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A Charge Pump Based on Parallel Feedback

A technology of parallel connection and circuit, which is applied in the field of charge pumps, can solve the problems of increased consumption and smaller output voltage range, and achieve the effects of small additional consumption, constant current, and improved matching accuracy

Active Publication Date: 2016-08-17
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Existing methods to improve the current mismatch of the charge pump either increase the complexity of the design, increase additional consumption, or under the condition of ensuring the matching accuracy, the range of the output voltage becomes smaller

Method used

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  • A Charge Pump Based on Parallel Feedback
  • A Charge Pump Based on Parallel Feedback
  • A Charge Pump Based on Parallel Feedback

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Experimental program
Comparison scheme
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Embodiment Construction

[0027] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] Specific implementation 1:

[0029] Figure 5 It is an example of the specific implementation circuit proposed by the present invention. On the basis of the traditional charge pump, add the field effect tube feedback resistor 5 connected in parallel with the field effect tube switch of the output stage reference current source circuit and the field effect tube with the injection current source circuit The effect transistor switch is connected in parallel with the field effect transistor feedback resistor 6 to improve the performance of the charge pump. The simulation of this circuit is based on 40nm CMOS process and powered by 1V voltage.

[0030] The n-type feedback resistor in 5 is implemented by an n-type field effect transistor M5n, which is connected in parallel with the n-type field effect transistor switch M3n in 3, and the gate ...

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Abstract

The invention provides a charge pump based on parallel feedback, which includes an injection level reference current source circuit (1), an injection current source circuit (2), an output level reference current source circuit (3), an output current source circuit (4), and The output stage reference current source circuit (3) FET feedback resistor (5) connected in parallel with the FET switch and the FET feedback resistor (6) connected in parallel with the FET switch of the injection current source circuit (2). The output current-voltage curve is changed by the MOSFET feedback resistor (5) connected in parallel with the reference current source switch of the output stage and the MOSFET feedback resistor (6) connected in parallel with the injection current source switch, so that it can operate at a larger output voltage Maintain a certain current matching accuracy within the range. On the basis of the prior art, the present invention introduces a field effect transistor feedback resistor connected in parallel with the field effect transistor switch of the injection current source circuit, and realizes a larger voltage output range under the condition of better current matching at a very small cost.

Description

technical field [0001] The invention relates to the technical field of charge pumps, in particular to a charge pump based on parallel feedback. Background technique [0002] In a communication system, the clock signal is one of the most critical signals, which is often provided by a frequency synthesizer, and its performance directly determines the quality of signal transmission. For example, if the output spectrum of the frequency synthesizer has a large spur, this spur can convert the noise of the non-signal frequency band into the channel, overlap with the signal to be transmitted, and deteriorate the signal-to-noise ratio (SNR), while This noise is difficult to filter out. Therefore, it is very important to suppress the output spur of the frequency synthesizer. [0003] The output spectrum spur of the frequency synthesizer is due to the periodic fluctuation in the control signal of the voltage-controlled oscillator (VCO). Through the integration effect of the voltage-c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/07
Inventor 朱光朱瑾刁盛锡林福江
Owner UNIV OF SCI & TECH OF CHINA