Differential Amplifier Circuit With Tunable Active Inductor Parameters
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Solution Overview
Problem
Conventional amplifier circuits lack the ability to flexibly adjust gain, equivalent impedance, and bandwidth according to different operation frequencies, as active inductors are unable to provide such adjustments.
Innovation Solution
A differential amplifier circuit incorporating a differential amplifier, first and second active inductors, and a parameter circuit that adjusts low frequency gain, equivalent impedance, and bandwidth through parameters located between the active inductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If active inductors are used to increase impedance at high frequency, then the impedance of the amplifier circuit is improved, but the ability to adjust gain, equivalent impedance, and bandwidth according to different operation frequencies is lost
Solution Approach 1:
The patent introduces a parameter circuit that dynamically adjusts the parameters of the active inductors based on operation frequency. The parameter circuit receives frequency information and generates control signals that modify the gain, equivalent impedance, and bandwidth parameters of the active inductors in real-time, transforming the static active inductor into a dynamically adjustable component that adapts to different frequency requirements
Solution Approach 2:
The patent changes the parameters of the active inductors by introducing a parameter circuit that provides control parameters (such as bias currents or voltages) to the active inductors. These parameter changes enable the active inductors to adjust their impedance, gain, and bandwidth characteristics according to the operation frequency, resolving the contradiction between maintaining high impedance and enabling flexible parameter adjustment
2Device complexity
If conventional amplifier circuits are used, then the circuit structure is simple, but the gain, equivalent impedance, and bandwidth cannot be adjusted according to different operation frequencies
Solution Approach 1:
The patent makes the amplifier circuit universal by enabling it to operate effectively across different frequency ranges. The parameter circuit allows the same amplifier circuit structure to be configured for different operation frequencies by adjusting the parameters of the active inductors, making the circuit adaptable to various application scenarios without requiring complete redesign
Solution Approach 2:
The parameter circuit acts as an intermediary between the frequency requirements and the active inductors. It receives frequency information and translates it into appropriate parameter adjustments for the active inductors, enabling the amplifier circuit to adapt to different operation frequencies while maintaining a relatively simple overall structure
Data Source
AI summary
A differential amplifier circuit is provided. The differential amplifier circuit includes a differential amplifier, a first active inductor, a second active inductor, and a parameter circuit. The differential amplifier includes a first differential output terminal and a second differential output terminal. The first active inductor is coupled to the first differential output terminal. The second active inductor is coupled to the second differential output terminal. The parameter circuit is coupled between the first active inductor and the second active inductor. The parameter circuit provides at least one parameter. A low frequency gain, an equivalent impedance, and a bandwidth of the differential amplifier circuit are adjusted in response to the at least one parameter.