Triangle wave signal generation method and triangle wave generator

Abstract

The invention relates to a triangle wave signal generation method and a triangle wave generator. The generator comprises a triangle wave parameter processing unit and a triangle wave generating unit. The triangle wave parameter processing unit is used to process triangle wave parameters to obtain a frequency control word, a time threshold, and an amplitude coefficient. The triangle wave generating unit is used to generate a triangle wave signal according to information obtained by the triangle wave parameter processing unit. The triangle wave generating unit comprises: a phase accumulating module for accumulating the frequency control word once on a rising edge of a clock pulse TC of the triangle wave generating unit to generate a phase code; a comparison module for comparing the phase code and the time threshold obtained by the triangle wave parameter processing unit to generate a triangle wave mark; a selection module determining an output rising edge amplitude coefficient or a falling edge amplitude coefficient in a complement form in a time period according to the triangle wave mark generated by the comparison module; and a multiplication module obtaining the triangle wave signal based on the phase code and the amplitude coefficient output by the selection module.

Description

technical field [0001] The invention relates to the technical field of test and measurement, in particular to a method for generating a triangular wave signal and a triangular wave generator. Background technique [0002] The invention belongs to the technical field of test and measurement, and in particular relates to a method for generating a triangular wave signal. [0003] In the field of test and measurement, a triangular wave signal generator for generating a triangular wave is widely used. For example, electronic equipment in the fields of radar and communication needs a triangular wave signal with good linearity as a modulation signal or a reference signal. In a Class D audio power amplifier modulated by PWM, the triangular wave is used as an analog signal to be converted into a pulse signal. [0004] The main time-domain parameters of the triangle wave signal include amplitude, period, linearity, symmetry, etc. The linearity refers to the degree to which the edge ...

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Problems solved by technology

[0007] (1) The integrating circuit is composed of an operational amplifier and a number of resistors and capacitors. Due to the influence of non-ideal factors such as the limited gain, bandwidth and swing of the operational amplifier, as well as the thermal noise and process mismatch introduced by the resistors and capacitors, the integrating circuit is difficult. Generate high-performance triangular wave signals with good linearity and large signal distortion;

[0008] (2) The resistance taps of the variable resistor of the digital potentiometer X9241U are 64, and the limited number of taps results in low resolution of the symmetry of the triangular wave;

[0009] (3) The resistance range of the variable resistor of the digital potentiometer X9241U is 2KΩ to 50KΩ, that is, the symmetry of the generated triangular wave is up to 96%, and it cannot reach 100%.

Especially when the symmetry of the triangular wave is 100% or 0%, more harmonic components will be generated, which will affect the test effect of the triangular wave signal generator

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