Doherty Amplifier Decoupling Circuit with Shared Resonance Lead
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Solution Overview
Problem
Conventional RF amplifier packages require multiple extra leads for low frequency resonance decoupling, leading to an undesirably larger form factor due to the use of separate decoupling capacitors for each amplification path.
Innovation Solution
Implement a single extra lead and decoupling capacitor shared between multiple amplification paths within the RF amplifier device to decouple low frequency resonances, reducing the need for multiple leads and minimizing device dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple extra leads and decoupling capacitors are used for each amplification path, then low frequency resonance decoupling effectiveness is improved, but device form factor increases
Solution Approach 1:
The patent combines multiple separate decoupling capacitor circuits into a single shared decoupling capacitor circuit that serves multiple amplification paths simultaneously. This merging approach maintains the necessary low frequency resonance decoupling effectiveness while reducing the overall number of components and leads required, thereby minimizing the device form factor.
Solution Approach 2:
The single decoupling capacitor circuit is designed to perform the decoupling function for multiple amplification paths universally. By making the decoupling circuit multi-functional and shared across different paths, the patent eliminates the need for separate dedicated decoupling capacitors for each path, thus reducing device area while maintaining performance.
2Reliability
If multiple separate decoupling capacitors are used for multiple amplifiers, then decoupling performance is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple separate decoupling capacitor circuits into a single shared circuit that serves multiple amplification paths. This consolidation reduces the total number of components and leads, thereby decreasing device complexity while maintaining effective low frequency resonance decoupling performance across all amplification paths.
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 the dimensions and form factor of RF amplifier devices by utilizing a single extra lead and decoupling capacitor, enhancing design flexibility and performance while maintaining effective low frequency resonance decoupling.
Implementation Method 1
a decoupling capacitor coupled to a reference potential, where the decoupling capacitor is configured to decouple low frequency resonances
Implementation Method 2
the decoupling capacitor is configured to decouple low frequency resonances in a frequency range of 10 MHz to 100 MHz
Data Source
AI summary
An amplifier device, such as a Doherty amplifier device, may include an extra lead and decoupling capacitor coupled to radio frequency (RF) cold points of output impedance matching circuitry of multiple amplification paths, such as a carrier path and peaking path, of the amplifier device. The extra lead and the decoupling capacitor are configured to provide low frequency resonance decoupling for the multiple amplification paths. A drain bias voltage may be provided to the drain terminals of transistors of amplifiers of the amplifier device via the extra lead. An integrated passive device (IPD) including a wire fence and one or more conductive pads may be disposed between a carrier amplifier die and a peaking amplifier. The extra lead may be coupled to the RF cold points via the IPD. The wire fence may mitigate RF interference between the carrier amplifier die and the peaking amplifier die.