Capacitor Driving Circuit for DSB-SC Signal Conversion
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Solution Overview
Problem
Conventional amplifiers, such as class-AB, class-H, or class-D amplifiers, do not produce Double Sideband with Suppressed Carrier (DSB-SC) modulated signals, necessitating a driving circuit that can transform analog output signals into DSB-SC format for various applications.
Innovation Solution
A driving circuit utilizing a capacitor coupled between input terminals and a load, generating a driving signal with alternating polarity portions to produce a generalized DSB-SC modulated component, capable of integrating with any amplifier type and receiving various analog signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional amplifiers (class-AB, class-H, class-D) are used to produce analog output signals, then amplification and power delivery are achieved, but DSB-SC modulated signal generation is not possible
Solution Approach 1:
The patent introduces a capacitor as an intermediary component between the amplifier output and the load. This capacitor, through sampling and transferring operations, mediates the transformation of analog signals into DSB-SC modulated signals, enabling compatibility between conventional amplifiers and DSB-SC requiring loads without modifying the amplifier itself
Solution Approach 2:
The driving circuit is designed to be universal and compatible with multiple amplifier types (class-AB, class-H, class-D) while performing the specific function of generating DSB-SC modulated signals. The circuit uses a capacitor that can operate in different modes (sampling, transferring) to achieve multi-functionality across different application scenarios
2Adaptability or versatility
If a driving circuit is designed to generate DSB-SC modulated signals from analog outputs, then signal modulation capability is achieved, but additional circuit components and complexity are introduced
Solution Approach 1:
The patent extracts the modulation function from the amplifier and implements it separately using a capacitor-based driving circuit. The capacitor is taken out as a discrete component that performs the sampling and transferring operations necessary for DSB-SC modulation, separating the modulation function from the amplification function
Solution Approach 2:
The driving circuit changes the signal parameters by transforming the analog output signal into a DSB-SC modulated signal through controlled charging and discharging of the capacitor. The capacitor voltage transitions between different states (sampling voltage, transferring voltage) to achieve the desired modulation waveform with alternating polarity portions
3Productivity
If analog output signals are directly used to drive loads requiring DSB-SC modulation, then system simplicity is maintained, but modulation efficiency and signal quality are insufficient
Solution Approach 1:
The driving circuit employs periodic sampling and transferring operations on the capacitor to generate the DSB-SC modulated signal. The capacitor is periodically charged during sampling operations and discharged during transferring operations, creating the characteristic alternating polarity waveform required for DSB-SC modulation with high efficiency
Data Source
AI summary
A driving circuit comprises a first capacitor. During a sampling operation, the first capacitor is coupled between a first and a second input terminals. During a transferring operation, an end of the first capacitor receives a voltage and another end of the first capacitor is coupled to a load. The driving circuit produces a first driving signal to drive the load, the first driving signal comprises a plurality of first portions with a first polarity and a plurality of second portions with a second polarity opposite to the first polarity. The plurality of first portions and the plurality of second portions form a generalized DSB-SC modulated component of the first driving signal, which is modulated according to an input signal between the first input terminal and the second input terminal.