CN109167577B - Low noise amplifier with envelope detection - Google Patents
Low noise amplifier with envelope detection Download PDFInfo
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- CN109167577B CN109167577B CN201811000364.4A CN201811000364A CN109167577B CN 109167577 B CN109167577 B CN 109167577B CN 201811000364 A CN201811000364 A CN 201811000364A CN 109167577 B CN109167577 B CN 109167577B
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- 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 the technical field of integrated circuits, and particularly relates to a low-noise amplifier with an envelope detection function. The low noise amplifier with the envelope detection function is added with an envelope detection branch circuit on the basis of the low noise amplifier, and the envelope detection branch circuit can extract an envelope before an input signal is amplified, change an input bias voltage, and accordingly suppress in-band interference, maintain a small noise figure and low power consumption, and is suitable for long-distance wireless application. The low noise amplifiers can also be used in cascade to further increase the signal to interference ratio. In order to reduce non-constant envelope disturbances caused by PVT variations, an envelope feedback loop is also proposed, which automatically calibrates the output envelope. The low-noise amplifier with the envelope detection function simultaneously considers two important indexes of a voltage dynamic range and noise performance, and provides a precondition for coexistence of multiple networks applied to a wireless network.
Description
Technical Field
The invention belongs to the technical field of integrated circuits, and particularly relates to a low-noise amplifier with an envelope detection function.
Background
With the development of the internet of things, the available Industrial Scientific Medical (ISM) bandwidth, such as the 2.4GHz band, becomes more and more crowded, and therefore, the wireless network faces the challenge of coexistence of multiple networks. In order to obtain a stable wireless connection, the receiver concerned is not only able to block out-of-band interference, but also to suppress high levels of in-band interference that cannot be filtered out during the front-end surface/body surface, however, in order to extend battery life, the most advanced application technology uses ultra-low supply voltages (< 1V), which is very disadvantageous to prevent in-band interference.
To improve interference while keeping power consumption low, some documents[1][2]The method has the advantages that the interference is blocked by adopting the nonlinear suppressors, the nonlinear technologies have two remarkable advantages, one is that the traditional technology relies on frequency and consumes a large amount of energy to realize high-Q value filtering, and different from the traditional technology, the nonlinear suppressors are independent of the frequency and only need to use envelope information of the interference to adjust a nonlinear equation so as to suppress the interference; second, their voltage dynamic range can be broadened by shifting the linear range, and thus is not affected by the supply voltage. However, these nonlinear suppressors need to trade off their noise performance against motionState-wide and therefore unsuitable for long-range wireless applications.
To solve the above problems, we provide a low noise amplifier with an envelope detection function that utilizes a nonlinear method to suppress interference while minimizing the deterioration of the noise figure.
[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.。
Disclosure of Invention
To overcome the above-mentioned drawbacks of the prior art, the present invention provides a low noise amplifier with envelope detection.
The low noise amplifier with envelope detection function provided by the invention is added with an envelope detection branch circuit on the basis of the low noise amplifier based on the phase inverter, and can acquire envelope information before an input signal is amplified and adjust the bias voltage of the input signal, so that the output of the low noise amplifier cannot be cut off by low power supply voltage.
Specifically, the envelope detection branch circuit is formed by sequentially connecting an envelope detector, a voltage multiplier and a mirror image bias circuit, wherein the output of the voltage multiplier is connected to a power supply of the mirror image bias circuit, the voltage multiplier plays a role in offsetting voltage change caused by the mirror image bias circuit, and the branch circuit can be connected to two ends of a blocking capacitor at the input end of the low-noise amplifier.
Further, the low noise amplifier with envelope detection function can improve the average noise figure by increasing the width-to-length ratio of the amplifier, so that the width-to-length ratio of the low noise amplifier is adjustable.
The low-noise amplifier with the envelope detection function can be used in a cascade mode, so that the signal-to-interference ratio is further improved; in the cascade low noise amplifier, each low noise amplifier is formed by connecting an envelope detector, a negative unit gain buffer, a voltage multiplier and a mirror image bias circuit in sequence; likewise, the output of the voltage multiplier is connected to the power supply of the mirror bias circuit.
