CN110098810A - A kind of switched-capacitor integrator - Google Patents

A kind of switched-capacitor integrator Download PDF

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Publication number
CN110098810A
CN110098810A CN201910421151.7A CN201910421151A CN110098810A CN 110098810 A CN110098810 A CN 110098810A CN 201910421151 A CN201910421151 A CN 201910421151A CN 110098810 A CN110098810 A CN 110098810A
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China
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mos switch
capacitor
module
switched
operational amplifying
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CN201910421151.7A
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CN110098810B (en
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马松
刘力源
窦润江
刘剑
吴南健
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Institute of Semiconductors of CAS
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/08—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
    • H03F1/083—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements in transistor amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3205—Modifications of amplifiers to reduce non-linear distortion in field-effect transistor amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3211—Modifications of amplifiers to reduce non-linear distortion in differential amplifiers

Abstract

A kind of switched-capacitor integrator, comprising: dynamic amplifier, for amplifying input signal, including operational amplifying module, two accelerating modules and tail current biasing module, wherein and operational amplifying module, for providing scheduled gain amplifier；Two accelerating modules increase the amplification speed of operational amplifying module for increasing the operating current of the amplification module；Tail current biasing module, for providing bias current for operational amplifying module, to determine the dc point of amplification module；Two switching capacities are respectively arranged on the positive input and reverse input end of operational amplifying module, for inputting input signal to operational amplifying module；Two integrating capacitors are connected across the positive input and inverse output terminal and reverse input end and positive output end of operational amplifying module, respectively for realizing the integral of input signal.Switched-capacitor integrator provided by the invention can accelerate the foundation of integrator under the premise of not damaging Amplifier linearity, improve it and establish precision.

