CN208479598U - Incremental digital analog converter applied to Temperature Humidity Sensor - Google Patents
Incremental digital analog converter applied to Temperature Humidity Sensor Download PDFInfo
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- CN208479598U CN208479598U CN201821193892.1U CN201821193892U CN208479598U CN 208479598 U CN208479598 U CN 208479598U CN 201821193892 U CN201821193892 U CN 201821193892U CN 208479598 U CN208479598 U CN 208479598U
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Abstract
The utility model relates to a kind of incremental digital analog converters applied to Temperature Humidity Sensor.The Switch capacitor structure that integrated circuit uses realizes that circuit reduces imbalance and error with Correlated Double Sampling, is made of two-stage integrators, and first order integrator is using gain bootstrap amplifier.The utility model circuit structure is clearly simple, has the advantages that high-precision, low-power consumption.
Description
Technical field
The utility model relates to a kind of incremental digital analog converters applied to Temperature Humidity Sensor.
Background technique
With the progress of Digital Signal Processing, contemporary society has come into digital times.With analog signal phase
Than, the realization that operation, storage and the transmission process of digital signal can be more convenient, therefore various digitizers are continuous
Enrich people's lives.However the signal in the presence of nature is usually analog signal, such as optical signal, voice signal, heat
Signal etc..These analog signals are made full use of to realize that intelligentized living environment is the direction that the mankind are continually striving to, such as
Phone, mobile phone have been invented to realize telecommunication；Exploitation light-operated lighting system can realize when night came automatic illuminating；
People devise temperature monitoring, the products such as electronic thermometer also by the reasonable thermal signal that receives.All collect in these electronic instruments
At analog-digital converter module (ADC), come realize analog signal to digital signal conversion process.
Modern signal processing system is in the stage of rapid development at present, and the frequency range of input signal is more and more wider,
There is demand from low frequency even DC signal to ultra-high frequency signal.Moreover, for the conversion accuracy of various input datas, place
The also higher and higher therefore traditional adc circuit structures of requirements such as reason speed are no longer able to satisfy application demand complicated and changeable.It is passing
Sensor application field, especially various instrument and meter fields of measurement and field of humiture measurement, the analog signal of system input
Amount is usually low frequency signal, even direct current signal, and input frequency often only has several Hz sizes.At this point, in analog-digital converter
Offset voltage, 1/fThe influence of the non-ideal factors such as noise will be protruded more, can greatly reduce ADC conversion accuracy.Traditional
Sigma-Delta ADC is since relatively often work is under the conditions of high-frequency input signal, to 1/fThe inhibitory effect of noise etc. is simultaneously
It is not strong, field of humiture measurement can not be applied to, therefore circuit design mainly considers to reduce the shadow of the factors such as imbalance and thermal noise
It rings.
Summary of the invention
The purpose of this utility model is to provide a kind of incremental digital analog converter applied to Temperature Humidity Sensor, the numbers
Mode converter circuit structure is clearly simple, has the advantages that high-precision, low-power consumption.
To achieve the above object, the technical solution of the utility model is: a kind of incremental applied to Temperature Humidity Sensor
Digital analog converter, the positive input connection circuit including differential signal connect circuit with the negative input of differential signal；The difference letter
Number positive input connect circuit are as follows: the positive input of differential signal is through first switch, capacitor CS1、CcdsWith one end of second switch,
The inverting input terminal of one operational amplifier connects, and the positive input of differential signal is also through third switch, capacitor C1With capacitor C2、C3's
The inverting input terminal connection of one end, one end of the 4th switch, comparator, third switch and capacitor C1Junction between through the 5th
Switch is connected to bias voltage source, first switch and capacitor CS1Junction between through the 6th switch after, respectively through the 7th switch
Reference voltage source anode and reference voltage source cathode, capacitor C are connected to the 8th switchS1With CcdsJunction between also through
Nine switches are connected to bias voltage source, capacitor CS1With CcdsJunction between also through the tenth switch with capacitor Cint1One end connect
It connects, the other end and capacitor C of second switchint1One end connection, capacitor Cint1The other end and the first operational amplifier anode
Output end connection, capacitor Cint1The other end also through the 11st switch with capacitor CS2One end, capacitor C2The other end, the 12nd
One end of switch connects, capacitor CS2The other end with the 13rd switch one end connect, the 12nd switch the other end and the tenth
The other end of three switches, which is connected, is connected to bias voltage source, capacitor CS2The other end also through the 14th switch and second operational amplifier
Inverting input terminal, capacitor Cint2One end connection, capacitor Cint2The other end and second operational amplifier cathode output end connect
It connects, capacitor Cint2The other end also through the 15th switch with capacitor C3The other end, sixteenmo close one end connection, the 16th
The other end of switch is connected with the other end of the 4th switch is connected to bias voltage source；The negative input of the differential signal connects circuit
It is corresponding with the positive input of differential signal connection circuit；Wherein, second, the nine, the 13rd switches are controlled by switch control signal S1
System, the four, the ten, the 14th switch controlled by switch control signal S2, first, third, the 11st, the 15th switch by switching
Control signal S1d control, the five, the six, the 12nd, sixteenmo pass controlled by switch control signal S2d, the 7th switch by than
It is controlled compared with device cathode output signal, the 8th switch is controlled by comparator anode output signal, and switch control signal S1, S2 is a pair
Non-overlapping clock signal, switch control signal S1d, S2d are respectively the delay clock signals of switch control signal S1, S2.