Preferably, in order to reduce the influence of process, voltage and temperature (PVT) on the interference envelope, in the cascade-type low noise amplifier, each low noise amplifier may adopt a form of an envelope feedback loop to achieve the effect of automatically calibrating the output envelope, thereby increasing the interference blocking performance for the non-constant envelope.
Specifically, the envelope feedback loop circuit inputs a signal extracted from an envelope detector of an envelope detection branch of a next-stage amplifier and an output signal of a negative unit gain buffer period of an envelope detection branch of a current-stage amplifier into an error amplifier at the same time, and then is sequentially connected with a voltage multiplier and a mirror image bias circuit, so that the obtained bias signal is superposed to an input part of a low-noise amplifier, and the bias voltage of an input signal of the low-noise amplifier is dynamically adjusted.
The low-noise amplifier has the technical effects that the low-noise amplifier can inhibit in-band interference by adding the envelope detection branch circuit, keeps smaller noise coefficient and low power consumption and is suitable for long-distance wireless application. By using an envelope feedback loop the robustness of the low noise amplifier cascade with envelope detection functionality is further increased. The envelope detection branch and the envelope feedback loop are selectable, and can be selected according to the power consumption requirement of the system. The low-noise amplifier gives consideration to two important indexes of voltage dynamic range and noise performance at the same time, and provides a precondition for coexistence of multiple networks applied to a wireless network.
Drawings
Fig. 1 is a schematic diagram and functional comparison of the low noise amplifier with envelope detection function of the present invention and an inverter-based low noise amplifier.
Fig. 2 is a schematic diagram of a cascade form of the low noise amplifier with envelope detection function of the present invention.
Fig. 3 is a schematic diagram of the cascade of low noise amplifiers with envelope detection function of the present invention with the addition of an envelope feedback loop.
Reference numbers in the figures: an S1 bit envelope detection branch, an S11 envelope detector, an S12 voltage multiplier, an S13 mirror image bias circuit, an S14 negative unit gain buffer and an S2 error amplifier; vINFor input signal, VSIGFor inputting effective signals, VINTFor interfering signals, VREFFor the original input of a bias voltage, VPAs envelope information, VINaFor the input signal at the input of the gain stage of the low noise amplifier after changing the bias voltage, as the output voltage, CCIs a blocking capacitor; vOUT1Amplifying the output voltage, V, for the first stageOUT2For amplifying the output voltage, V, in a second stageP1Envelope information, V, extracted for the first-stage envelope detection branchP2For the extracted envelope information of the second stage envelope detection branch ED1, ED2, ED3 represent the envelope detectors in the first, second and third stage amplifier envelope detection branches, respectively, GE1、GE2Representing the gain of the error amplifier in the first and second stage amplifier envelope feedback loops, respectively.
Detailed Description
The present invention will be described more fully hereinafter in the reference to the accompanying drawings, which provide preferred embodiments of the invention, and which are not to be considered as limited to the embodiments set forth herein.
FIG. 1 shows the principle of interference suppression of the low noise amplifier with envelope detection in comparison with the conventional inverter-based low noise amplifier, inputting a valid signal VSIGAnd interference VINTAssuming a sine wave, it is clear that in the left diagram, the conventional inverter-based low noise amplifier will saturate when the interference is strong, and the signal is cut off by the supply voltage, losing valid information. In the right diagram, the low noise amplifier with envelope detection function incorporates an envelope detection branch, which can be used to detect the input signal VINExtracting envelope before amplification, the envelope detection path comprising an envelope detector, a voltage multiplier and a mirror bias circuit for matching the original inverter-based lowNoise amplifier consisting of a resistor RFA small size inverter implementation of feedback. Input V of low noise amplifier with envelope detection functionINWhile feeding into the envelope detector. His envelope VpIs extracted and fed to a voltage multiplier for compensating the output of the multiplier to VINaThe voltage is reduced by 2 times, and the multiplying power of the voltage multiplier is 2 times. Then, a bias voltage V is inputtedREFBecomes VREF+VPRealizing a nonlinear transfer function, improving VOUTThe signal to interference ratio of (c).
When V isINTWhen the noise is increased, the MOS tube of the low-noise amplifier is separated from a saturation region due to high interference, the average direct current is reduced, and the noise coefficient of the low-noise amplifier is deteriorated. Thus for large V in order to compensate for variations in noise figureINTThe transconductance of the amplifier can be increased while maintaining nearly constant current consumption.