Description

A kind of switched-capacitor integrator
Technical field
The present invention relates to technical field of integrated circuits more particularly to a kind of switched-capacitor integrators.
Background technique
Switched-capacitor integrator extensive application in analog filter, analog-digital converter is traditional based on fortune The characteristics of switched-capacitor integrator power consumption for calculating amplifier is high, and dynamic amplifier does not have quiescent dissipation, switchs work keeps it suitable Combination switch capacitance integrator.But common dynamic amplifier may require that amplifier consumption is more in the capacitive load of amplification transfer phase Electric current, could have enough mutual conductances, establish required precision to reach, but the common mode characteristic of dynamic amplifier, shadow can be damaged The linearity is rung, it can be seen that switched-capacitor integrator establishes between precision and Amplifier linearity that there are contradictions.
Summary of the invention
(1) technical problems to be solved
Based on the above issues, the present invention provides a kind of switched-capacitor integrators, can not damage Amplifier linearity Under the premise of, accelerate the foundation of integrator, improves it and establish precision.
(2) technical solution
A kind of switched-capacitor integrator, comprising: dynamic amplifier, for amplifying input signal, including operational amplifying module, Two accelerating modules and tail current biasing module, wherein operational amplifying module, for providing scheduled gain amplifier；Two accelerate Module increases the amplification speed of operational amplifying module for increasing the operating current of the amplification module；Tail current biasing Module, for providing bias current for operational amplifying module, to determine the dc point of operational amplifying module；Two switch electricity Hold, be respectively arranged on the positive input and reverse input end of operational amplifying module, for inputting input letter to operational amplifying module Number；Two integrating capacitors, be connected across respectively operational amplifying module positive input and inverse output terminal and reverse input end and Positive output end, for realizing the integral of input signal.
Optionally, operational amplifying module includes four metal-oxide-semiconductor field effect transistors, respectively M1、M2、MC1And MC2And two MOS Switch Φrst, wherein M1With M2It is adjacent, M1With M2Grid be respectively reverse input end and positive input, the M1With M2's Drain electrode is connected, M1With M2Source electrode respectively with MC1With MC2Drain electrode connection, MC1With MC2Source electrode be respectively positive output end and anti- To output end, and pass through a MOS switch Φ respectivelyrstWith reference voltage VDDConnection, MC1With MC2Grid be connected.
Optionally, operational amplifying module further includes two partially installing capacitors, respectively capacitor Cb1With capacitor Cb2, capacitor Cb1With electricity Hold Cb2Series connection, and capacitor Cb1One end connect with positive output end, capacitor Cb1The other end and MC1Or MC2Grid connection；Electricity Hold Cb2One end connect with inverse output terminal, capacitor Cb2The other end and MC1Or MC2Grid connection.
Optionally, each accelerating module includes the first metal-oxide-semiconductor field effect transistor, the second metal-oxide-semiconductor field effect transistor in two accelerating modules An and MOS switch Φen, the grid of the first metal-oxide-semiconductor field effect transistor and the second metal-oxide-semiconductor field effect transistor is connected to ground after being connected, the first MOS The source electrode of field-effect tube and the second metal-oxide-semiconductor field effect transistor and reference voltage VDDConnection, the drain electrode of the first metal-oxide-semiconductor field effect transistor and ground are even It connects, the drain electrode of the second metal-oxide-semiconductor field effect transistor passes through MOS switch ΦenWith MC1Or MC2Drain electrode connection.
Optionally, tail current biasing module includes a MOS switch Φen, metal-oxide-semiconductor field effect transistor MT1And MT2An and resistance RB1, MT1And MT2Grid connection after with resistance RB1One end connection, MT1And MT2Drain electrode be connected to ground, MT1Source electrode and the electricity Hinder RB1One end connection, resistance RB1The other end connect with a predeterminated voltage, MT2Source electrode pass through MOS switch ΦenWith M1With M2 Drain electrode connection.
Optionally, each switching capacity includes a capacitor C, MOS switch Φ1, MOS switch Φ1e, MOS switch Φ2And MOS switch Φ2e, the one end capacitor C and MOS switch Φ1Connection, the other end pass through MOS switch Φ2eWith the forward direction of operational amplifying module Input terminal or reverse input end connection, one end of capacitor C also passes through MOS switch Φ2It is connect with the first input common mode voltage, capacitor The other end of C also passes through MOS switch Φ1eIt is connect with the second input common mode voltage.
It optionally, further include external clock, for generating MOS switch Φ1, MOS switch Φ1e, MOS switch Φ2, MOS opens Close Φ2e, MOS switch ΦrstAnd MOS switch ΦenClock signal.
Optionally, the working frequency of external clock is 6.144MHz.
Optionally, MOS switch Φ1eIt is ahead of MOS switch Φ1Work, working frequency is 3.072MHz；MOS switch Φ2eIt is ahead of MOS switch Φ2Work, working frequency is 3.072MHz.
Optionally, MOS switch ΦenOperate continually at MOS switch ΦrstLater, and MOS switch ΦenWith MOS switch Φrst Total working section and MOS switch Φ2Or Φ2eOperation interval it is consistent.
(3) beneficial effect
The present invention provides a kind of switched-capacitor integrators, at least have the following beneficial effects:
(1) dynamic amplifier used in the present invention, there is no big load capacitances, save area, the complexity of circuit It spends and saves useless power consumption；
(2) dynamic amplifier in the present invention, has been changed to MOS switch for wherein traditional PMOS load, can will amplify Device gain improves 2 times or so, improves the precision of integrator；
(3) dynamic amplifier in the present invention, including accelerating module, can be in the premise for guaranteeing the dynamic amplifier linearity Under, that improves integrator establishes precision.
