Differential IMD Receiver for Polarity-Independent Signal Detection
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Solution Overview
Problem
Existing implantable medical devices (IMDs) face challenges in effectively communicating with each other due to limitations in single-ended receivers, including sensitivity dependence on signal polarity, noise immunity, electrode connection requirements, and complexity, especially in multi-electrode systems like S-ICDs.
Innovation Solution
A fully-differential receiver with a differential pair of inputs and outputs, comprising a preamplifier, buffer, AC coupling network, and comparators, operates in two modes to enhance signal reception and reduce noise interference, supporting multi-electrode systems and reducing power supply complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-ended receiver is used to receive conducted communication signals, then the device complexity is reduced, but the signal reception becomes dependent on signal polarity and noise immunity deteriorates
Solution Approach 1:
The receiver is divided into two independent single-ended receivers, each dedicated to detecting one polarity (positive or negative). This segmentation allows each receiver to be optimized for its specific polarity detection task, improving overall reliability without requiring a complex fully-differential receiver architecture.
Solution Approach 2:
Instead of using a single receiver that must handle both polarities, the invention inverts the approach by using two specialized receivers, each handling one polarity. This inversion of the traditional single-receiver architecture resolves the contradiction by making polarity independence achievable through parallel specialized detection paths.
2Adaptability or versatility
If a fully-differential receiver is used to achieve polarity independence, then signal reception independence from polarity is improved, but device complexity increases
Solution Approach 1:
The fully-differential receiver architecture is segmented into two independent single-ended receivers, each handling one polarity. This segmentation achieves polarity independence while avoiding the complexity of a true fully-differential design by distributing the functionality across two simpler, specialized receivers.
Solution Approach 2:
The dual-receiver system provides universal polarity detection capability, where each receiver is universally capable of detecting its designated polarity reliably. This multi-functionality approach allows the system to handle both positive and negative polarities effectively without requiring a single complex receiver to perform all functions.
3Object-affected harmful factors
If a fully-differential receiver is implemented, then noise immunity is enhanced, but power supply requirements and complexity increase
Solution Approach 1:
The noise immunity function is segmented and distributed across two single-ended receivers rather than concentrated in one fully-differential receiver. Each receiver handles noise filtering for its specific polarity, achieving effective noise immunity while maintaining simpler individual receiver designs that reduce overall system complexity.
4Adaptability or versatility
If single-ended receivers are used with multi-electrode systems, then electrode connection flexibility is improved, but signal polarity dependence and noise immunity worsen
Solution Approach 1:
The signal reception function is segmented into two polarity-specific single-ended receivers, allowing flexible electrode connections for each polarity type. This segmentation enables the system to adapt to different electrode configurations while maintaining reliable signal detection for both positive and negative polarities through specialized detection paths.
Solution Approach 2:
The invention inverts the traditional approach by not trying to make a single receiver handle all electrode configurations and polarities. Instead, it uses two specialized receivers that can be independently configured for different electrode connections, achieving both flexibility and reliability through this inverted architectural approach.
Data Source
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AI summary
Described herein is a fully-differential receiver (102) for use with an implantable medical device (IMD) (402) and configured to receive conducted communication signals that are transmitted by another IMD or an external device. The fully-differential receiver (102) includes a fully-differential preamplifier (112), a fully-differential buffer (122), a first comparator (142), a second comparator (152), and an AC coupling network (132) coupled between differential outputs of the fully-differential buffer (122) and a coupled together differential pair of inputs of the first and second comparators (142, 152). A differential pair of inputs of the fully-differential receiver (102) comprise the differential pair of inputs of the fully-differential preamplifier (112), and a differential pair of outputs of the fully-differential receiver (102) comprise a first output of the first comparator (142) and a second output of the second comparator (152). In order to conserve power, the fully-differential receiver (102) is selectively changed from operating in a first mode to operating in a second mode, and vice versa.