Digital Isolator Receiver Front End With Adaptive Gain Compensation
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Solution Overview
Problem
Existing isolation channels in communication systems are susceptible to common mode transient events, which interfere with the accuracy of information transmission and vary in power consumption, necessitating a solution that provides reliable communication with selectable power consumption and immunity to such transients.
Innovation Solution
A receiver front-end circuit is configured with a programmable flat gain stage and peaking gain stage to compensate for gain loss in reduced power consumption configurations, using a variable peaking gain stage with programmable flat gain to maintain signal integrity and common-mode transient immunity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the receiver front-end circuit operates in reduced power consumption configuration, then power consumption is reduced, but gain loss occurs in the receiver circuit
Solution Approach 1:
The patent implements a variable peaking gain stage that can dynamically adjust its gain characteristic between a first peaking gain characteristic (for full power mode) and a second peaking gain characteristic (for reduced power mode). This dynamic adaptation allows the receiver to maintain signal integrity across different power consumption configurations, resolving the contradiction between power reduction and gain maintenance.
Solution Approach 2:
The patent changes the peaking gain parameter of the variable peaking gain stage based on the power consumption configuration. When switching from full power mode to reduced power mode, the peaking gain characteristic is adjusted to compensate for the gain loss in the receiver front-end circuit, thereby maintaining overall signal gain while operating at reduced power consumption.
2Device complexity
If the peaking gain stage uses fixed gain characteristic, then circuit design is simplified, but it cannot compensate for gain loss in different power consumption configurations
Solution Approach 1:
The variable peaking gain stage is designed to switch between different peaking gain characteristics based on the operating power mode. This dynamic capability enables the circuit to adapt to different power consumption configurations while maintaining signal integrity, providing both full power mode and reduced power mode optimization without requiring completely separate circuit designs.
3Reliability
If the receiver front-end circuit is designed for full power mode, then signal gain is maximized, but power consumption increases
Solution Approach 1:
The receiver front-end circuit incorporates a variable peaking gain stage that dynamically adjusts its characteristics based on the selected power consumption configuration. In full power mode, the circuit operates with maximum gain characteristics; in reduced power mode, the peaking gain characteristic changes to compensate for the reduced front-end gain, thereby maintaining acceptable signal gain while reducing power consumption.
Solution Approach 2:
The patent implements parameter changes in the peaking gain stage to match different power consumption configurations. By adjusting the peaking gain parameter according to the operating mode, the system can operate efficiently at reduced power consumption while maintaining the necessary signal gain through the variable gain compensation mechanism.
Data Source
AI summary
In at least one embodiment, a method for operating a receiver includes configuring a receiver front-end circuit of the receiver according to a selected power consumption configuration. The method includes adjusting a quiescent current of a programmable flat gain stage coupled to the receiver front-end circuit according to the selected power consumption configuration to compensate for any gain loss of the receiver front-end circuit in the selected power consumption configuration. The selected power consumption configuration may be a reduced power consumption configuration and the programmable flat gain stage may be configured to at least partially compensate for the gain loss of the receiver front-end circuit in the reduced power consumption configuration.