Detailed description of the invention
Fig. 1 diagrammatically illustrates the structural schematic diagram of the switched-capacitor integrator of the embodiment of the present disclosure；
Fig. 2 diagrammatically illustrates the detailed construction signal of the dynamic amplifier of the switched-capacitor integrator of the embodiment of the present disclosure Figure；
When Fig. 3 diagrammatically illustrates the dynamic amplifier external clock work of the switched-capacitor integrator of the embodiment of the present disclosure Sequence schematic diagram.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference Attached drawing, the present invention is described in more detail.
Switched-capacitor integrator is a kind of common analog module, in analog integrated filters and Analog-digital Converter It being widely used in device, traditional switch capacitance integrator circuit generallys use normal operation amplifier as active amplifier element, Its power overhead is often very big, the power consumption of integrator can be reduced using dynamic amplifier, but face the foundation of integrator Contradiction between precision and Amplifier linearity in exemplary embodiment of the present invention, provides a kind of switched-capacitor integrator, It is specific as follows to solve the contradiction that integrator is established between precision and Amplifier linearity.
A kind of switched-capacitor integrator, referring to Fig. 1, comprising: dynamic amplifier, including operational amplifying module, accelerating module And tail current biasing module, wherein operational amplifying module, for providing scheduled gain to amplify input signal；Two accelerate Module increases the amplification speed of operational amplifying module for increasing the operating current of amplification module；Tail current biasing module, For providing bias current for operational amplifying module, to determine the dc point of operational amplifying module；Two switching capacities, respectively Set on the positive input and reverse input end of operational amplifying module, for inputting input signal to operational amplifying module；Two products Point capacitor is connected across positive input and inverse output terminal and reverse input end and the positive output of operational amplifying module respectively End, for realizing the integral of input signal.It will describe in detail below to it.
Dynamic amplifier, including operational amplifying module, accelerating module and tail current biasing module, wherein operation amplifier Module, for providing scheduled gain to amplify input signal；Two accelerating modules, for increase the operating current of amplification module with Increase the amplification speed of operational amplifying module；Tail current biasing module, for providing bias current for operational amplifying module, with Determine the dc point of operational amplifying module；
Specifically, referring to fig. 2, operational amplifying module, including four metal-oxide-semiconductor field effect transistors, respectively M1、M2、MC1And MC2, And two MOS switch Φrst, wherein four metal-oxide-semiconductor field effect transistors constitute cascode structure, can not introduce additional pole Under the premise of, larger gain is provided.Compared with conventional operational amplifiers, the dynamic amplifier in the embodiment of the present invention does not include PMOS current source load, and by two reset MOS switch ΦrstInstead of, for output voltage to be reset to supply voltage, if Set the primary condition of dynamic amplifier work.M1With M2It is disposed adjacent, M1With M2Grid be respectively the anti-of the operational amplifying module To input terminal and positive input, M1With M2Drain electrode be connected with each other, M1With M2Source electrode respectively with MC1With MC2Drain electrode connection, MC1With MC2Source electrode be respectively positive output end and inverse output terminal, and pass through a MOS switch Φ respectivelyrstWith reference voltage VDD Connection, as MOS switch ΦrstWhen connection, the inverse output terminal of operational amplifying module and positive output end are reset to reference to electricity Pressure, MC1With MC2Grid be connected with each other.
The operational amplifying module further includes two partially installing capacitors, respectively capacitor Cb1With capacitor Cb2, two partially installing capacitors Capacitor is smaller, capacitor Cb1With capacitor Cb2Series connection, and capacitor Cb1One end connect with forward direction output end vo n, capacitor Cb1The other end With MC1Or MC2Grid connection；Capacitor Cb2One end connect with inverse output terminal Vop, capacitor Cb2The other end and MC1Or MC2's Grid connection.For for MC1Or MC2Dynamic bias voltage is provided, because its capacitance is smaller, will not deteriorate integrator establishes characteristic.
Two accelerating modules increase the amplification speed of operational amplifying module for increasing the operating current of amplification module；
Specifically, two accelerating modules are respectively arranged on MC1Drain electrode and reference voltage VDDAnd and MC2Drain electrode and with reference to electricity Press VDDBetween.Each accelerating module includes the first metal-oxide-semiconductor field effect transistor, the second metal-oxide-semiconductor field effect transistor and an enabled MOS switch Φen, the first metal-oxide-semiconductor field effect transistor, the second metal-oxide-semiconductor field effect transistor constitute current mirror, design with M times of gain, can save power consumption.The The grid of one metal-oxide-semiconductor field effect transistor and the second metal-oxide-semiconductor field effect transistor is connected to ground after being connected, the first metal-oxide-semiconductor field effect transistor and the 2nd MOS The source electrode and reference voltage V of effect pipeDDConnection, the drain electrode of the first metal-oxide-semiconductor field effect transistor are connected to ground, wherein one the 2nd MOS effects Should pipe drain electrode pass through MOS switch ΦenWith MC1Drain electrode connection, the drain electrode of another second metal-oxide-semiconductor field effect transistor passes through MOS switch ΦenWith MC2Drain electrode connection.The accelerating module can to input metal-oxide-semiconductor field effect transistor M by providing an additional branches1With M2Operating current increase IA, but this electric current will not influence the foundation of output common mode voltage, thus guaranteeing that dynamic amplifier is linear Under the premise of degree, increase the mutual conductance of input pipe in metal-oxide-semiconductor field effect transistor, improve integrator establishes characteristic.
