Tunable Wideband Driver Amplifier With Band Switching and Harmonic Traps
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Solution Overview
Problem
Conventional driver amplifiers in wireless devices require multiple amplifiers for different frequency bands, leading to increased die area and transmitter complexity, which is costly and complex to manage.
Innovation Solution
A tunable wideband driver amplifier that uses a single amplifier configuration with band-selectable frequency ranges (800MHz to 2.4GHz) and harmonic reduction circuits, allowing for reduced die area and simplified design by enabling selection between low and high frequency bands with programmable capacitors and inductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple driver amplifiers are used for different frequency bands, then the desired amplification goals are achieved, but the die area requirements increase
Solution Approach 1:
The patent implements a single driver amplifier that can operate across multiple frequency bands (low band and high band) by making the amplifier itself tunable. This universal amplifier replaces multiple dedicated amplifiers, achieving the same amplification performance for different bands while significantly reducing the die area required in the transmitter chip.
Solution Approach 2:
The patent changes the operating parameters of the amplifier by tuning its characteristic impedance and resonant frequency to match different frequency bands. By adjusting these parameters, the same amplifier hardware can effectively amplify signals in both low and high frequency bands, eliminating the need for multiple fixed-frequency amplifiers.
2Reliability
If multiple driver amplifiers are used for different frequency bands, then the amplification goals are met, but the transmitter complexity increases
Solution Approach 1:
The tunable driver amplifier serves multiple frequency bands with a single unified circuit design, eliminating the need for multiple separate amplifier paths and their associated control circuits. This reduces the overall transmitter architecture from a multi-path complex system to a single-path tunable system.
Solution Approach 2:
The patent merges the functionality of multiple frequency-specific amplifiers into a single combined amplifier unit. By integrating the low-band and high-band amplification capabilities into one tunable device, the transmitter structure is simplified, reducing the number of components and interconnections required.
3Area of stationary object
If a single wideband amplifier is used, then the die area is reduced, but the ability to suppress harmonics across different bands becomes challenging
Solution Approach 1:
The patent employs dynamic tuning of the amplifier's characteristic impedance and resonant frequency to adapt to different operating bands. This dynamic adjustment allows the amplifier to maintain optimal performance and harmonic suppression characteristics for both low and high frequency bands, something that would be difficult to achieve with a fixed-frequency design.
Solution Approach 2:
By changing the amplifier's operating parameters (impedance, resonant frequency) to match the desired frequency band, the system can effectively suppress harmonics specific to each band. The tunable design allows the amplifier to present appropriate impedance characteristics that minimize harmonic generation and improve overall spectral efficiency.
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
The solution reduces die area by half compared to conventional configurations, simplifies transmitter design, and effectively amplifies signals across a wide frequency range while attenuating harmonics, thereby reducing complexity and cost.
Implementation Method 1
a tank circuit, selectively connected between a source terminal of the transistor and a circuit ground, operates to adjust the amplification band of the amplifier
Implementation Method 2
a trap circuit, selectively connected between a drain terminal of the transistor and the circuit ground, operates to reduce or attenuate frequencies at and above a second harmonic of the center frequency of the selected band
Data Source
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AI summary
A tunable wide band driver amplifier is disclosed. In an exemplary embodiment, an apparatus includes a first band selection circuit selectively connected between an output terminal of an amplifier and a circuit ground. The first band selection circuit configured to adjust an amplification band from a first frequency band to a second frequency band. The apparatus also includes a first harmonic reduction circuit selectively connected between the first band selection circuit and the circuit ground and configured to reduce 2nd harmonic frequencies associated with the first frequency band when the amplification band is set to the first frequency band.