Wireless PA Interface With Duty Cycle Correction Across Ground Domains
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Solution Overview
Problem
Integrated circuits (ICs) face interference issues due to ground bounce during wireless communications, leading to duty cycle variations and harmonic emissions, which current solutions fail to adequately address, especially in terms of power amplifier stability and cost-effectiveness.
Innovation Solution
The implementation of a circuit architecture that includes a transmit circuit for upconverting baseband signals, a duty cycle correction circuit to compensate for duty cycle variations, a conversion circuit to convert between single-ended and differential RF signals, and an interface circuit to transfer signals across different ground domains, reducing the need for external filtering and improving power amplifier stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If extensive off-chip filtering circuitry is provided to meet performance requirements, then harmonic and spurious emissions are reduced, but real estate, power consumption, and cost increase
Solution Approach 1:
The patent extracts the filtering function from external off-chip components and integrates it into the on-chip power amplifier circuit through feedback mechanisms. The feedback network captures harmful emissions and feeds them back to the power amplifier input to cancel them out, eliminating the need for extensive external filtering circuitry while reducing power consumption and device area.
Solution Approach 2:
The patent introduces a feedback network as an intermediary element that mediates between the power amplifier output and input. This feedback network processes the output signal and feeds corrected information back to the input, enabling on-chip harmonic and spurious emission cancellation without requiring external filtering components.
2Object-generated harmful factors
If extensive off-chip filtering circuitry is provided to meet performance requirements, then harmonic and spurious emissions are reduced, but device area and cost increase
Solution Approach 1:
The patent extracts the filtering function from external off-chip components and integrates it into the on-chip power amplifier circuit through feedback mechanisms. The feedback network captures harmful emissions and feeds them back to the power amplifier input to cancel them out, eliminating the need for extensive external filtering circuitry while reducing power consumption and device area.
Solution Approach 2:
The patent merges the filtering function with the power amplifier circuit by integrating the feedback network on the same chip. This consolidation combines signal amplification and harmonic cancellation into a single integrated system, eliminating the need for separate external filtering components and reducing overall device complexity and cost.
3Object-generated harmful factors
If ground domains are separated to reduce interference, then ground bounce is reduced, but power amplifier stability is adversely impacted due to inherent feedback through different ground domains
Solution Approach 1:
The patent introduces a feedback network as an intermediary element that mediates between the power amplifier output and input. This feedback network processes the output signal and feeds corrected information back to the input, enabling on-chip harmonic and spurious emission cancellation without requiring external filtering components.
Solution Approach 2:
The patent employs feedback mechanisms where the output signal is sampled and fed back to the input through a feedback network. This feedback is used to cancel harmonics and spurious emissions by injecting corrected signals that counteract the harmful emissions, thereby maintaining power amplifier stability while reducing ground bounce effects.
Data Source
AI summary
In an embodiment, an apparatus includes: a transmit circuit to upconvert a baseband signal to a first differential radio frequency (RF) signal, the transmit circuit to convert the first differential RF signal to a first single-ended RF signal; a duty cycle correction circuit coupled to the transmit circuit to receive the first single-ended RF signal and compensate for a duty cycle variation in the first single-ended RF signal to output a duty cycle-corrected RF signal; a conversion circuit to convert the duty cycle-corrected RF signal to a second differential RF signal; and an interface circuit to transfer the second differential RF signal from a first ground domain to a second ground domain.