Tail current biasing module, for providing bias current for operational amplifying module, to determine the direct current of amplification module Operating point；
Specifically, tail current biasing module includes a MOS switch Φen, metal-oxide-semiconductor field effect transistor MT1And MT2An and biased electrical Hinder RB1, metal-oxide-semiconductor field effect transistor MT1And MT2Constitute current mirror, MT1And MT2Grid connection after with resistance RB1One end connection, MT1With MT2Drain electrode be connected to ground, MT1Source electrode and resistance RB1One end connection, resistance RB1The other end connect with a predeterminated voltage, MT2Source electrode pass through a MOS switch ΦenWith M1With M2Drain electrode connection.In MOS switch ΦrstWhen closure, switch exports forward direction End Von and inverse output terminal Vop is reset to reference voltage VDD, then work as MOS switch ΦenWhen closure, tail current biasing module quilt Circuit is accessed, sink current is provided, so that the dynamic amplifier is started to work.
The work of dynamic amplifier disclosed by the embodiments of the present invention is mutually divided into common mode and differential mode two parts, for common mode under Heavy electric current can be by the voltage pull-down of Von and inverse output terminal Vop, until on a suitable output common mode voltage, the present invention is real Applying is preferably V in exampleDD/ 2, at the same time, difference mode signal is inputted, integrating capacitor C can be passed throughInpAnd CInnOn establish differential mode output Voltage completes integrating function.
Two switching capacities are respectively arranged on the positive input and reverse input end of operational amplifying module, for putting to operation Big module inputs input signal；
Specifically, two switching capacities are respectively positive input switching capacity and reverse input end switching capacity, forward direction is defeated Entering end switch capacitor includes a capacitor C, MOS switch Φ1, MOS switch Φ1e, MOS switch Φ2And MOS switch Φ2e, capacitor C One end and MOS switch Φ1Connection, the other end pass through MOS switch Φ2ePositive input or reversed input with operational amplifying module End connection, one end of capacitor C also passes through MOS switch Φ2It is connect with the first input common mode voltage, the other end of capacitor C also passes through MOS switch Φ1eIt is connect with the second input common mode voltage；Reverse input end switching capacity includes a capacitor C, MOS switch Φ1, MOS Switch Φ1e, MOS switch Φ2And MOS switch Φ2e, the one end capacitor C and MOS switch Φ1Connection, the other end pass through MOS switch Φ2It is connect with the positive input of operational amplifying module or reverse input end, one end of capacitor C also passes through MOS switch Φ2With The connection of one input common mode voltage, the other end of capacitor C also pass through MOS switch Φ1eIt is connect with the second input common mode voltage.
Two integrating capacitors are connected across positive input and inverse output terminal and the reversed input of operational amplifying module respectively End and positive output end, for realizing the integral of input signal.
Specifically, two integrating capacitors in the embodiment of the present invention are respectively CInpAnd CInn, wherein CInpIt is connected across reversed defeated Enter between end and positive output end, CInnIt is connected across between positive input and inverse output terminal.
The switched-capacitor integrator further includes an external clock FCLK, referring to Fig. 3, for generating MOS switch Φ1, MOS opens Close Φ1e, MOS switch Φ2, MOS switch Φ2e, MOS switch ΦrstAnd MOS switch ΦenClock signal.The embodiment of the present invention In external clock FCLKFrequency be 6.144MHz, MOS switch Φ1eIt is ahead of MOS switch Φ1Work, working frequency are 3.072MHz；MOS switch Φ2eIt is ahead of MOS switch Φ2Work, working frequency is 3.072MHz, be can satisfy pair 64 times of over-sampling rates of the audio signal of 24KHz bandwidth, MOS switch Φ1With MOS switch Φ2It does not overlap.MOS switch ΦenContinuously Work in MOS switch ΦrstLater, and MOS switch ΦenWith MOS switch ΦrstTotal working section and MOS switch Φ2Or Φ2e Operation interval it is consistent, it is ensured that sampling capacitance and integrating capacitor will not be shared in output node due to charge connecting moment Falling for big transient voltage occurs.
Switched-capacitor integrator provided in an embodiment of the present invention is fully differential structure, the work of entire switched-capacitor integrator It is divided into sampling mutually and phase is amplified in transfer, wherein sampling is mutually by MOS switch Φ1Control, transfer amplification is mutually by MOS switch Φ2Control, Capacitor C1And C2For sampling capacitance, Φ1eAnd Φ1It compares, edge more early arrives, it is possible to reduce Charge injection effect is to the linearity It influences, this is a kind of bottom plate sampling technique.Sampling capacitance C1、C2With integrating capacitor CInp、CInnCapacitive feedback network is constituted, by The higher small signal gain of dynamic amplifier can form " empty short " effect, so that sampling capacitance is being sampled in its input terminal Mutually collected signal charge can be forced to be transferred in integrating capacitor, so as to complete integrating function.
So far, attached drawing is had been combined the present embodiment is described in detail.According to above description, those skilled in the art There should be clear understanding to switched-capacitor integrator of the present invention.The embodiment of the present invention provides a kind of using dynamic amplifier The use that switched-capacitor integrator compares dynamic amplifier with Conventional amplifiers can reduce the power consumption of integrator.Meanwhile The present invention can remove the heavy load capacitor of dynamic amplifier, further reduce power consumption by suitable scheduling.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in guarantor of the invention Within the scope of shield.

