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Oscillation signal generating circuit and filter circuit

A technology of oscillating signal and filtering circuit, which is applied in the field of oscillating signal generating circuit, can solve the problems of time-consuming and reducing accuracy, and achieve the effect of improving accuracy, reducing time and reducing influence

Pending Publication Date: 2022-05-17
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The implementation of the above-mentioned prior art is quite time-consuming, and the unnecessary harmonics in the mixed frequency signal will affect the detection of the amplitude and reduce the accuracy

Method used

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  • Oscillation signal generating circuit and filter circuit
  • Oscillation signal generating circuit and filter circuit
  • Oscillation signal generating circuit and filter circuit

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Embodiment Construction

[0010] When describing the frequency of a signal in this application, those with general knowledge in the art should understand that the frequency is the maximum frequency in the bandwidth of the signal, for example, the frequency is where the peak of the signal is after Fourier transform , wherein the bandwidth is the full width at half maximum (FWHM) of the frequency distribution of the signal. In some embodiments, the frequency is the center frequency of the signal. Therefore, when the frequency of a signal is described in this application, it does not mean that the signal only has this frequency, and it may include components of other frequencies.

[0011] figure 1 It is a schematic diagram of the oscillation signal generating circuit 10 according to some embodiments of the present invention. The oscillating signal generating circuit 10 is operable in a first mode and a second mode for generating an oscillating signal Sosc, such as a local oscillating signal including an...

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Abstract

A filter circuit includes a filter, a frequency divider and a control circuit. The filter is used for generating a first oscillation signal according to a control signal in a first mode and performing filtering processing according to the control signal in a second mode. The frequency of the first oscillation signal is determined according to the control signal. The frequency divider is coupled to the filter and is used for carrying out frequency division on the first oscillation signal to generate a frequency division signal. The control circuit is coupled to the filter and the frequency divider and is used for comparing the frequency of the frequency division signal with the frequency of the second oscillation signal in the first mode so as to adjust the control signal. The center frequency of the passband of the filter in the second mode is determined according to the adjusted control signal.

Description

technical field [0001] The present invention relates to a signal generating circuit, in particular to an oscillating signal generating circuit including a filter circuit. Background technique [0002] When the direct up-conversion transmitter generates the output signal, it uses a voltage-controlled oscillator to generate the signal to the mixer, and then mixes it with the mixer to generate a mixed frequency signal including the main frequency, and then uses the filter to convert the signal with the main frequency The signal is preserved and unwanted harmonics are removed. However, when the frequency mixing signal has a relatively large bandwidth, the current of the buffer amplifier and the amplitude detection are usually adjusted, and then the center frequency of the filter is selected through an appropriate algorithm. The implementation of the above-mentioned prior art is quite time-consuming, and unnecessary harmonics in the mixed frequency signal will affect the detecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/099H03L7/16
CPCH03L7/099H03L7/16
Inventor 邓平援陈家源
Owner REALTEK SEMICON CORP
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