Charge Pump PA Power Supply for Multi-Band RF Circuit Simplification
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Solution Overview
Problem
Traditional multi-mode multi-band RF communications devices require complex and costly circuitry to support various wireless communications protocols, leading to increased size, cost, and power consumption due to the need for specific circuitry for each mode and frequency band, which complicates the design and efficiency of RF front-end components.
Innovation Solution
A DC-DC converter with a charge pump based RF PA envelope power supply and bias power supply is introduced, utilizing a charge pump buck converter to provide boosted voltages efficiently, reducing the number of switching elements and allowing for flexible operation modes by sharing switching elements between the PA envelope and bias power supplies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional multi-mode multi-band RF communications devices use separate circuitry for each mode and frequency band, then communication protocol support is comprehensive, but device complexity and cost increase
Solution Approach 1:
The patent implements a universal RF front-end architecture where a single power amplifier and shared circuitry can operate across multiple communication modes (half-duplex, full-duplex) and frequency bands by using mode-selective switches and band-selective filters. This eliminates the need for separate dedicated circuitry for each protocol, reducing overall device complexity while maintaining comprehensive protocol support.
Solution Approach 2:
The patent combines multiple power supply functions into a single integrated power amplifier structure. The envelope power supply and bias power supply are merged into one device, and the same RF front-end circuitry is shared across different communication modes and frequency bands, significantly reducing the total number of components and simplifying the overall system architecture.
2Adaptability or versatility
If separate circuitry is used for each frequency band, then frequency band support is comprehensive, but device size increases
Solution Approach 1:
The patent employs a universal RF front-end design where band-selective filters allow a single power amplifier and associated circuitry to operate across multiple frequency bands (e.g., GSM 850/900, DCS 1800, PCS 1900). The same physical hardware is reused for different bands by selecting appropriate filter paths, dramatically reducing the device area compared to having separate circuitry for each band.
Solution Approach 2:
The patent uses dynamically switchable components including mode-selective switches and band-selective filters that can be reconfigured in real-time to support different frequency bands and communication modes. This dynamic reconfiguration capability allows the system to adapt to different bands without requiring separate static circuitry for each band, minimizing the overall device footprint.
3Adaptability or versatility
If specific circuitry is implemented for each communication mode, then mode compatibility is complete, but power consumption increases
Solution Approach 1:
The patent implements a universal power amplifier structure that can operate in both half-duplex and full-duplex modes as well as multiple frequency bands. By using mode-selective switches to route signals appropriately and band-selective filters to isolate frequency paths, the same hardware performs multiple functions, reducing the total number of active components and thereby lowering overall power consumption compared to having separate dedicated circuitry for each mode.
Solution Approach 2:
The patent merges the power supply functionality into a single integrated structure with shared envelope and bias power supplies. This consolidation reduces the total number of power amplifiers and associated control circuits needed, directly reducing power consumption while maintaining full mode compatibility through intelligent signal routing and filtering.
4Adaptability or versatility
If multiple power supplies are used for RF PA circuitry, then power supply flexibility is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple power supply functions (envelope power supply and bias power supply) into a single integrated power amplifier structure. The envelope power supply provides the main RF output power while the bias power supply provides the DC bias voltage, and both are generated and controlled within one unified device. This merging reduces the number of separate power supply circuits needed, simplifying the overall system while maintaining the flexibility to independently control each power function.
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 solution simplifies and reduces the complexity of RF PA circuitry, enabling efficient power supply for amplification while supporting multiple communication modes and frequency bands, thereby minimizing size, cost, and power consumption.
Implementation Method 1
A DC-DC converter with a charge pump based RF PA envelope power supply and bias power supply is introduced, utilizing a charge pump buck converter to provide boosted voltages efficiently
Data Source
AI summary
The present disclosure relates to a direct current (DC)-DC converter, which includes a charge pump based radio frequency (RF) power amplifier (PA) envelope power supply and a charge pump based PA bias power supply. The DC-DC converter is coupled between RF PA circuitry and a DC power supply, such as a battery. As such, the PA envelope power supply provides an envelope power supply signal to the RF PA circuitry and the PA bias power supply provides a bias power supply signal to the RF PA circuitry. Both the PA envelope power supply and the PA bias power supply receive power via a DC power supply signal from the DC power supply. The PA envelope power supply includes a charge pump buck converter and the PA bias power supply includes a charge pump.