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High-Speed ​​Comparators for Passive Sampling Networks

A high-speed comparator and network technology, applied in the field of comparators, can solve the problems of narrow comparator bandwidth and high cost of offset voltage, and achieve the effect of wide bandwidth and easy matching

Active Publication Date: 2021-04-09
SHANGHAI BEILING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a high-speed comparator for passive sampling network in order to overcome the defects of narrow bandwidth and high cost of eliminating offset voltage in the prior art

Method used

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  • High-Speed ​​Comparators for Passive Sampling Networks
  • High-Speed ​​Comparators for Passive Sampling Networks
  • High-Speed ​​Comparators for Passive Sampling Networks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The high-speed comparator of the passive sampling network of this embodiment is used for receiving single-ended signals, such as image 3 As shown, it includes: the first switch sw1, the second switch sw2, the third switch sw3, the fourth switch sw4, the fifth switch sw5, the sixth switch sw6, the seventh switch sw7, the first capacitor C s1 , the second capacitance C s2 , pre-amplifier 103, latch 104;

[0061] One end of the first switch sw1 is used as the first input end 101 of the high-speed comparator of the passive sampling network, the other end of the first switch sw1, the second capacitor C s2 , the fourth switch sw4, the first capacitor C s1 connected in series in sequence to the positive input terminal of the preamplifier 103, the negative input terminal of the preamplifier 103 is connected to the ground terminal GND, and the output terminal of the preamplifier 103 is connected to the ground terminal GND through the seventh switch sw7;

[0062] One end of t...

Embodiment 2

[0078] The high-speed comparator of the passive sampling network of the present embodiment, as Figure 5 As shown, the difference from the high-speed comparator of the passive sampling network in Embodiment 1 is that the input voltage vin is input from the second input terminal 102 , and the threshold voltage vth is input from the first input terminal 101 . In the ck1 / ck1p phase, the input voltage vin and the threshold voltage vth are respectively sampled to C s1 and C s2 On, compare the ck2 / ck2p phase and output the result. The input positions of the input signal vin and the threshold voltage signal vth can be interchanged, which is where the flexibility of the high-speed comparator of the passive sampling network of the present invention lies.

[0079] In order to facilitate the calculation of the difference vin-vth between the input voltage vin and the threshold voltage vth, the first capacitor C s1 with the second capacitor C s2 The capacitor values ​​are preferably eq...

Embodiment 3

[0082] This embodiment provides a high-speed comparator of a passive sampling network for receiving differential signals, such as Figure 6 As shown, it includes: the first switch sw1, the second switch sw2, the third switch sw3, the fourth switch sw4, the fifth switch sw5, the sixth switch sw6, the seventh switch sw7, the first capacitor C s1 , the second capacitance C s2 , preamplifier 203, latch 204, eighth switch sw8, ninth switch sw9, tenth switch sw10, eleventh switch sw11, twelfth switch sw12, thirteenth switch sw13, third capacitor C s3 , the fourth capacitor C s4 ;

[0083] One end of the first switch sw1 is used as the first positive input end of the high-speed comparator of the passive sampling network, the other end of the first switch sw1, the second capacitor C s2 , the fourth switch w4, the first capacitor C s1 connected in series successively, and connected to the positive input end of the pre-amplifier 203;

[0084] One end of the second switch sw2 is con...

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Abstract

The invention discloses a high-speed comparator of a passive sampling network, wherein a high-speed comparator of a passive sampling network is used for receiving single-ended signals, comprising: a first switch, a second capacitor, a fourth switch, and a first capacitor in sequence In series, one end of the first switch is used as the first input end of the high-speed comparator of the passive sampling network; the positive input end of the pre-amplifier is connected to one end of the first capacitor, the negative input end is connected to the ground end, and the output end passes through the seventh switch Connected to the ground terminal; one end of the second switch is connected to the ground terminal, and the other end is connected between the first switch and the second capacitor; one end of the third switch is connected to the ground terminal, and the other end is connected to the second capacitor and the fourth switch Between; the input terminal of the latch is connected with the output terminal of the pre-amplifier, and the output terminal of the latch is used as the output terminal of the high-speed comparator of the passive sampling network. The invention adopts a passive sampling network, which can realize wider bandwidth.

Description

technical field [0001] The invention belongs to the technical field of comparators, in particular to a high-speed comparator for a passive sampling network. Background technique [0002] The switched capacitor high-speed comparator usually has a low-gain pre-amplifier (pre-amplifier) ​​cascaded with a positive feedback latch (latch), plus some switches and capacitors, used to compare the analog signal with a threshold voltage, Based on the comparison result, a digital signal is output. Traditional switched-capacitor high-speed comparator structures, such as figure 1 As shown (the fully differential structure is given here as a schematic diagram), consisting of pre-amplifier (pre-amplifier), latch (latch), switch, capacitor C s Composition, C p is the equivalent input parasitic capacitance of the pre-amplifier. Among them, vbias is the DC bias voltage; vthp-vthn is the threshold voltage of a pair of differential; vin_p-vin_n is a pair of differential input signals; voutp-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K5/22H03M1/38
CPCH03K5/22H03M1/38
Inventor 李丹张辉王海军富浩宇陈正李琪林高远魏亮孙毅
Owner SHANGHAI BEILING