Jack Detection Circuit With Linearized ADC Input Signals
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Solution Overview
Problem
Conventional jack detection circuits generate non-linear input signals for AD converters, requiring higher bit rate converters and increasing complexity in signal recognition.
Innovation Solution
A jack detection circuit comprising a switching circuit, a transition circuit, and an AD converter that generates a digital signal by forming an equivalent resistance based on the jack or key state, using a transition circuit to produce a reference current from a first reference voltage and the equivalent resistance, and converting it into a digital signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional switching circuit is used to generate input signals for the AD converter, then the jack or key state can be detected, but the input signal varies non-linearly requiring higher bit rate AD converters and increasing device complexity
Solution Approach 1:
The patent introduces a transition circuit as an intermediary component between the switching circuit and the AD converter. This transition circuit converts the non-linear voltage signal from the switching circuit into a linear current signal that is proportional to the equivalent resistance. The linear current signal then feeds into the AD converter, eliminating the need for high bit rate converters and simplifying signal recognition while maintaining detection accuracy
Solution Approach 2:
The patent changes the parameter type from voltage (non-linear relationship with resistance) to current (linear relationship with resistance). By using a transition circuit that generates current proportional to the equivalent resistance rather than using voltage division, the system achieves linear signal variation that simplifies the AD converter requirements and reduces overall device complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides linearly varied input signals for AD converters, simplifying signal recognition and reducing complexity by maintaining a consistent bit rate.
Implementation Method 1
The switching circuit forms an equivalent resistance in accordance with the jack or key state of the analog device or its analog signal
Implementation Method 2
The transition circuit is coupled to the switching circuit and generates a reference current in accordance with a first reference voltage and the equivalent resistance
Data Source
AI summary
A jack detection circuit includes a transition circuit and an AD converter. The transition circuit linearizes analog signals sent from a switching circuit. The AD converter converts the linearized analog signals to digital output signals thereby decreasing the complexity of signal recognition.