Differential interpolation pulse width modulation digital-to-analog conversion device and method
A technology of pulse width modulation and digital-to-analog conversion, which is applied in the field of iPWM-DAC devices that generate high signal-to-noise ratio, and can solve the problems of pulse shortening and short pulse width.
Active Publication Date: 2016-12-21
TRITAN TECH INC
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[0034] As shown in Equation (16) above, the minimum time resolution must be 122 ps to ensure that the signal-to-noise ratio is greater than 100 dB, which is a very short pulse width for differential PWM implementations, and may cause two problems
The first question is how to generate such a small pulse with low power consumption and low cost, and the second question is that the next stage of the differential PWM output is the power driver, because such as Figure 10 The dead-time shown and the parasitic capacitance of the MOS will make this short pulse shorter when the signal passes through the power driver
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[0078] Figure 11 A schematic diagram of a differential interpolating pulse width modulation (iPWM) digital-to-analog converter (DAC) of the present invention is shown. like Figure 11 As shown, the differential iPWM DAC includes an interpolation pulse width modulation (iPWM) module 1110, a power driver 1120, and a filter 1130, the iPWM module 1110 is connected to a digital audio input, and the filter 1130 is connected to to a terminal load 1140, eg, a speaker. The iPWM module 1110 generates differential pulses according to the file stream from the digital audio input, the power driver 1120 provides energy to the terminal load 1140, and the filter 1130 removes unwanted harmonic signals to reconstruct the analog output to the terminal load 1140 Signal. The iPWM module 1110 further includes a pulse width modulation (PWM) generator 1111, an interpolation resolution unit 1112, a self-calibration unit 1113, and a differential pulse width generator 1114, wherein the PWM generator...
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This invention discloses a digit simulation conversion device and a method for differential type interpolation pulse width modulation. The digit simulation conversion device comprises an iPWM module, a power supply driver and a filter. The iPWM is used for inputting digital audio file streaming to generate differential pulse. The power supply driver is used for providing power to a terminal load. The filter is used for removing unnecessary harmonic wave signals to reconstruct a simulation signal. The iPWM module further comprises a PWM pulse generator, an interpolation resolution unit, a self-correction unit and a differential pulse generator. The PWM pulse generator is used for converting numeric coding which is through digital inputting to the first stage number of the time domain pulse width. The interpolation resolution unit is used for enhancing the time domain resolution of the pulse width. The self-correction unit maintains the precision of the pulse width of the interpolation resolution unit. The differentiate pulse width generator is used for converting the PWM pulse stage numbers to the differentiate types of a voltage domain and the time domain.
Description
technical field [0001] The present invention relates to a device for differential interpolation pulse width modulation (interpolation pulse width modulation, iPWM) digital to analog conversion (digital to analogolog, DAC) and an encoding method for an output signal, in particular to a method for generating high signal-to-noise The iPWM-DAC device of the signal to noise ratio (SNR), and the output coding of the iPWM-DAC form a differential signal defined based on the voltage domain and the time domain. Background technique [0002] Class D (Class-D) audio amplifier is a switching amplifier, or pulse width modulation (pulse widthmodulation, PWM) amplifier. Class D amplifiers typically provide higher than 90% of the output power compared to 50% of the output power provided by conventional linear amplifiers. In order to obtain a class D amplifier with a high signal-to-noise ratio, a feedback loop is usually included. figure 1 A schematic diagram of a conventional class-D ampli...
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IPC IPC(8): H03M1/66
Inventor 曾景宏彭胜铕
Owner TRITAN TECH INC