Gate-Biased Self-Mixer Wake-Up Receiver for Low-Power Detection
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently operating wake-up receivers in deep sleep mode to conserve power while ensuring timely reception of asynchronous communications.
Innovation Solution
The development of circuits and methods for wake-up receivers, specifically utilizing a gate-biased self-mixer with a configuration of NMOS and PMOS transistors, coupling capacitors, and bias resistors to optimize input resistance and capacitance for improved sensitivity and power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the receiver operates in deep sleep mode to conserve power, then power consumption is reduced, but the ability to receive asynchronous communications timely is degraded
Solution Approach 1:
The receiver is divided into two separate functional blocks: a low-power wake-up receiver that remains active and a main receiver that operates in deep sleep mode. The wake-up receiver specifically detects wake-up signals and triggers the main receiver only when needed, segmenting the reception function to resolve the contradiction between power saving and timely reception capability.
Solution Approach 2:
The wake-up receiver acts as an intermediary between the deep sleep state and the full reception state. It continuously monitors for wake-up signals and serves as a mediator that activates the main receiver only when a wake-up signal is detected, enabling the system to transition from power-saving mode to active reception mode seamlessly.
2Use of energy by moving object
If a low-power wake-up receiver is used to detect wake-up signals, then power consumption is reduced, but sensitivity and noise performance are degraded
Solution Approach 1:
The wake-up receiver is designed with specific local optimizations including a self-mixer architecture with gate biasing that enhances sensitivity and noise performance at the critical detection point. The input stage uses carefully selected transistor configurations and biasing networks to improve signal detection capability specifically where needed, rather than uniformly across the entire receiver.
Solution Approach 2:
The self-mixer stage employs gate biasing to dynamically adjust operating parameters such as transconductance and input impedance. By optimizing the gate bias voltage, the receiver achieves improved sensitivity and noise performance while maintaining low power consumption, effectively changing key operational parameters to resolve the contradiction.
3Reliability
If the main receiver is turned ON in response to wake-up signals, then reception capability is improved, but power consumption increases
Solution Approach 1:
The system operates in periodic cycles of deep sleep and active reception. The wake-up receiver continuously monitors for signals, and upon detecting a wake-up signal, triggers the main receiver to activate. This periodic on-demand operation allows the main receiver to remain off during most periods, reducing overall power consumption while maintaining full reception capability when needed.
Solution Approach 2:
The wake-up receiver autonomously monitors for wake-up signals and self-triggers the main receiver activation without external intervention. This self-service mechanism ensures that the main receiver is activated only when necessary, optimizing the balance between reception capability and power consumption by eliminating unnecessary activations.
Data Source
AI summary
Circuit for wake-up receivers are provide. In some embodiments, the wake-up receivers include self-mixers that receive a gate bias voltage. Some of the self-mixers are single ended and some are differential. In some embodiments, the wake-up receivers include a matching network that is connected to the input of the self-mixer. In some embodiments, the wake-up receivers include a low frequency path connected to the output of the self-mixer. In some embodiments, the wake-up receivers include a high frequency path connected to the output of the self-mixer. In some embodiments, the wake-up receivers are configured to receive an encoded bit stream. In some embodiments, the wake-up receivers are configured to wake-up another receiver.