38 results about "Left half plane" patented technology

In the vehicle surrounding viewing system 1A, the light shielding member 27, that is coated on the areas other than the effective area of the surface of the prism 4 provided in the case 3, can transmit only the ray of light 18L, that enters into the transmit window 2L of the case 3, then passes through the prism side surface 8L, and then internally reflects at the prism side surface 8R, and subsequently is focused by the focusing lens 9 to be guided to the left half plane 10L of the image pick-up plane of the image pick-up element 10, and also the ray of light 18R, that enters into the transmit window 2R of the case 3, then passes through the prism side surface 8R, and then internally reflects at the prism side surface 8L, and subsequently is focused by the focusing lens 9 to be guided to the right half plane 10R of the image pick-up plane of the image pick-up element 10.

The invention discloses an operational amplifier, which comprises a first-stage amplifier circuit and a second-stage amplifier circuit, wherein the first-stage amplifier circuit is a single-ended output differential amplifier circuit; a grid of a first MOS (Metal Oxide Semiconductor) transistor and a grid of a second MOS transistor are respectively taken as a non-inverting input terminal and an inverting input terminal of the single-ended output differential amplifier circuit; a drain of an eleventh PMOS (P-channel Metal Oxide Semiconductor) tube is taken as an inverting output terminal and outputs a first-stage amplifying signal; an input end of the second-stage amplifier circuit is connected to the first-stage amplifying signal; and a seventh MOS transistor is connected to an output end of the second-stage amplifier circuit and provides current source load for the second-stage amplifier circuit. A second capacitor and the seventh MOS transistor form a feedforward path between the inverting input terminal of the single-ended output differential amplifier circuit and the output end of the second-stage amplifier circuit; the transconductance of the seventh transistor is arranged to be greater than the transconductance of the first-stage amplifier circuit, so that the operational amplifier forms left half plane zero to offset a pole in order to realize an effect of improving the stability of the circuit.

The invention discloses a common-mode feedback circuit frequency compensation method of a dual-stage amplifier, which belongs to the analog integrated circuit design field. One common-mode feedback circuit is adopted in the dual-stage amplifier to reduce the area and the power consumption of the feedback circuit; the dual-stage amplifier adopts a fully-differential input / output structure; a differential output terminal is used for sampling the common-mode output level; a first-stage amplifying circuit thereof comprises a controllable biasing circuit; a common-mode feedback control signal controls the first-stage common-mode output level and the second-stage common-mode output level of the amplifier at the same time through the controllable biasing circuit; a feedback amplifier is realizedby adopting a dual-stage operational amplifier with miller compensation. The left half plane zero point generated by the feedback amplifier in a loop circuit counteracts a certain left half plane pole in a prime amplifier, thereby forming a stable compensation loop circuit. The common-mode feedback circuit frequency compensation method has the advantages of less feedback circuit elements, lower feedback circuit power consumption, high low-frequency loop gain and better compensation phase margin.