CN109167577A - Low-noise amplifier with envelope detected function - Google Patents
Low-noise amplifier with envelope detected function Download PDFInfo
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- CN109167577A CN109167577A CN201811000364.4A CN201811000364A CN109167577A CN 109167577 A CN109167577 A CN 109167577A CN 201811000364 A CN201811000364 A CN 201811000364A CN 109167577 A CN109167577 A CN 109167577A
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- low
- envelope
- noise amplifier
- noise
- envelope detected
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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
- H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
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Abstract
The invention belongs to technical field of integrated circuits, specially with the low-noise amplifier of envelope detected function.The low-noise amplifier with envelope detected function is added to an envelope detected branch on the basis of low-noise amplifier, it can extract envelope before input signal is amplified, change input offset voltage, to inhibit with interior interference, lesser noise coefficient and low-power consumption are kept simultaneously, and are suitble to the wireless application of long range.The low-noise amplifier can also cascade use, further increase signal-to-noise ratio.In order to reduce non-constant-envelope interference caused by PVT changes, it is also proposed that a kind of envelope feedback loop can calibrate output envelope automatically.This low-noise amplifier with envelope detected function combines two important indicators of voltage dynamic range and noiseproof feature, and multi-network coexisted for wireless network application provides precondition.
Description
Technical field
The invention belongs to technical field of integrated circuits, and in particular to a kind of low noise amplification with envelope detected function
Device.
Background technique
With the development of Internet of Things, available industrial scientific medical (ISM) bandwidth, such as 2.4GHz frequency range, become
It is more and more crowded, therefore wireless network is faced with the challenge that more nets coexist.A stable wireless connection, correlation connect in order to obtain
Device is received not only to want that out-of-band interference can be blocked, and to be able to suppress it is high-intensitive can not be by during front end sound surface/body surface face
Filter away with interior interference, however, in order to extend battery life, state-of-the-art application technology has been all made of ultra-low power supply voltage
(≤1V), this is highly detrimental to interference in preventing belt.
Low-power consumption, some documents are kept again in order to improve interference[1][2]Propose using non-linear suppressor block it is dry
It disturbs, these nonlinear technologies are there are two remarkable advantage, first, traditional technology dependent Frequency and a large amount of energy consumptions of consumption realize height
Q value filtering, different from traditional technology, non-linear suppressor is unrelated with frequency and only needs to come using the envelope information of interference
Nonlinear equation is adjusted, and then inhibits interference；Second, their voltage dynamic range can be opened up by the mobile range of linearity
Width, therefore do not influenced by supply voltage.However these non-linear suppressors need to weigh their noiseproof feature and dynamic model
It encloses, therefore is not suitable for long range wireless application.
More than solving the problems, such as, we provide a kind of low-noise amplifier with envelope detected function, its benefits
Inhibited to interfere with nonlinear method, while minimizing the deterioration of noise coefficient.
[1] E. J.G. Janssen et al., “A 1.8GHz Amplifier with 39dB Frequency-
Independent Smart Self-Interference Blocker Suppression,” RFIC Symp. Dig. Papers, pp. 98-100, Jun. 2012
[2] D. Ye et al., “An Ultra-Low-Power Receiver Using Transmitted-
Reference and Shifted-Limiters for In-band Interference Resilience,” ISSCC Dig. Tech. Papers, pp. 438-439, Feb. 2016.。
Summary of the invention
The shortcomings that overcome the above-mentioned prior art, the present invention provide a kind of low noise amplification with envelope detected function
Device.
Low-noise amplifier provided by the invention with envelope detected function, it is in the low noise amplification based on phase inverter
An envelope detected branch is added on the basis of device, it can extract envelope information before input signal is amplified, and adjust defeated
The output of low-noise amplifier is truncated will not by low supply voltage in the bias voltage for entering signal.
Specifically, envelope detected branch routing envelope detector, voltage multiplier and mirror image biasing circuit are sequentially connected group
At, wherein the output of voltage multiplier is connected at the power supply of mirror image biasing circuit, and voltage multiplier, which plays, offsets mirror image biasing
The effect of voltage change caused by circuit, the branch are attached to the both ends of the capacitance of low-noise amplifier input terminal.
