window function processing module
A processing module and window function technology, applied in the direction of electrical digital data processing, pulse processing, data processing input/output process, etc., can solve the problems of unfavorable front-end analog-to-digital converters, increase circuit power consumption and complexity, etc., to achieve The effect of reducing power consumption and circuit complexity, and reducing the demand for sampling frequency
Active Publication Date: 2020-12-15
SHENZHEN GOODIX TECH CO LTD
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Problems solved by technology
However, the high input frequency of the digital integrator is not conducive to the design of the front-end Analog-to-Digital Converter (ADC). In other words, the front-end ADC needs a higher sampling frequency to be able to Sampling the input high-frequency signal increases the power consumption and complexity of the circuit
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[0027] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.
[0028] This application uses an analog integration circuit to realize the function of the window function, which can adjust the integration gain corresponding to each time period in different time periods, so that the integral output signal of the integration circuit is related to its input signal and the operation result of the window function, so as to Reduce the impact of Sidelobe or Spectrum Leakage on the overall Signal-to-Noise Ratio (SNR) of the system. Please refer to Figure 9 , Figure 9 It is a schematic diagram of a window function processing module 90 in the...
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The present application provides a window function processing module, which includes an integration circuit for receiving an integration input signal, the integration circuit includes an operational amplifier; an integration capacitor, coupled to an output terminal of the operational amplifier and a first input terminal; and an adjustable impedance module, coupled between the first input terminal of the operational amplifier and an integral input terminal of the integrating circuit, the adjustable impedance module is controlled by at least one control signal to adjust the An impedance value of the adjustable impedance module; and a control unit, coupled to the integrating circuit, used to generate the at least one control signal according to a window function to adjust the integral gain of the integrating circuit, so that the integral output signal An operation result related to the integral input signal and the window function.
Description
technical field [0001] The present application relates to an integrating circuit and a window function processing module, especially a window function processing module capable of suppressing sidelobe. Background technique [0002] Match Filter and Mixer have been widely used in communication systems and capacitive touch systems. Generally speaking, a mixer can be realized by a multiplier to generate a received signal and a Multiplication result of local signals. In addition, the mixer can also be implemented by a switching mixer with high linearity and low noise. The switching mixer can be equivalent to multiplying the received signal by a square wave (ie local signal). However, either the square wave or the sine wave has a relatively high sidelobe in the frequency spectrum, which introduces additional noise, thereby reducing the Signal to Noise Ratio (SNR) of the system. In order to solve the problem of noise introduced by the sideband, a window function can be added bef...
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IPC IPC(8): H03M1/52
CPCH03M1/52G06F3/044G06F3/04182H03F3/45475H03F2200/264H03F2203/45526H03F2203/45594H03F2203/45616H03H11/126H03H19/004H03H2210/028H03H2210/036H03K5/02H03K5/1252G06G7/18G06F3/0418G06F17/12H03D7/14H03D2200/0086H03H7/38
Inventor 杨富强文亚南梁颖思
Owner SHENZHEN GOODIX TECH CO LTD