The proposed converter with self-triggering pulses is more effective than the conventional one in terms of ripple noise and transient time because the sensing of signals in the
feedback circuit are periodically checked by the time-limited triggering pulses.
When input voltage is bigger than the limited, output voltage on AO changes its sing, diode opens,
feedback circuit is closed, and on the output of circuit is setting limited voltage.
The frequency divider FD2 in the
feedback circuit serves to increase the output frequency of the VCO.
The common mode
feedback circuit comprises a nMOS input stage differential amplifier and a pMOS input stage amplifier which are connected in parallel, and a push-pull CMOS amplifier for converting current outputs from the nMOS and the input stage differential amplifiers to an output voltage signal.
Therefore, in order to reduce the effect of "[V.sub.OS]" further, two low-offset operational amplifiers (see Figure 4) with self-contained
feedback circuit are employed in here to reduce the effects of PMOS current-mirror mismatch and its channel modulation without the decrease of supply power redundancy.
The functional block diagram of fluxgate signal processing circuit and picture of circuit board are shown in Figure 3, which mainly include field programmable gate array (FPGA) control unit, excitation circuit, detection circuit,
feedback circuit, and interface control circuit.
As Xiaolu Yang, PhD, professor of Cancer Biology and investigator in Penn's Abramson Family Cancer Research Institute, and his team describe, p53 participates in a molecular
feedback circuit with malic enzymes, thereby showing that p53 activity is also involved in regulating metabolism.(The Yang lab identified p53's role in glucose metabolism in the past.)
This is because the corresponding topology is restricted to a single type of a positive
feedback circuit.
If
feedback circuit is used to control arc current it is a difficult to achieve needed speed of reaction because of the fast voltage oscillation in welding arc.
feedback circuit - a circuit that feeds back some of the output to the input of a system