Further, the low-noise amplifier with envelope detected function can be changed by increasing the breadth length ratio of amplifier
Kind average noise factor, therefore the breadth length ratio of low-noise amplifier is adjustable.
Low-noise amplifier proposed by the present invention with envelope detected function can be used using cascade form, from
And further improve signal-to-noise ratio；In the low-noise amplifier of cascade form, low-noise amplifiers at different levels, envelope detected branch
It is sequentially connected and is formed by envelope detector, negative unity gain buffer, voltage multiplier and mirror image biasing circuit；Likewise, electric
The output of pressure multiplier is connected at the power supply of mirror image biasing circuit.
Preferably, in order to reduce the influence of technique, voltage, temperature (PVT) to interference envelope, in the low of above-mentioned cascade form
In noise amplifier, a kind of form of envelope feedback loop is can be used in low-noise amplifiers at different levels, to reach automatic calibration output
The effect of envelope, so that the interference increased for non-constant-envelope blocks performance.
Specifically, the envelope feedback loop circuit, draws from the envelope detector of next stage amplifier envelope detected branch
The output signal of signal and the negative Unity-gain buffer phase of the same level amplifier envelope detected branch input an error simultaneously and put out
Then big device is sequentially connected with voltage multiplier and mirror image biasing circuit, obtained offset signal is superimposed to low-noise amplifier
Importation, dynamic adjustment is carried out to the bias voltage of low-noise amplifier input signal.
The solution have the advantages that the low-noise amplifier can be inhibited by adding envelope detected branch with interior dry
It disturbs, while keeping lesser noise coefficient and low-power consumption, and be suitble to the wireless application of long range.By using envelope feedback ring
Road further increases the cascade robustness of low-noise amplifier with envelope detected function.Wherein envelope detected branch
It is option with envelope feedback loop, can be made a choice according to the power consumption demand of system.The low-noise amplifier combines
Voltage dynamic range and noiseproof feature two important indicators, multi-network coexisted for wireless network application provide premise item
Part.
Detailed description of the invention
Fig. 1 is the low-noise amplifier with envelope detected function and the low-noise amplifier based on phase inverter of the invention
Schematic diagram and function comparison.
Fig. 2 is the cascade form schematic diagram of the low-noise amplifier with envelope detected function of the invention.
Fig. 3 is that there is the low-noise amplifier of envelope detected function to be added to showing for envelope feedback loop for cascade of the invention
It is intended to.
Figure label: S1 envelope detected branches, S11 are envelope detector, and S12 is voltage multiplier, and S13 is that mirror image is inclined
Circuits, S14 are negative unity gain buffer, and S2 is error amplifier；VINFor input signal, VSIGTo input useful signal,
VINTFor interference signal, VREFFor former input offset voltage, VPFor envelope information, VINaTo change low noise amplification after bias voltage
The input signal of device gain stage input is output voltage, CCFor capacitance；VOUT1Amplify output voltage for the first order,
VOUT2Amplify output voltage, V for the second levelP1For the envelope information that first order envelope detected branch extracts, VP2For second level envelope
The envelope information that detection branch is extracted, ED1, ED2, ED3 respectively indicate first, second, third grade of amplifier envelope detected branch
In envelope detector, GE1、GE2Respectively indicate the increasing of the error amplifier in first, second grade of amplifier envelope feedback loop
Benefit.
Specific embodiment
The present invention is described more fully below in association with being shown in reference implementation example, the present invention provides preferred implementation
Example, but should not be considered limited to embodiment set forth herein.
