CMOS Current-Mode Circuits for Data Communications (Analog by Fei Yuan

By Fei Yuan

This ebook bargains with the research and layout of CMOS current-mode circuits for facts communications. CMOS current-mode sampled-data networks, i.e. switched-current circuits, are excluded. significant topics coated within the ebook contain: a severe comparability of voltage-mode and current-mode circuits; the development blocks of current-mode circuits: layout strategies; modeling of twine channels, electric signaling for Gbps information communications; ESD safeguard for current-mode circuits and extra. This ebook will attract IC layout engineers, approach engineers and others.

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1) Distinct real poles - When R = - ^ , the amplifier has two distinct negative real poles located at pi = — ^^^^ and p2 = — c ^ - Observe that p2 is identical to the zero given hy z = — ^ ? ^ and cancels out the zero. As a result, the transfer function is simplified to H{s)=(^-jJ ^ . 32) 9ml As compared with the bandwidth of the basic current amplifier, the resistor series peaking with two distinct real poles boosts the bandwidth to ui = ^ ^ ^ . Note that if Cgs2^Cgsi^ the bandwidth improvement from resistive series peaking with two distinct real poles is rather small.

As a result, i^i 2 - 4 f c r ( 7 + Rgl,29ml,2)9ml,2^f. 5 for deep sub-micron devices, T is the temperature in degrees Kelvin, and k is Boltzmann constant. 18/im CMOS technology, the sheet resistance of silicided polysilicon (gate) is approximately 8^. lSjam with one-finger layout, then Rg^4A4kQ. 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.

42(b). 52) 9ml 9m2 Use the noise-current generator i^^ to represent the overall noise of the negative resistor. 43 directly with v'^n = Vn ^^d ^'^n = '^n'^ '^nr- Q-enhanced active inductors exhibit a high level of noise power. 42. resistors. 3. Noise equivalent circuit of Q-enhanced active inductors. 3 Dynamic Range The dynamic range of an active inductor is defined as the ratio of the maximum allowable signal at the terminals of the inductor to the root-mean-square (RMS) value of the noise power of the active inductor at the same nodes over the frequency range of the active inductor.

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