Claims (10)

1. a kind of switched-capacitor integrator, comprising:
Dynamic amplifier, for amplifying input signal, including operational amplifying module, two accelerating modules and tail current bias mould Block, wherein operational amplifying module, for providing scheduled gain amplifier；Two accelerating modules, for increasing the amplification module Operating current is to increase the amplification speed of the operational amplifying module；Tail current biasing module, for being the operation amplifier Module provides bias current, with the dc point of the determination operational amplifying module；
Two switching capacities are respectively arranged on the positive input and reverse input end of the operational amplifying module, are used for the fortune It calculates amplification module and inputs the input signal；
Two integrating capacitors are connected across positive input and inverse output terminal and the reversed input of the operational amplifying module respectively End and positive output end, for realizing the integral of the input signal.
2. switched-capacitor integrator according to claim 1, the operational amplifying module includes four metal-oxide-semiconductor field effect transistors, Respectively M1、M2、MC1And MC2And two MOS switch Φrst, wherein M1With M2It is adjacent, M1With M2Grid be respectively described Reverse input end and positive input, the M1With M2Drain electrode be connected, the M1With M2Source electrode respectively with the MC1With MC2's Drain electrode connection, the MC1With MC2Source electrode be respectively the positive output end and inverse output terminal, and opened respectively by a MOS Close ΦrstWith reference voltage VDDConnection, the MC1With MC2Grid be connected.
3. switched-capacitor integrator according to claim 2, the operational amplifying module further includes two partially installing capacitors, respectively For capacitor Cb1With capacitor Cb2, the capacitor Cb1With capacitor Cb2Series connection, and the capacitor Cb1One end and the positive output end Connection, the capacitor Cb1The other end and the MC1Or MC2Grid connection；The capacitor Cb2One end and the reversed output End connection, the capacitor Cb2The other end and the MC1Or MC2Grid connection.
4. switched-capacitor integrator according to claim 2, each accelerating module includes in two accelerating module One metal-oxide-semiconductor field effect transistor, the second metal-oxide-semiconductor field effect transistor and a MOS switch Φen, first metal-oxide-semiconductor field effect transistor and the 2nd MOS The grid of effect pipe is connected to ground after being connected, the source electrode of first metal-oxide-semiconductor field effect transistor and the second metal-oxide-semiconductor field effect transistor and the ginseng Examine voltage VDDConnection, the drain electrode of first metal-oxide-semiconductor field effect transistor are connected to ground, and the drain electrode of second metal-oxide-semiconductor field effect transistor passes through The MOS switch ΦenWith the MC1Or MC2Drain electrode connection.
5. switched-capacitor integrator according to claim 2, the tail current biasing module includes a MOS switch Φen, Metal-oxide-semiconductor field effect transistor MT1And MT2An and resistance RB1, the MT1And MT2Grid connection after with the resistance RB1One end connection, The MT1And MT2Drain electrode be connected to ground, the MT1Source electrode and the resistance RB1One end connection, the resistance RB1It is another One end is connect with a predeterminated voltage, the MT2Source electrode pass through the MOS switch ΦenWith the M1With M2Drain electrode connection.
6. switched-capacitor integrator according to claim 1, each switching capacity includes a capacitor C, MOS switch Φ1, MOS switch Φ1e, MOS switch Φ2And MOS switch Φ2e, the one end the capacitor C and the MOS switch Φ1Connection, separately One end passes through the MOS switch Φ2eIt is connect with the positive input of the operational amplifying module or reverse input end, the capacitor One end of C also passes through MOS switch Φ2It is connect with the first input common mode voltage, the other end of the capacitor C also passes through MOS switch Φ1eIt is connect with the second input common mode voltage.
7. switched-capacitor integrator according to claim 6 further includes external clock, for generating the MOS switch Φ1、 MOS switch Φ1e, MOS switch Φ2, MOS switch Φ2e, MOS switch ΦrstAnd MOS switch ΦenClock signal.
8. switched-capacitor integrator according to claim 7, the working frequency of the external clock is 6.144MHz.
9. switched-capacitor integrator according to claim 7, the MOS switch Φ1eIt is ahead of MOS switch Φ1Work, Working frequency is 3.072MHz；The MOS switch Φ2eIt is ahead of MOS switch Φ2Work, working frequency are 3.072MHz。
10. the switched-capacitor integrator according to claim 7 or 9, the MOS switch ΦenOperate continually at MOS switch ΦrstLater, and the MOS switch ΦenWith MOS switch ΦrstTotal working section and the MOS switch Φ2Or Φ2eWork Section is consistent.
CN201910421151.7A 2019-05-20 2019-05-20 Switched capacitor integrator Active CN110098810B (en)

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