Frequency-hopping carrier generator
A generator and carrier technology, applied in the direction of amplifiers, amplifiers with semiconductor devices/discharge tubes, electrical components, etc., can solve the problems of audio signal interference and the inability to reduce the degree of interference, and achieve the effect of avoiding difference frequency interference
Inactive Publication Date: 2008-12-17
戴枝德
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Problems solved by technology
However, since the garbled code generator is not synchronized with the PWM carrier, the difference frequency of the two signals will cause interference to the audio signal
Since the signal of the garbled code generator is regarded as a random signal, the difference frequency interference signal is also regarded as a random interference signal, and the degree of interference cannot be reduced by a specific line
Method used
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[0021] For being able to describe the present invention in detail, please refer to figure 2 and image 3 . The frequency hopping carrier generator of the embodiment of the present invention includes a ramp voltage generator 12 for generating different varying frequencies.
[0022] The frequency-hopping carrier generator includes a current source 14 that generates a first current. After the current source 14 generates the first current, it outputs the first current to the receiving end of a ramp voltage generator 12, and the ramp voltage generator 12 receives the first current. After a current, cooperate with the capacitor 16 to output a ramp voltage. Such as figure 1 As shown, the output terminal of the ramp voltage generator 12 is respectively connected to a capacitor 16 (fixed value), a voltage detection and direction controller 18 , and a pulse width modulation (PWM) module 24 . When the voltage detection and direction controller 18 sends a control signal to change the...
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The invention discloses a frequency hopping carrier generator, comprising a current source for generating a first current, output to a ramp voltage generator, which outputs the ramp voltage. The output ends of the ramp voltage generator are respectively connected with a capacitance, a voltage sense and direction controller, and a pulse width modulating module, which receives the audio input signal, after the voltage sense and direction controller receives the ramp voltage, synchronously output the control signal to the ramp voltage generate and a counter connected with a digital control current source. According to the value of the counter, the digital control current source outputs a second current to the ramp voltage generator. The input end of the switch power amplifier receives the signal from the pulse width modulating module and modulates the audio input signal to output D-kind signal.
Description
technical field [0001] The invention relates to a frequency-hopping carrier generator, in particular to a frequency-hopping carrier generator without a low-pass filter and generating variable frequency according to a first current and a second current to reduce EMI peak value. Background technique [0002] Class D (digital audio power) amplifier is a kind of input analog audio signal or PCM digital information is converted into PWM (pulse width modulation) or PDM (pulse density modulation) and other pulse signals, and then use PWM or PDM pulse signal to Audio power amplifiers that control the on / off of high-power switching devices, also known as switching power amplifiers, have the outstanding advantage of high efficiency. Class D amplification or digital amplifier consists of four parts: input signal processing circuit, switching signal forming circuit, switching power circuit (half-bridge and full-bridge) and low-pass filter (LC). Class D amplifiers use extremely high fre...
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IPC IPC(8): H03F3/217H03F1/00
Inventor 戴枝德
Owner 戴枝德