Sigma Delta Modulator Loop Filter Reconfiguration
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Solution Overview
Problem
Existing sigma delta modulators are limited to operating in a single signal bandwidth and clock frequency due to design complexity and stability issues, leading to increased system size and power consumption when multiple modes are required.
Innovation Solution
A sigma delta modulation device that switches the order of its loop filter to support multiple modes, while compensating for notch frequencies in the noise transfer function, using a processor-controlled circuit with operational amplifiers, capacitors, resistors, and switches to adjust signal transfer characteristics and resistor values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the order of loop filter is switched to support multiple modes, then adaptability is improved, but device complexity increases
Solution Approach 1:
The loop filter is designed with dynamic reconfiguration capability, allowing the order to be switched between third-order and second-order modes through control signals. This enables the filter to adapt its structure dynamically based on operating conditions, resolving the contradiction between adaptability and complexity by making the complexity conditional rather than fixed.
Solution Approach 2:
A single loop filter circuit is designed to perform multiple functions by supporting both third-order and second-order transfer functions. The same physical components (op-amps, capacitors, resistors) can be configured to implement different filter orders, eliminating the need for separate filters for different modes and reducing overall system complexity.
2Reliability
If resistor values are adjusted to compensate for notch frequency, then noise transfer function performance is improved, but device complexity increases
Solution Approach 1:
The patent employs parameter changes by adjusting resistor values to compensate for notch frequency shifts that occur during loop filter order switching. By modifying the resistance parameters in the loop filter circuit, the noise transfer function's notch frequency is restored to its optimal position, maintaining signal quality across different operating modes without requiring additional compensation circuits.
3Device complexity
If a single loop filter structure is used for multiple modes, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent addresses manufacturing precision requirements by carefully selecting and matching component values (resistors and capacitors) during the design phase. By optimizing the nominal values and tolerances of these components, the loop filter can maintain accurate transfer function characteristics across both third-order and second-order configurations, reducing the burden on manufacturing precision while keeping the structure simple and unified.
Data Source
AI summary
There is provided an adversarial self-supervised learning method for a sigma delta modulation device. The device comprises a loop filter including an operational amplifier, and a circuit including a plurality of capacitors, a plurality of resistors, and a plurality of switches, which are connected to the operational amplifier; a quantization part quantizing and outputting a signal that is output from the loop filter; a feed-back converter converting a digital signal output from the quantization part into an analog signal; a memory configured to store one or more instructions; and a processor configured to control turn on or off of the plurality of switches, and adjust resistor values in an equivalent circuit of the loop filter in order to compensate a notch frequency reduced in the loop filter for satisfying a second-order transfer function.