SIMO Low-Noise Amplifier Bandwidth Tuning for Wide-Band Matching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing RF circuit designs face challenges in providing impedance matching for wide-band outputs without significant insertion loss, noise, or increased design area requirements, especially when trying to output signals at multiple wide-band frequencies.
Innovation Solution
The RF circuit incorporates a low-noise amplifier (LNA) sub-circuit and a wide-band matching sub-circuit, utilizing shunt and series inductors for impedance transformation and matching, along with magnetically-isolated LC circuits for selective wide-band output, thereby reducing noise and design area while improving gain and matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple inductors with shunt or series movements are used for impedance matching, then impedance matching capability is improved, but chip area increases and insertion loss increases
Solution Approach 1:
The patent combines multiple inductor functions into a single inductor structure. The first inductor serves dual purposes: it provides impedance transformation through its inherent inductance while also serving as part of the impedance matching network. This merging of functions reduces the total number of inductor components needed, thereby reducing chip area while maintaining impedance matching capability.
Solution Approach 2:
The single inductor in the circuit performs multiple functions simultaneously: it acts as an impedance transforming element, a matching element, and part of the resonant circuit. This multi-functionality eliminates the need for separate inductors for each purpose, reducing overall component count and chip area occupation.
2Reliability
If multiple inductors with shunt or series movements are used for impedance matching, then impedance matching capability is improved, but insertion loss increases
Solution Approach 1:
By merging the impedance transformation and matching functions into a single inductor, the patent reduces the total number of inductor connections and associated parasitic resistances. Fewer connections and components mean reduced cumulative insertion loss while maintaining the necessary impedance matching performance.
3Area of stationary object
If port combining is used for signal reception and transmission, then design area is reduced, but frequency bandwidth is limited to narrow-band
Solution Approach 1:
The patent employs switchable capacitor structures that can dynamically change the resonant frequency of the circuit. By switching between different capacitor values, the circuit can adapt to different frequency bands while maintaining the compact port-combined architecture. This dynamic reconfigurability enables wide-band operation without sacrificing area efficiency.
Solution Approach 2:
The circuit uses switchable capacitors to change the electrical parameters of the resonant circuit, allowing it to operate across wide frequency bands. The capacitor switching mechanism adjusts the resonant frequency dynamically, enabling the compact port-combined design to achieve wide-band performance rather than being limited to narrow-band operation.
4Adaptability or versatility
If switchable inductor structures are used for wide-band signal output, then frequency band versatility is improved, but gain is compromised
Solution Approach 1:
The patent merges the impedance transformation function with the signal amplification function in a unified circuit architecture. The single inductor works in conjunction with the amplifier to provide both impedance matching and signal gain, avoiding the gain loss that occurs when separate switchable inductor structures are used for frequency band switching.
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 enables efficient impedance matching and wide-band output with reduced noise and insertion loss, allowing for flexible design and improved performance across multiple wide-band frequencies.
Implementation Method 1
utilizing shunt and series inductors for impedance transformation and matching
Implementation Method 2
magnetically-isolated LC circuits for selective wide-band output
Data Source
AI summary
Embodiments disclosed herein relate to impedance matching for outputting wide-band signals in radio frequency applications. In an example, a circuit including a low-noise amplifier (LNA) sub-circuit and a tuning sub-circuit is provided. The LNA sub-circuit is configured to couple to an antenna and includes a transistor that includes a gate, a source, and a drain, a first inductor that includes a first terminal configured to couple to the antenna and includes a second terminal, a second inductor that includes a first terminal coupled to the first terminal of the first inductor and includes a second terminal coupled to the gate of the transistor, and a third inductor that includes a first terminal coupled to the source of the transistor and includes a second terminal. The tuning sub-circuit is coupled to the source of the transistor.