Digitally-assisted if-sampling ADC with background-calibrated dynamic distortion compensation
Abstract/Contents
- Abstract
- Modern digital-beamforming phased-array systems enable cost-efficient common technology platforms that can be quickly deployed in many airborne or ground radar and communication applications. At the heart of the phased array receiver chain, multi-channel IF-Sampling Analog-to-Digital Converters (ADCs) serve the important purpose of down-converting the Intermediate Frequency (IF) signal to baseband and digitizing it for post-processing. The main design challenge of such ADCs is maintaining a good linearity performance across a wide input signal bandwidth while minimizing power consumption. In this thesis, we present an IF-Sampling ADC that consumes less power in the performance-limiting frontend and leverages the power of modern digital technology to post-correct the signal distortion in the digital domain. To satisfy the requirement of the target phased-array system, the ADC converts signals with 8-bit resolution at 1.25 GS/s sample rate. Our digital post-distortion filter uses a compact, derivative-based dynamic distortion model and enables ADC SFDR improvements of 10 dB for 2.5 GHz inputs. This ADC is the first to demonstrate correction model update in the background, in order to adapt to environmental variations (e.g., temperature variation). This continuous background calibration is enabled through a low sampling rate, on-chip auxiliary ADC that acquires high-linearity reference samples in real-time. Temperature sweeps from 10 °C to 80 °C confirm the scheme's robustness.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2017 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Chen, Si |
|---|---|
| Associated with | Stanford University, Department of Electrical Engineering. |
| Primary advisor | Murmann, Boris |
| Thesis advisor | Murmann, Boris |
| Thesis advisor | Horowitz, Mark (Mark Alan) |
| Thesis advisor | Wooley, Bruce A, 1943- |
| Advisor | Horowitz, Mark (Mark Alan) |
| Advisor | Wooley, Bruce A, 1943- |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Si Chen. |
|---|---|
| Note | Submitted to the Department of Electrical Engineering. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2017. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2017 by Si Chen
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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