Fig. 1 shows the low-noise amplifier and traditional low noise amplification based on phase inverter with envelope detected function
The interference mitigation principle of device compares, and inputs useful signal VSIGWith interference VINTIt is assumed to be sine wave, it is clear that in left figure, traditional base
It will be saturated in the low-noise amplifier of phase inverter when interfering strong, signal is truncated by supply voltage, loses effective information.And
In right figure, the low-noise amplifier with envelope detected function introduces envelope detected branch, he can be in input signal VINQuilt
Envelope is extracted before amplification, envelope detected path is made of envelope detector, voltage multiplier and mirror image biasing circuit, and the mirror image is inclined
Circuits are in order to match former base in the low-noise amplifier of phase inverter, by having resistance RFThe small size phase inverter of feedback is realized.
The input V of low-noise amplifier with envelope detected functionINEnvelope detector is fed simultaneously.His envelope VpIt is extracted and send
Enter voltage multiplier, is output to V in order to compensate for from multiplierINaThe decline of 2 times of voltages, the multiplying power of voltage multiplier is 2 times.It
Afterwards, input offset voltage VREFBecome VREF+VP, a non-linear transfer function is realized, V is improvedOUTThe signal interference at place
Than.
Work as VINTWhen increase, since high interference makes the metal-oxide-semiconductor of low-noise amplifier leave saturation region, average DC current
Become smaller, the noise coefficient of low-noise amplifier is caused to be deteriorated.Therefore in order to compensate for the variation of noise coefficient, for big VINT, can
To increase the mutual conductance of amplifier and maintain almost unchanged current power dissipation.
Low-noise amplifier with envelope detected function is used in the form of single-order, its signal-to-noise ratio improvement is that have
Limit, therefore we can cascade multiple low-noise amplifiers with envelope detected function further to improve the letter of receiver
Number interference ratio.For example, Fig. 2 shows the circuit diagram of 2 grades of low-noise amplifiers, the mutual conductance of the amplifier first order and the second level
It is adjustable.When there is a very strong interference, in order to keep noise-figure performance, a big mutual conductance is arranged in we, such as
16.Because of the output signal V of dual-stage amplifierOUT1And VOUT2Half reduced, VINTo VOUT1Opposite in phase, so wrapping
A negative unity gain buffer is added after network detector, to guarantee the V not reducedOUT1And VOUT2It can be amplified.
In addition, in order to reduce PVT variation to VOUT1And VOUT2Envelope bring influences, and the invention proposes a kind of envelope is anti-
Loop version is presented, as shown in figure 3, it is made to calibrate output envelope automatically.Illustrate envelope by taking first order low-noise amplifier as an example
The principle of feedback control loop, VOUT1Envelope VP2It is extracted by second level envelope detector ED2, feeds back to error amplifier GE1,
He is by amplification-VP1And VP2Envelope error, the error of amplification is admitted to voltage multiplier and mirror image biasing circuit, then connects
Input voltage biasing is adjusted to the input terminal of low-noise amplifier.Although envelope feedback loop can reduce VOUT1Because of PVT
Spectral re-growth caused by changing, he is also required to the stability of tradeoff envelope detected speed and feedback control loop.In simple terms, non-perseverance
The interference for determining envelope, which blocks performance, to be determined by the bandwidth of envelope feedback loop.
Low-noise amplifier proposed by the present invention with envelope detected function has taken into account voltage dynamic range and noise-induced
Can two important indicators, wherein envelope detected branch and envelope feedback loop are configurable, or saving power consumption and
It deactivates.
Illustrate embodiments of the present invention above by specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
Claims (4)
1. a kind of low-noise amplifier with envelope detected function, which is characterized in that add on the basis of low-noise amplifier
Add an envelope detected branch, for extracting envelope information before input signal is amplified, adjusts the biased electrical of input signal
Pressure, be truncated the output of low-noise amplifier will not by low supply voltage；
The envelope detected branch routing envelope detector, voltage multiplier and mirror image biasing circuit are sequentially connected composition, wherein electricity
The output of pressure multiplier is connected at the power supply of mirror image biasing circuit, and voltage multiplier is for offsetting caused by mirror image biasing circuit
Voltage change；The envelope detected branch is connected to the both ends of the capacitance of low-noise amplifier input terminal.
2. the low-noise amplifier according to claim 1 with envelope detected function, which is characterized in that put by increasing
The breadth length ratio of big device improves average noise factor, and the breadth length ratio of low-noise amplifier is adjustable.
