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Implicit feed-forward compensated op-amp with split pairs
Disclosed are systems implementing an implicit Feed-Forward Compensated (FFC) op-amp, where the main FFC port is realized by the P-side of the CMOS input structure of the 2nd and 3rd stages of the op-amp, while the main signal path is through the N-side. According to some embodiments, to balance the relative strengths of the main path and feed-forward paths, the 2nd-stage NMOS input pair is split into two pairs, one is used to route the main path while the other is used for auxiliary FFC. The disclosed implicit FCC op-amp is unconditionally stable with adequate phase lead. According to some embodiments, the disclosed op-amp, which may be a wide-band op-amp, can be used in highly linear applications operative at intermediate frequency (IF), such as signal buffers for high-performance data converters or radio-frequency (RF) modulators and demodulators, continuous-time (CT) filters or sigma-delta data converters.Board of Regents, University of Texas Syste
Dominant Spin-Flip Effects for the Hadronic Produced Polarization at TEVATRON
Dominant spin-flip effects for the direct and prompt polarizations
at TEVATRON run II with collision energy 1.96 TeV and rapidity cut
, have been systematically studied, especially, the spin-flip
effect for the transition of into has been
carefully discussed. It is found that the spin-flip effect shall always dilute
the polarization, and with a suitable choice of the parameters
and , the polarization puzzle can be solved to a
certain degree. At large transverse momentum , for the prompt
is reduced by for and by for .
We also study the indirect polarization from the -decays, which
however is slightly affected by the same spin-flip effect and then shall
provide a better platform to determine the color-octet matrix elements.Comment: 19 pages, 5 figures. References added. Revised version to be
published in Phys.Rev.
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