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Single-ended output low-noise fully-differential switched capacitor filter

A switched capacitor, single-ended output technology, applied in multi-terminal to network, frequency selective two-terminal to network, etc., can solve the problems of aggravating signal nonlinearity, aggravating the nonlinearity of the final single-ended signal, and having a great influence on the signal by glitch. The effect of eliminating the fault and keeping the DC gain constant

Pending Publication Date: 2020-07-24
苏州真感微电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] 3), the impact of the slew rate of the switched capacitor filter will aggravate the signal nonlinearity of the final single-ended output
The reason is that if Figure 5 As shown, the slew rate will cause the output of the switched capacitor filter to have a glitch related to the signal. The size of the glitch varies with the signal amplitude. The larger the signal amplitude, the greater the impact of the glitch on the signal, which will make the signal nonlinear. exacerbated

Method used

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  • Single-ended output low-noise fully-differential switched capacitor filter
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  • Single-ended output low-noise fully-differential switched capacitor filter

Examples

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Embodiment 1

[0053] A low-noise fully differential switched capacitor filter with single-ended output, comprising: a signal source, a square wave generator, a fully differential amplifier 128, a differential amplifier 124, 1 pair of sampling capacitors, 1 pair of feedback capacitors, 1 pair of integrating capacitors, 6 The pair of switch tubes, 4 resistors and 2 capacitors, and 6 pairs of switch tubes are all connected to the square wave generator. Wherein, the signal source includes an input signal source 119 and a DC bias voltage source 120 , the input signal source 119 and the DC bias voltage source 120 are connected in sequence, and the other end of the DC bias voltage source 120 is grounded.

[0054] One end of the ninth switching tube 101 is connected to the input signal source 119 to obtain the input signal, the other end of the ninth switching tube 101 is connected to one end of the third switching tube 107 and one end of the first sampling capacitor 103, and the other end of the th...

Embodiment 2

[0060] A low noise fully differential switched capacitor filter with single-ended output, such as figure 2 As shown, it includes: signal source, square wave generator, fully differential amplifier 128, differential amplifier 124, 1 pair of sampling capacitors, 1 pair of feedback capacitors, 1 pair of integrating capacitors, 6 pairs of switch tubes, 5 resistors and 3 capacitors, 6 pairs of switching tubes are connected with the square wave generator. Wherein, the signal source includes an input signal source 119 and a DC bias voltage source 120 , the input signal source 119 and the DC bias voltage source 120 are connected in sequence, and the other end of the DC bias voltage source 120 is grounded.

[0061]One end of the ninth switching tube 101 is connected to the input signal source 119 to obtain the input signal, the other end of the ninth switching tube 101 is connected to one end of the third switching tube 107 and one end of the first sampling capacitor 103, and the othe...

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PUM

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Abstract

The invention provides a single-ended output low-noise fully-differential switched capacitor filter, which is characterized in that a double-ended to single-ended circuit is arranged in a loop of thefully-differential switched capacitor filter, and the output end of the double-ended to single-ended circuit is connected with a feedback capacitor pair of the fully-differential switched capacitor filter through a switching tube. The structure of the invention not only can realize the traditional function of converting double-end output into single-end output, but also can inhibit noise and mismatch influence of a double-end-to-single-end circuit, and signal nonlinearity caused by small rate.

Description

technical field [0001] The invention relates to the acquisition, amplification and analog-to-digital conversion (ADC) of sensors and other physical signals, and is suitable for high-sensitivity signal link systems, especially the signal acquisition and conditioning of weak signal sensors, and is used in automobiles, home appliances, industrial automation, robots, The Internet of Things and military fields have wide applicability. Background technique [0002] In order to obtain a single-ended signal from the double-ended output signal of a switched capacitor filter, the traditional way is as figure 1 shown. The double-ended output of the fully differential switched capacitor filter (the SCF shown in the figure is a first-order low-pass filter, but this article is not limited to it) is directly connected to a double-ended to single-ended circuit to achieve the required requirements. [0003] Wherein, 119 is an input signal, and 120 is an input DC bias voltage; [0004] 128...

Claims

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Application Information

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IPC IPC(8): H03H11/12
CPCH03H11/12
Inventor 李恒王磊
Owner 苏州真感微电子科技有限公司