3. the low-noise amplifier according to claim 1 with envelope detected function, which is characterized in that low noise amplification
Device uses cascade form, further to improve signal-to-noise ratio；In low-noise amplifiers at different levels in cascade form, envelope detected
Branch routing envelope detector, negative unity gain buffer, voltage multiplier and mirror image biasing circuit are sequentially connected composition；Equally
, the output of voltage multiplier is connected at the power supply of mirror image biasing circuit.
4. the low-noise amplifier according to claim 3 with envelope detected function, which is characterized in that in the cascade
In the low-noise amplifier of form, low-noise amplifiers at different levels use a kind of form of envelope feedback loop, to realize automatic school
Quasi- output, to increase the interference blocking performance for non-constant-envelope；Wherein:
The envelope feedback loop circuit draws signal and the same level from the envelope detector of next stage amplifier envelope detected branch
The output signal of the negative Unity-gain buffer phase of amplifier envelope detected branch inputs an error amplifier simultaneously, then with electricity
Pressure multiplier and mirror image biasing circuit are sequentially connected, and obtained offset signal is superimposed to the importation of low-noise amplifier, right
The bias voltage of low-noise amplifier input signal carries out dynamic adjustment.
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| CN201811000364.4A CN109167577B (en) | 2018-08-30 | 2018-08-30 | Low noise amplifier with envelope detection |
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| CN201811000364.4A CN109167577B (en) | 2018-08-30 | 2018-08-30 | Low noise amplifier with envelope detection |
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| CN109167577B CN109167577B (en) | 2022-04-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112152578A (en) * | 2020-09-15 | 2020-12-29 | 中国科学院微电子研究所 | Modulation signal demodulation circuit, demodulation method and electronic equipment |
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| US20030179048A1 (en) * | 2002-03-25 | 2003-09-25 | Arild Kolsrud | Amplifier bias system and method |
| US20080252377A1 (en) * | 2006-10-30 | 2008-10-16 | Lee Seung-Wook | Low noise amplifier having improved linearity |
| CN101777929A (en) * | 2009-12-29 | 2010-07-14 | 清华大学深圳研究生院 | Ultra wide band receiver for realizing down frequency mixing based on nonlinear preprocessing |
| KR20160096288A (en) * | 2015-02-04 | 2016-08-16 | 한국전자통신연구원 | Envelope-tracking modulator for reducing spurious noise and receiver band noise and power amplifier with envelope-tracking modulator |
| CN105917579A (en) * | 2014-02-24 | 2016-08-31 | 瑞典爱立信有限公司 | Amplifier system and method |
| CN106301251A (en) * | 2016-08-12 | 2017-01-04 | 东南大学 | A kind of High Linear power amplifier structure based on feedback technique |
-
2018
- 2018-08-30 CN CN201811000364.4A patent/CN109167577B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030179048A1 (en) * | 2002-03-25 | 2003-09-25 | Arild Kolsrud | Amplifier bias system and method |
| US20080252377A1 (en) * | 2006-10-30 | 2008-10-16 | Lee Seung-Wook | Low noise amplifier having improved linearity |
| CN101777929A (en) * | 2009-12-29 | 2010-07-14 | 清华大学深圳研究生院 | Ultra wide band receiver for realizing down frequency mixing based on nonlinear preprocessing |
| CN105917579A (en) * | 2014-02-24 | 2016-08-31 | 瑞典爱立信有限公司 | Amplifier system and method |
| KR20160096288A (en) * | 2015-02-04 | 2016-08-16 | 한국전자통신연구원 | Envelope-tracking modulator for reducing spurious noise and receiver band noise and power amplifier with envelope-tracking modulator |
| CN106301251A (en) * | 2016-08-12 | 2017-01-04 | 东南大学 | A kind of High Linear power amplifier structure based on feedback technique |
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| CN112152578A (en) * | 2020-09-15 | 2020-12-29 | 中国科学院微电子研究所 | Modulation signal demodulation circuit, demodulation method and electronic equipment |
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