Single-Supply Signal Circuit for Near-Zero Wideband Output
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Solution Overview
Problem
Existing single-supply apparatuses for signal transmission struggle to achieve near-zero output voltage and high growth rate of signals, leading to signal distortion, particularly in wideband signal transmission.
Innovation Solution
A single-supply apparatus comprising two operational amplifiers, two transistors, and a resistor with a feedback circuit and output current setter, which stabilizes current to produce minimal output voltage and eliminate nonlinear distortions, allowing for undistorted transmission of wideband signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pedestal is added to output voltage to offset it closer to zero, then the output voltage approaches zero, but the pedestal level must be accurately controlled which increases device complexity
Solution Approach 1:
The circuit uses the transmitted signal itself to control the pedestal voltage through the voltage-controlled amplifier, eliminating the need for external accurate pedestal control mechanisms. The signal automatically modulates the pedestal level, achieving self-regulation.
Solution Approach 2:
The invention changes the control parameter from fixed pedestal voltage to signal-dependent pedestal voltage. The pedestal voltage becomes a function of the transmitted signal amplitude, allowing dynamic adjustment without complex external control circuits.
2Use of energy by moving object
If supply voltage is diminished to lower power consumption, then power consumption decreases, but the minimal non-distorted output voltage increases which reduces dynamic range
Solution Approach 1:
The invention changes the relationship between supply voltage and output voltage by introducing signal-dependent control. The VCA allows the output voltage to be precisely controlled based on the input signal, enabling near-zero output even with low supply voltage, thus maintaining dynamic range while reducing power consumption.
Solution Approach 2:
The circuit employs feedback mechanisms where the output signal influences the pedestal voltage through the VCA control, creating a self-regulating system that maintains signal integrity across the dynamic range despite reduced supply voltage.
3Measurement precision
If output voltage is lowered to near-zero to transmit small signals, then small signal transmission is enabled, but nonlinear distortions increase
Solution Approach 1:
The voltage-controlled amplifier acts as an intermediary between the fixed pedestal voltage source and the output, dynamically adjusting the pedestal level to maintain linear operation. This intermediary control prevents nonlinear distortions while enabling near-zero output voltages.
Solution Approach 2:
The invention transforms the static pedestal voltage into a dynamic, signal-dependent voltage. The pedestal automatically adjusts its level according to the instantaneous signal amplitude, maintaining optimal operating conditions and minimizing distortions throughout the signal cycle.
4Object-generated harmful factors
If feedback circuit is added to reduce distortions, then signal fidelity improves, but device complexity increases
Solution Approach 1:
The voltage-controlled amplifier serves multiple functions simultaneously: it provides signal amplification, dynamic pedestal control, and feedback regulation. This multi-functionality reduces the need for separate feedback circuitry, maintaining signal fidelity without proportionally increasing complexity.
Data Source
AI summary
A single-supply apparatus for signal transmission comprises two operational amplifiers (OA), two transistors, a resistor, a feedback circuit (FC), and a current setter. An output of the first OA is connected to a first electrode of the first transistor, a first input of the first OA is connected to a terminal for receiving an input signal. The second transistor, second OA, and resistor form a current stabilizer (CS). A junction point of the CS input, a third electrode of the first transistor, and a FC first terminal is reserved for connecting a load. A second terminal of the FC is connected to a second input of the first OA. When made as an IC, the apparatus can have the FC and current setter outside elements. Using single-supply operation, the invention ensures widening the dynamic range of the transmitted signals and high growth rate of the output signal.