The low noise amplifier with envelope detection function is used in a single-stage form, and the signal-to-interference ratio improvement is limited, so that a plurality of low noise amplifiers with envelope detection function can be cascaded to further improve the signal-to-interference ratio of a receiver. For example, fig. 2 shows a circuit diagram of a 2-stage low noise amplifier, the transconductance of the first and second stages of the amplifier being adjustable. In order to maintain the noise figure performance when there is a strong interferer, we set a large transconductance, e.g. 16. Because of the output signal V of the two-stage amplifierOUT1And VOUT2Is cut off by half, VINTo VOUT1Is opposite in phase, so a negative unity gain buffer is added after the envelope detector to ensure undipped VOUT1And VOUT2May be amplified.
Furthermore, to reduce PVT variation vsOUT1And VOUT2The present invention proposes an envelope feedback loop, as shown in fig. 3, to automatically calibrate the output envelope. The principle of the envelope feedback loop, V, is illustrated by taking a first stage low noise amplifier as an exampleOUT1Envelope V ofP2Extracted by a second-stage envelope detector ED2, and invertedIs fed to an error amplifier GE1He will amplify-VP1And VP2The amplified error is fed into a voltage multiplier and mirror bias circuit and then connected to the input of a low noise amplifier to adjust the input voltage bias. Although the envelope feedback loop may reduce VOUT1He also needs to trade off envelope detection speed against feedback loop stability because of spectral regrowth due to PVT variations. In short, the interference rejection performance of a non-constant envelope is ultimately determined by the bandwidth of the envelope feedback loop.
The low-noise amplifier with the envelope detection function provided by the invention has two important indexes of voltage dynamic range and noise performance, wherein the envelope detection branch and the envelope feedback loop are configurable and can be stopped for saving power consumption.
While the embodiments of the present invention have been described with reference to specific examples, those skilled in the art will readily appreciate that the various illustrative embodiments are capable of providing many other embodiments and that many other advantages and features of the invention are possible. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Claims (2)
1. A low noise amplifier with envelope detection function is characterized in that an envelope detection branch circuit is added on the basis of the low noise amplifier and is used for acquiring envelope information before an input signal is amplified and adjusting the bias voltage of the input signal, so that the output of the low noise amplifier cannot be cut off by low power supply voltage;
the envelope detection branch is formed by sequentially connecting an envelope detector, a voltage multiplier and a mirror image bias circuit, wherein the output of the voltage multiplier is connected to a power supply of the mirror image bias circuit, and the voltage multiplier is used for offsetting voltage change caused by the mirror image bias circuit; the envelope detection branch is connected with two ends of a blocking capacitor at the input end of the low-noise amplifier;
the low noise amplifier adopts a cascade form to further improve the signal interference ratio; in each stage of low noise amplifiers in the cascade form, an envelope detection branch is formed by sequentially connecting an envelope detector, a negative unit gain buffer, a voltage multiplier and a mirror image bias circuit; similarly, the output of the voltage multiplier is connected to the power supply of the mirror bias circuit;
in the cascade low noise amplifier, each low noise amplifier adopts an envelope feedback loop form to realize automatic calibration output so as to increase the interference blocking performance for non-constant envelope; wherein:
the envelope feedback loop circuit inputs a signal led out from an envelope detector of an envelope detection branch of a next stage of amplifier and an output signal of a negative unit gain buffer period of the envelope detection branch of the present stage of amplifier into an error amplifier at the same time, and then is sequentially connected with a voltage multiplier and a mirror image bias circuit, so that the obtained bias signal is superposed to an input part of a low-noise amplifier, and the bias voltage of the input signal of the low-noise amplifier is dynamically adjusted.
2. The low noise amplifier with envelope detection function according to claim 1, wherein the width-to-length ratio of the low noise amplifier is adjustable by increasing the width-to-length ratio of the amplifier to improve the average noise figure.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7064613B2 (en) * | 2002-03-25 | 2006-06-20 | Lucent Technologies Inc. | Amplifier bias system and method |
| KR100801872B1 (en) * | 2006-10-30 | 2008-02-11 | 지씨티 세미컨덕터 인코포레이티드 | Low noise amplifier with improved linearity |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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