermal noise of the gate series resistance. To reduce the thermal noise of the gate series resistance, the multi-finger layout approach becomes mandatory. Consider that 4 fingers are used for the transistor, we have L — 25iim for each finger. Because these fingers are connected in parallel, Rg^lAlkCl and Rg9m^^'5j which is comparable to the value of 7. 1 Basic Cascodes It was pointed out in the preceding section that the output error current of the basic current amplifiers can be minimized by maximizing the output impedance.
4- Pseudo-cascode current amplifiers. Note that in this case, J2 does not need to be implemented in cascode. The minimum supply voltage of the output branch is only Vr + Vsat- It can be shown that the output impedance of the pseudo-cascode current amplifiers is given by 2^0^(5^7713^03)^02- The added common-gate stage has no negative effect on the bandwidth. Pseudo-cascodes are self-biased, making them attractive for low-power applications. 5(a) to lower the supply voltage requirement while preserving the properties of the cascode current amplifiers.
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. To achieve a low input impedance, a large output impedance, and at the same time to keep the supply voltage low, bootstrapped current amplifiers were proposed in .