In an embodiment of the utility model, first operational amplifier is realized using gain bootstrap structure, main amplifier
70dB gain is realized respectively with gain compole amplifier.
In an embodiment of the utility model, first operational amplifier include amplifier biasing circuit, it is inclined with the amplifier
Circuits link folded sleeve formula amplifier structural circuit, and amplifier biasing circuit provides reference current by Bandgap circuit.
Compared to the prior art, the utility model has the following beneficial effects: the utility model circuit structure is clearly simple,
Have the advantages that high-precision, low-power consumption.
Detailed description of the invention
Fig. 1 is the incremental digital-to-analog converter structures figure applied to Temperature Humidity Sensor.
Fig. 2 is the circuit structure diagram of amplifier OTA1.
Fig. 3 is chip output code flow frequency spectrum analogous diagram.
Fig. 4 is the input-output voltage curve under different reference voltages.
Specific embodiment
With reference to the accompanying drawing, the technical solution of the utility model is specifically described.
The utility model provides a kind of incremental digital analog converter applied to Temperature Humidity Sensor, including differential signal
Positive input connection circuit with the negative input of differential signal connect circuit；The positive input of the differential signal connects circuit are as follows: poor
The positive input of sub-signal is through first switch, capacitor CS1、CcdsWith the anti-phase input of one end of second switch, the first operational amplifier
End connection, the positive input of differential signal is also through third switch, capacitor C1With capacitor C2、C3One end, the 4th switch one end, ratio
Inverting input terminal compared with device connects, third switch and capacitor C1Junction between through the 5th switch be connected to bias voltage source,
First switch and capacitor CS1Junction between through the 6th switch after, respectively through the 7th switch and the 8th switch be connected to benchmark electricity
Potential source anode and reference voltage source cathode, capacitor CS1With CcdsJunction between also through the 9th switch be connected to bias voltage source,
Capacitor CS1With CcdsJunction between also through the tenth switch with capacitor Cint1One end connection, the other end of second switch and electricity
Hold Cint1One end connection, capacitor Cint1The other end connect with the cathode output end of the first operational amplifier, capacitor Cint1It is another
One end is also through the 11st switch and capacitor CS2One end, capacitor C2The other end, the 12nd switch one end connection, capacitor CS2's
The other end is connect with one end of the 13rd switch, and the other end of the 12nd switch is connected with the other end of the 13rd switch to be connected to partially
Set voltage source, capacitor CS2The other end also through the 14th switch and the inverting input terminal of second operational amplifier, capacitor Cint2's
One end connection, capacitor Cint2The other end and second operational amplifier cathode output end connect, capacitor Cint2The other end also pass through
15th switch and capacitor C3The other end, sixteenmo close one end connection, sixteenmo close the other end with the 4th switch
The other end be connected be connected to bias voltage source；The negative input connection circuit of the differential signal and the positive input of differential signal connect
Circuit is corresponding；Wherein, second, the nine, the 13rd switches are controlled by switch control signal S1, the four, the ten, the 14th switches
Controlled by switch control signal S2, first, third, the 11st, the 15th switch controlled by switch control signal S1d, the 5th, the
Six, the ten two, sixteenmo pass is controlled by switch control signal S2d, and the 7th switch is controlled by comparator cathode output signal, the
Eight switches are controlled by comparator anode output signal, and switch control signal S1, S2 is a pair of non-overlapping clock signal, switch control
Signal S1d, S2d are respectively the delay clock signals of switch control signal S1, S2.
