Research in Nonlinearity of Surface Acoustic Wave Devices
Abstract
:1. Importance of Study on Nonlinear Effects in Surface Acoustic Wave Devices
- (1)
- Signal quality degradation: The main feature of signal quality is the specification of Error Vector Magnitude. This norm is used to measure the distance between the constellation points of the actual signal and its ideal position (the ideal position refers to the position of the constellation from which the signal is sent by the ideal transmitter or received by the ideal receiver).
- (2)
- New Spectrum Generation: Harmonics, second-order intermodulation distortion (IMD2), third-order intermodulation distortion (IMD3), and adjacent channel leakage ratio are the most common criteria used to evaluate the severity of spectral increase.
- (3)
- Desensitization: Desensitization is defined as the loss of receiver sensitivity due to the presence of Tx signals. The causes of Rx desensitization may be:
- (A)
- Rx noise generated by power amplifiers;
- (B)
- Tx leaks into the receiver due to the limited isolation of Tx and Rx, resulting in DC and RF frequency components falling into the receiving band of the direct-conversion receiver;
- (C)
- IMD2 and IMD3 fall in the Rx frequency band in the duplexer, thus reducing the SNR of the receiver. These IMDs are caused by intermodulation between Tx signals and external jamming signals (Jammers).
2. Generation Mechanism of Nonlinearity
3. Simulation Method of Nonlinearity in SAW Devices
3.1. Phenomenological Models
3.1.1. Nonlinear BVD Model
3.1.2. Nonlinear Mason Equivalent Circuit Model
3.1.3. Nonlinear P Matrix Model
3.1.4. Nonlinear COM Model
3.1.5. Nonlinear Rigorous COM and P Matrix Approach
3.1.6. Other Nonlinear Models
3.2. Precise Simulation Models
3.3. Comparison of Different Nonlinear Models
4. Experimental Measurement for Nonlinear Signals
- (1)
- The nonlinear characteristics of SAW devices are quite weak. Thus, if there is no precaution and a high dynamic range of the testing system, the nonlinearity of SAW will be prone to be overwhelmed by the nonlinearity of measurement equipment and peripheral circuits.
- (2)
- The power capacity of SAW devices is limited. Therefore, the imposed maximum input power of SAW devices is commonly no more than 36 dBm.
- (3)
- Under the condition of large-signal measurement, it can be found that the frequency responses of SAW devices suffer from the self-heating effect. Therefore, it is critical to select a measurement method which is insensitive to self-heating effects.
4.1. Harmonics Measurement
4.2. Intermodulation Measurement
4.3. Triple-Beat Measurement
5. Suppression for Nonlinear Effect
6. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Tian, Y.; Wang, L.; Wang, Y.; Li, Y.; Wu, H.; Qian, L.; Li, H.; Wu, J.; Wang, J. Research in Nonlinearity of Surface Acoustic Wave Devices. Micromachines 2021, 12, 1454. https://doi.org/10.3390/mi12121454
Tian Y, Wang L, Wang Y, Li Y, Wu H, Qian L, Li H, Wu J, Wang J. Research in Nonlinearity of Surface Acoustic Wave Devices. Micromachines. 2021; 12(12):1454. https://doi.org/10.3390/mi12121454
Chicago/Turabian StyleTian, Yahui, Litian Wang, Yuanyuan Wang, Yang Li, Haoxiang Wu, Lirong Qian, Honglang Li, Jinghui Wu, and Ji Wang. 2021. "Research in Nonlinearity of Surface Acoustic Wave Devices" Micromachines 12, no. 12: 1454. https://doi.org/10.3390/mi12121454