Analog Multiplier Using Frequency Modulation and Switching
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Solution Overview
Problem
Existing analog multipliers face challenges in precision and complexity due to the need for components to operate in saturated or sub-threshold regions, and the requirement for A/D and D/A converters complicates their implementation.
Innovation Solution
An analog multiplier design that converts input signals into frequency modulation signals using energy storage units and switch units, allowing for the calculation of product signals without the need for A/D and D/A converters, thereby simplifying the structure and improving precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the multiplier is constructed based on the Shichman-Hodges model to achieve precision, then measurement precision is improved, but device complexity increases due to stricter matching requirements between components
Solution Approach 1:
The patent changes the operating parameters by using a first-level dynamic model instead of the static Shichman-Hodges model, allowing transistors to operate in linear region rather than saturated or sub-threshold regions. This parameter change relaxes matching requirements while maintaining calculation accuracy through dynamic operation characteristics
Solution Approach 2:
The patent replaces the traditional static circuit model (Shichman-Hodges) with a dynamic model approach, substituting the mechanical/static matching requirements with dynamic operation that inherently provides signal isolation and reduces sensitivity to component variations
2Adaptability or versatility
If A/D and D/A converters are added to implement multiplier functionality, then adaptability is improved, but device complexity increases making the system hard to implement
Solution Approach 1:
The patent extracts and removes the A/D and D/A converter components from the system by implementing the multiplier function directly in the analog domain using dynamic transistor operation, thereby eliminating the need for conversion stages while maintaining computational capability
Solution Approach 2:
The patent makes the transistor circuit universally capable of performing multiplication directly without requiring separate conversion components, allowing the same circuit to handle both signal processing and mathematical operations in the analog domain
Data Source
AI summary
The analog multiplier includes a first signal input module, and a second signal input module or a third signal input module. The first signal input module is configured to output a frequency modulation signal. The second signal input module includes a first energy storage unit, a first switch unit, and a second switch unit. The first switch unit and the second switch unit are alternately turned on or turned off based on a frequency of the frequency modulation signal. The third signal input module includes a second energy storage unit, two third switch units, and two fourth switch units. The third switch unit and the fourth switch unit are alternately turned on or turned off based on the frequency of the frequency modulation signal.