Design On Special Signal Processing Circuit Of 2-D Position Sensitive Detector

Two-dimension position sensitive detector (2D-PSD) is a kind of component which is used to detect the position information of a light spot. Out put signal from the 2D-PSD is current signal which is relational to the position information. Signal processing circuit for PSD output signal is made up of ahead amplifiers, signal addition, subtraction and divide operation amplifiers. Because of the discreteness of device's performance parameter, it is very difficult to ensure the circuit's processing precision. And the circuit scale is so big that make the signals easily disturbed. Against these issues, this thesis designs a kind of integrated appropriative signal processing chip.For the sake of the ensuring output precision of the signal processing circuit under every kind of light intensity, the thesis designs a kind of variable gain amplifier. And design and emulate on every part which are used to be made up of the signal processing circuit, and then obtain a suitable circuit form and parameters. Based on these, according to the characteristic and simulation result of PSD signal processing circuit, we made the signalprocessing circuit integrated, and shown the circuit nucleus part -operational amplifier block and comparator block's design result, and studied on the integrated form of the signal processing circuit. To simplify integrated circuit's fabrication process, we present a method to make the bipolar circuit part and MOS circuit part integrated separately. That not only simplified the fabrication process, but also ensured the chip's optimum performance. At last discuss the part of layout design primarily.