First operational amplifier realizes that main amplifier and gain compole amplifier are realized respectively using gain bootstrap structure
70dB gain.First operational amplifier includes amplifier biasing circuit, links folded sleeve formula fortune with the amplifier biasing circuit
Structural circuit is put, amplifier biasing circuit provides reference current by Bandgap circuit.
The following are the specific implementation processes of the utility model.
The utility model devises a kind of second order CIFF structure increment formula Sigma-Delta ADC structure, realizes a
ADC applied to Temperature Humidity Sensor field.Circuit reduces imbalance and error, first order integral with Correlated Double Sampling
Device uses gain bootstrap amplifier, and gain uses sinc up to 145dB, digital filterLStructure.Chip is based on 0.18 μm of SMIC
Process simulation and flow, chip real estate 0.211mm2.Test result shows that ADC output signal-to-noise ratio SNR is 99.8dB, reaches
To 16.5bit effective accuracy, entire 228 μ W of modulator power consumption, quality factor FOMwFor 4.1pJ/conv.
Fig. 1 is the physical circuit figure of the utility model, the switch control signal S in figure1And S2It is a pair of non-overlapping clock,
S1d、S2dIt is S respectively1、S2Delay clock, OTA1 and OTA2 are operational amplifiers, and wherein the gain of OTA1 is up to 145dB.It adjusts
The first order of device processed is in S2Phase is sampled, in S1Phase is integrated.The second level is in S1It is sampled when phase, S2Phase
Shi Jifen differs half of clock phase with the output of first order integrator.And capacitive part of summing is in S1Phase is sampled, and straight
It connects by summed result input comparator, in S2Phase only resets the charge on capacitor.Circuit work rises main in low-frequency range
The noise of effect is 1/f noise and offset voltage.Offset voltage can be looked at as low frequency input reference noise, in order to eliminate
It, we use Correlated Double Sampling (CDS) herein, in sampling phase S1, amplifier noise and switching noise are stored in
Capacitor CcdsOn, then in S2Phase eliminates noise.In order to sufficiently inhibit low-frequency noise, meet required precision, first order amplifier
Need to reach 140dB gain, second level amplifier realizes 80dB gain.The amplifying power of common Foldable cascade structure is
It is not able to satisfy the requirement of first order amplifier.Therefore, first order amplifier OTA1 is realized using gain bootstrap structure, main amplifier and gain
Compole amplifier realizes 70dB gain respectively, and circuit structure is as shown in Fig. 2, be amplifier biasing circuit, benchmark electricity in dotted line frame
Stream IB is generated by Bandgap circuit.It is folded sleeve formula amplifier structure outside dotted line frame.M2、M3It is amplifier Differential Input to pipe, adopts
It uses PMOS tube that there is smaller 1/f noise compared to NMOS tube as input, and bigger unit gain frequency can be provided.
M1、M6、M7And M12、M13For current source.M8、M9And M10、M11Form cascode structure.PMOS tube M4、M5Gate voltage be total
Mould feedback control end.Wherein the compensating electric capacity Cc of amplifier output end is in order to which improve amplifier establishes characteristic.Amplifier otan, otap
For gain compole.Common-mode feedback uses the common mode feedback circuit of Switch capacitor structure (SC-CMFB).
In terms of digital filter, direct current or low frequency are inputted, inhibit the interference of ambient noise particularly significant.Consider
Influence to various non-ideal factors to circuit performance, the utility model use a kind of high-performance filter circuit --- sincLFilter
Wave device.sincLFilter can inhibit periodic noise to interfere well, play the role of optimizing modulator performance.
The simulation result of the incremental digital-to-analogue dress parallel operation of the utility model is as shown in figure 3, simulation result shows simulation waveform
Display chip realizes 2 rank noise shaping functions, and figure Middle and low frequency noise energy level can effectively be located in -120dB or so
Manage low frequency even direct current signal.It analyzes to obtain modulator Signal to Noise Ratio (SNR) by MATLAB and number of significant digit ENOB is respectively
99.8dB,16.5bit.Fig. 4 is linearity simulation scenarios of the same chip under different reference voltages.Although can be seen that base
Quasi- voltage is different, and the linearity and output accuracy are still good.
It is the preferred embodiment of the utility model above, it is all to change according to made by technical solutions of the utility model, it is produced
Function without departing from technical solutions of the utility model range when, belong to the protection scope of the utility model.
