Objectives of the Proposed Work
- To design an ASK-based wireless receiver implemented in 45-nm CMOS technology using a capacitive link.
- To enable simultaneous recovery of clock and data directly from the received ASK signal without requiring an additional clock wire or synchronization link.
- To implement ASK (Amplitude Shift Keying) modulation for simple, energy-efficient, and reliable biomedical data transmission.
- To develop a robust clock and data recovery (CDR) architecture suitable for multi-level ASK signals in implantable applications.
- To minimize bit errors caused by signal attenuation, noise, and distortion introduced by biological tissue and the capacitive channel.
- To convert the received analog, ASK waveform into clean digital signals, enabling accurate and efficient processing by digital circuits.
- To improve phase detection accuracy within the CDR using enhanced circuit techniques, ensuring stable timing and reduced jitter at high data rates.
- To achieve low-jitter and stable operation even under high-speed data transmission conditions.
- To reduce power consumption through 45-nm CMOS implementation, making the receiver suitable for low-power implantable biomedical devices.
- To ensure reliable operation across process, voltage, and temperature variations, leveraging the scalability and performance benefits of 45-nm CMOS technology.
- To simulate and analyse the complete receiver system using Tanner EDA tools, validating performance in terms of power, area, delay, BER, and overall functionality.
Proposed abstract:
Wireless biomedical implants are increasingly used in applications such as neural monitoring, health sensing, and implant programming, where fast and reliable data transfer with very low power consumption is essential. Capacitive based wireless links offer advantages such as high bandwidth, improved biosafety, and better tolerance to tissue properties compared to inductive and RF links, and making them suitable for high-speed implant communication. However, these links suffer from signal attenuation, distortion through biological tissue, and challenges in accurate with clock and data recovery when multi-level modulation schemes are used. From the Existing ASK traditional and conventional clock and data recovery circuits are mainly designed for binary signals and often experience higher error rates, increased jitter, and unreliable operation when handling weak multi-level signals under varying conditions. But it the recent systems, will have a additional synchronization links with complex architectures are often required, its also have increasing power consumption and system complexity. To address these limitations, this work proposes a low-power, high-speed ASK receiver front-end using a capacitive link, capable of reliably recovering both data and clock from a single received signal. The proposed design converts the received ASK waveform into stable PAM-4 digital levels and employs an improved clock and data recovery architecture with a highly linear trans conductance-based phase detector to enhance phase detection accuracy and reduce jitter. Adaptive biasing techniques are used to maintain linear operation over a wide input range, improving robustness against tissue-induced signal variations. The novelty of this work lies in the combination of PAM-4-based CDR operation and a highly linear phase detection approach optimized for biomedical capacitive links. The proposed receiver is evaluated through circuit-level simulations using Tanner EDA at 45nm CMOS Technology and validated using realistic operating conditions, also demonstrating low power consumption, improved signal integrity, stable clock recovery, and reliable high-speed performance suitable for implantable biomedical applications.
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A Low-Power High-Speed 4-ASK Receiver with PAM-4 Based Clock and Data Recovery for Capacitive Biomedical Wireless Links in 45-nm CMOS
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