A kind of i/f conversion circuit

Abstract

An I / F conversion circuit, including sequentially electrically connecting an integral circuit, a comparison circuit, a digital logic control circuit, an electronic switch circuit, a constant current source circuit, and the electronic switch circuit is electrically connected to the integral circuit; that is, the integral circuit, the comparison circuit, the digital The logic control circuit and the electronic switch circuit form a closed-loop electrical connection; the constant current source electrical connection circuit and the electronic switch circuit. Its advantages are: the digital logic control circuit uses four times the working clock as the main working frequency, and through counting frequency division, NOT gate, or gate digital logic shaping, the circuit working clock signal is processed into a high-level and low-level ratio of 7 :1 clock signal can effectively reduce the non-linear error introduced by the non-ideality of the switching operation, and achieve the purpose of nonlinear correction; effectively improve the utilization rate of the constant current source of the conversion circuit, which is increased from 50% to 87.5%; the input range can be adjusted Significantly improved. It is widely used in many fields such as aerospace, aviation, inertial navigation, petroleum, construction, etc. It has a large potential demand and has huge economic and social benefits.

Description

technical field [0001] The invention belongs to the field of signal conversion circuit manufacturing, and in particular relates to an I / F conversion circuit. Background technique [0002] The I / F conversion circuit is one of the key devices in the inertial navigation system. It can linearly convert the output current signal of the accelerometer into a digital signal that can be recognized by the computer. The conversion accuracy of the I / F conversion circuit determines the accuracy of the inertial navigation. Its importance has been increasingly understood and valued by people. The digital logic control circuit is an important part of the I / F conversion circuit, and the digital logic control mode directly affects the conversion accuracy of the I / F conversion circuit. The I / F conversion circuit in the prior art has the following disadvantages: the conversion accuracy of the thick film hybrid integrated I / F conversion circuit is up to 1×10 -4 The magnitude and constant curre...

AI Technical Summary

Problems solved by technology

The I / F conversion circuit in the prior art has the following disadvantages: the conversion accuracy of the thick film hybrid integrated I / F conversion circuit is up to 1×10 -4 The magnitude and constant current source utilization rate can only reach 50%. The constant current source utilization rate is low, the input range is small, and the conversion accuracy is low, which cannot fully meet the needs of aviation and aerospace systems with high integration and high-end inertial navigation systems.

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