Claims (3)
1. a kind of incremental digital analog converter applied to Temperature Humidity Sensor, which is characterized in that just defeated including differential signal
Enter to connect circuit and connects circuit with the negative input of differential signal；The positive input of the differential signal connects circuit are as follows: differential signal
Positive input through first switch, capacitor CS1、CcdsIt is connect with the inverting input terminal of one end of second switch, the first operational amplifier,
The positive input of differential signal is also through third switch, capacitor C1With capacitor C2、C3One end, the 4th switch one end, comparator it is anti-
The connection of phase input terminal, third switch and capacitor C1Junction between through the 5th switch be connected to bias voltage source, first switch
With capacitor CS1Junction between through the 6th switch after, respectively through the 7th switch and the 8th switch be connected to reference voltage source anode
With reference voltage source cathode, capacitor CS1With CcdsJunction between also through the 9th switch be connected to bias voltage source, capacitor CS1
With CcdsJunction between also through the tenth switch with capacitor Cint1One end connection, the other end of second switch and capacitor Cint1's
One end connection, capacitor Cint1The other end connect with the cathode output end of the first operational amplifier, capacitor Cint1The other end also pass through
11st switch and capacitor CS2One end, capacitor C2The other end, the 12nd switch one end connection, capacitor CS2The other end with
One end connection of 13rd switch, the other end of the 12nd switch is connected with the other end of the 13rd switch is connected to bias voltage
Source, capacitor CS2The other end also through the 14th switch and the inverting input terminal of second operational amplifier, capacitor Cint2One end connect
It connects, capacitor Cint2The other end and second operational amplifier cathode output end connect, capacitor Cint2The other end also through the 15th
Switch and capacitor C3The other end, sixteenmo close one end connection, sixteenmo close the other end with the 4th switch it is another
End, which is connected, is connected to bias voltage source；The negative input connection circuit and the positive input of differential signal of the differential signal connect circuit phase
It is corresponding；Wherein, second, the nine, the 13rd switches are controlled by switch control signal S1, and the four, the ten, the 14th switches are by switching
Control signal S2 control, first, third, the 11st, the 15th switch controlled by switch control signal S1d, the 5th, the 6th, the
12, sixteenmo pass is controlled by switch control signal S2d, and the 7th switch is controlled by comparator cathode output signal, and the 8th opens
It closes and is controlled by comparator anode output signal, switch control signal S1, S2 is a pair of non-overlapping clock signal, switch control signal
S1d, S2d are respectively the delay clock signals of switch control signal S1, S2.
2. the incremental digital analog converter according to claim 1 applied to Temperature Humidity Sensor, which is characterized in that described
First operational amplifier realizes that main amplifier and gain compole amplifier realize 70dB gain respectively using gain bootstrap structure.
3. the incremental digital analog converter according to claim 2 applied to Temperature Humidity Sensor, which is characterized in that described
First operational amplifier includes amplifier biasing circuit, links folded sleeve formula amplifier structural circuit with the amplifier biasing circuit, fortune
It puts biasing circuit and provides reference current by Bandgap circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821193892.1U CN208479598U (en) | 2018-07-26 | 2018-07-26 | Incremental digital analog converter applied to Temperature Humidity Sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821193892.1U CN208479598U (en) | 2018-07-26 | 2018-07-26 | Incremental digital analog converter applied to Temperature Humidity Sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146558A (en) * | 2019-06-18 | 2019-08-20 | 福州大学 | Reading circuit and its control method applied to capacitance type humidity sensor |
| CN110798221A (en) * | 2019-11-25 | 2020-02-14 | 苏州华芯微电子股份有限公司 | Signal modulation circuit |
-
2018
- 2018-07-26 CN CN201821193892.1U patent/CN208479598U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146558A (en) * | 2019-06-18 | 2019-08-20 | 福州大学 | Reading circuit and its control method applied to capacitance type humidity sensor |
| CN110798221A (en) * | 2019-11-25 | 2020-02-14 | 苏州华芯微电子股份有限公司 | Signal modulation circuit |
| WO2021103851A1 (en) * | 2019-11-25 | 2021-06-03 | 苏州华芯微电子股份有限公司 | Signal modulation circuit |
| CN110798221B (en) * | 2019-11-25 | 2022-02-08 | 苏州华芯微电子股份有限公司 | Signal modulation circuit |
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Granted publication date: 20190205 |