Single-Phase Differential Conversion Circuit for Wide-Range Linearity
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Solution Overview
Problem
Single-phase differential conversion circuits face limitations in improving the linearity of input/output characteristics, particularly when handling analog signals with small amplitudes, where noise susceptibility and signal distortion are significant concerns.
Innovation Solution
The implementation of a single-phase differential conversion circuit comprising a first and second source-grounded amplifier, each with a transconductance amplifier section, a diode load section, and a large-signal distortion compensation circuit, utilizing P-type and N-type MOS transistors respectively, to enhance gain compensation and reduce distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-phase differential conversion circuit is used to handle analog signals with small amplitude, then the signal-to-noise ratio is improved, but the linearity of input/output characteristics deteriorates due to gain drops and distortion
Solution Approach 1:
The circuit is divided into two separate source-grounded amplifiers (first and second) with complementary transistor types. Each amplifier handles specific portions of the signal range, with P-type MOS transistors in the first amplifier and N-type MOS transistors in the second amplifier, allowing each segment to operate in its optimal performance region
Solution Approach 2:
The invention changes the transistor type parameter (P-type vs N-type MOS) between the two amplifiers to exploit their different characteristic curves. This parameter change allows the circuit to maintain consistent gain and linearity across the full input range by switching between amplifiers based on the input signal level
2Productivity
If the input signal amplitude increases, then the output signal range expands, but gain drops and distortion increases due to large-signal effects
Solution Approach 1:
The circuit dynamically switches between the first and second amplifiers based on the input signal amplitude. The switching is automatic and continuous, ensuring that the amplifier with the appropriate characteristics for the current signal level is always active, thereby maintaining gain stability and minimizing distortion across the full dynamic range
Solution Approach 2:
The invention creates a composite amplifier system by combining two different amplifier circuits with complementary transistor types. This composite structure leverages the strengths of both P-type and N-type MOS transistors to achieve performance that neither amplifier could achieve alone, particularly in terms of maintaining linearity across wide signal ranges
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
This configuration significantly improves the linearity of input/output characteristics by compensating for gain drops and reducing distortion across a wide input range, thereby enhancing the signal-to-noise ratio and noise figure performance.
Implementation Method 1
a transconductance amplifier section including a transistor for converting an AC component of input potential to a current
Implementation Method 2
a diode load section including a transistor in a diode connection configured as a first load
Data Source
AI summary
This technology relates to a single-phase differential conversion circuit for improving the linearity of input/output characteristics, a signal processing method for use with the circuit, and a reception apparatus. The single-phase differential conversion circuit includes a first source-grounded amplifier and a second source-grounded amplifier. Each of the amplifiers includes a transconductance amplifier section including a transistor for converting an AC component of input potential to a current, a diode load section including a transistor in a diode connection configured as a first load, and a large-signal distortion compensation circuit configured as a second load connected in parallel with the first load. The transistors of the first source-grounded amplifier are each a P-type MOS transistor, and the transistors of the second source-grounded amplifier are each an N-type MOS transistor. This technology is applied advantageously to a reception apparatus for receiving TV signals, for example.