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

By Fei Yuan

This publication offers with the research and layout of CMOS current-mode circuits for information communications. CMOS current-mode sampled-data networks, i.e. switched-current circuits, are excluded. significant topics lined within the publication contain: a severe comparability of voltage-mode and current-mode circuits; the development blocks of current-mode circuits: layout thoughts; modeling of cord channels, electric signaling for Gbps info communications; ESD safeguard for current-mode circuits and extra. This booklet will attract IC layout engineers, method engineers and others.

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Grounded Gyrator~C active inductors. 28. It is evident that the gyrator is resistive when u < ujz, inductive when Uz < UJ < tOo, and capacitive when u > ujo' Also, Rp has no effect on the frequency range of the active inductors, whereas Rs sets the lower frequency bound. To maximize the frequency range over which the gyrator is inductive, uJz should be minimized and LUQ should be maximized. The quality factor Q of the inductor quantifies the ratio of the net magnetic energy stored to the energy dissipated by the inductor in one oscillation cycle [55, 75].

When a large positive input current is applied at the input (the current fiows into the channel), the voltage of the input node arises sufficiently high such that the pMOS current mirror is disabled. The input current is sensed by the nMOS current mirror. 24- Current amplifier with both current-current feedback and resistor series peaking. 25. Simulated frequency response of current amplifiers with both current-current feedback and resistor series peaking, (a) Basic current amplifier; (b) Resistor series peaking; (c) Current-current feedback; (d) Resistor series peaking and current-current feedback.

If Goi,2 = 0 and C2 = 0, we have Rg = 0, Rp = 00, and Cp = 0. Port 1 of the gyrator behaves as a lossless inductor. To find out the effective frequency range over which the gyrator is inductive, we examine the impedance looking into the inductor Rs \ 5^7 + 1 \IxpCp L J RpCpL When complex conjugate poles are encountered, the impedance has its self-resonant frequency at ^o'^\ hzed and ijJti,2 = ^Sff j ^ = \/^n^t2j where Rp^Rs was uti- ^^ ^^^ cut-oflF frequency of the transconductors. Observe that Z{s) has a zero at the frequency ujz — ^ —^ .

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