Switched capacitor all-digital frequency mixer and anti-aliasing filter

An anti-aliasing filter and anti-aliasing filtering technology, which is applied to the modulation transformation, impedance network, and electrical components of semiconductor devices with at least two electrodes, can solve the problem that the range of ratio changes is limited, not fine enough, and it is not conducive to improving Frequency response characteristics and other issues to achieve the effect of optimization of phase-frequency characteristics, improvement of linearity, and improvement of implementation methods

Active Publication Date: 2012-08-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limitation of process factors, the range of variation of the ratio is very limited and not fine enough, which is not conducive to improving the frequency response characteristics

Method used

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  • Switched capacitor all-digital frequency mixer and anti-aliasing filter
  • Switched capacitor all-digital frequency mixer and anti-aliasing filter
  • Switched capacitor all-digital frequency mixer and anti-aliasing filter

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Embodiment Construction

[0013] The principle of the present invention is: connect several capacitors that can be realized on the integrated circuit under certain process conditions in series to obtain capacitors with smaller capacitances, and connect each capacitor in parallel with a switch MOS tube, and control the on-off through digital bit control The capacitor is connected to the circuit or is shorted. In this way, a larger range of variation and more precise control of the capacitance value of the capacitor and the ratio between the capacitors can be realized.

[0014] The method of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0015] figure 1 The circuit of the switched capacitor all-digital mixer and anti-aliasing filter is shown. In the figure, m is the number of historical capacitors, n is the number of rotating capacitor groups, and k is the number of capacitors connected in series for each group of rotating capacitor...

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Abstract

The invention discloses a switched capacitor all-digital frequency mixer and an anti-aliasing filter circuit. Current / voltage is sampled by use of a switched capacitor, the function of a digital filter is realized by virtue of charge sharing, filter parameters are dynamically regulated by multiple-digit high and low electrical levels, the phase-frequency characteristic of the digital filter based on the principle is optimized, voltage loss caused by using the switched capacitor filter can be lowered, and the gain of the whole circuit is improved.

Description

technical field [0001] The invention relates to an improved switched capacitor all-digital mixer and an anti-aliasing filter, in particular to a method for dynamically adjusting the capacitor value of an access circuit and a method for improving the phase-frequency characteristic of the filter. Background technique [0002] Some communication systems have certain requirements for the phase characteristics of the signal, and optimizing the phase characteristics is also of great significance for signal transmission without distortion. However, the existing digital filters do not pay much attention to the phase-frequency characteristics. The invention improves the realization mode of the digital filter, makes it easier to optimize the phase-frequency characteristics, and proposes a method for optimizing the phase-frequency characteristics. [0003] In order to improve the linearity of the phase-frequency response of the switched capacitor digital filter and optimize the amplitu...

Claims

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Application Information

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IPC IPC(8): H03D7/12H03H9/46
Inventor 多尔泰虞小鹏潘赟
Owner ZHEJIANG UNIV
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