High-precision current/frequency conversion circuit and conversion method based on triangular wave modulation

Abstract

The invention relates to a high-precision current / frequency conversion circuit and a conversion method based on triangular wave modulation, the high-precision current / frequency conversion circuit includes a main integrator, the input terminal of the main integrator is an input current terminal, the output terminals of the main integrator and the triangular wave generating circuit are connected with the input terminal of the comparator, the output of the comparator is connected to one input of the digital processing circuit, the two output terminals of the digital processing circuit are respectively connected with the control terminal of the ultra-high speed switching circuit and the input end of the output circuit, the input end of the ultra-high speed switching circuit is connected with the output end of the constant current source circuit, the output end of the ultra-high speed switching circuit is connected with the input end of the main integrator, the output end of the shaping circuit is connected with the other input end of the digital processing circuit, and the input end of the shaping circuit is connected with the output end of the triangular wave generating circuit. The invention solves the problems that the debugging is difficult in the current production debugging process, the debugging personnel are required to be high, and the batch production demand cannot be met.

Description

technical field [0001] The technical field of the analog-digital hybrid circuit of the present invention specifically relates to a high-precision current / frequency conversion circuit and a conversion method based on triangular wave modulation. Background technique [0002] The current / frequency conversion circuit is one of the important components of the inertial navigation system. It is used together with the accelerometer in the inertial navigation system to convert the output current of the accelerometer into a digital pulse signal proportional to it. At present, the current / frequency conversion circuit using the principle of charge balance is widely used. In the traditional method, the threshold level compared with the main integrator adopts a fixed threshold level. When the input current signal is large, the number of constant current source switching is relatively large. Since the transition time in the switching process of the constant current source is the main facto...

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Problems solved by technology

At present, the current / frequency conversion circuit using the principle of charge balance is widely used. In the traditional method, the threshold level compared with the main integrator adopts a fixed threshold level. When the input current signal is large, the number of constant current source switching is relatively large. Since the transition time in the switching process of the constant current source is the main factor affecting the conversion accuracy, its accuracy is difficult to achieve the ideal target, and compensation or digital calibration methods are usually used to compensate, but the process is complicated, the debugging workload is heavy, and the requirements for components are high.

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