Single-Ended Amplifier Topology With Passive Differential Output
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Solution Overview
Problem
Existing amplifiers with single-ended input and differential output face challenges in achieving low power consumption, low noise, and smaller implementation area, as they often require additional active components and auxiliary paths that increase power consumption and noise figure.
Innovation Solution
The use of a set of passive impedances, including a three-terminal centre-tapped inductor and capacitors, which provide a 180 degrees phase-shifted signal to form a differential amplified output, reducing the need for auxiliary active elements and minimizing power consumption and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If additional active components and auxiliary paths are used to achieve single-ended input and differential output, then the amplifier can provide differential output signal, but power consumption increases
Solution Approach 1:
The patent extracts and eliminates the need for auxiliary active elements and auxiliary paths from the amplifier design. By using a single-ended input amplifier topology without requiring additional active components or auxiliary signal paths, the invention reduces power consumption while maintaining differential output capability.
Solution Approach 2:
The patent uses a passive impedance copying approach where the output impedance is copied to both differential outputs through passive components. This allows differential output to be achieved without requiring additional active elements that would consume power, as the impedance transformation is done passively rather than through active amplification.
2Area of stationary object
If additional active components and auxiliary paths are used to achieve single-ended input and differential output, then the amplifier can provide differential output signal, but implementation area increases
Solution Approach 1:
The patent removes auxiliary active elements and auxiliary paths from the amplifier design, thereby reducing the implementation area. The differential output is achieved through the main signal path using passive impedance transformation rather than requiring additional active components that would occupy extra space.
Solution Approach 2:
The patent merges the functions of differential output generation into the main amplifier path using passive components. By combining the impedance transformation and differential signal generation into a single integrated approach without separate auxiliary paths, the implementation area is minimized.
3Object-affected harmful factors
If additional active components and auxiliary paths are used to achieve single-ended input and differential output, then the amplifier can provide differential output signal, but noise figure increases
Solution Approach 1:
The patent extracts and eliminates auxiliary active elements that contribute to noise figure degradation. By avoiding the use of additional active components and auxiliary paths, the invention prevents the introduction of additional noise sources, thereby maintaining a lower noise figure.
Solution Approach 2:
The patent replaces complex active auxiliary elements with simple passive components. Passive components such as resistors, capacitors, and inductors introduce minimal noise compared to active elements, effectively using simpler, lower-noise components to achieve the same functional goal.
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 approach results in an amplifier with lower power consumption, reduced noise figure, and smaller implementation area, while effectively rejecting common-mode noise, thus meeting the requirements of low noise and smaller size.
Implementation Method 1
a set of passive impedances forming a tuned load to a gain stage and also to provide a 180 degrees phase shifted signal of a gain signal received from the gain stage
Implementation Method 2
a set of passive impedances forming a tuned load to the gain stage
Implementation Method 3
The output of the gain stage and the 180 degrees phase shifted signal together form a differential amplified signal
Implementation Method 4
The windings of the inductor may be designed to provide mutual coupling between two portions such that there is a negative correlation between the strength of the received gained signal and the 180 degree phase shifted signal
Data Source
AI summary
An amplifier provided according to an aspect of the present invention includes a set of passive impedances forming a tuned load to a gain stage and also to provide a 180 degrees phase shifted signal of a gain signal received from the gain stage. The output of the gain stage and the 180 degrees phase shifted signal together form a differential amplified signal corresponding to an input signal gained by the gain stage. In an embodiment, the set of passive impedances includes a three terminal centre tapped inductor in combination with a capacitor, together operating as a filter to pass only a desired frequency band. The windings of the inductor may be designed to provide mutual coupling between two portions such that there is a negative correlation between the strength of the received gained signal and the 180 degree phase shifted signal.