RF Transmitter Current Mode Control for Lower PA Power Use
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Solution Overview
Problem
Existing RF transmitters consume unnecessary power due to fixed configurations that meet the most critical TX conditions, leading to inefficiency in relaxed conditions.
Innovation Solution
A transmitter architecture that dynamically sets current modes based on instantaneous TX information, including RB information, MCS, and OFDM type, controlling supply and bias voltages of the PA to optimize power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed configuration is applied to all TX conditions to meet the most critical case, then the signal quality and performance specifications (e.g., ACLR) are ensured, but unnecessary power consumption is introduced in relaxed TX conditions
Solution Approach 1:
The transmitter dynamically adjusts its configuration by selecting from multiple candidate current modes based on instantaneous TX conditions. The DSP circuit determines the appropriate current mode by evaluating parameters such as resource block information, modulation and coding scheme, and OFDM type, then controls the PA's supply voltage and bias voltage accordingly. This dynamic adaptation allows the system to maintain signal quality when needed while reducing power consumption in relaxed conditions.
2Use of energy by moving object
If multiple candidate current modes are implemented with dynamic selection, then power efficiency is optimized in various TX conditions, but device complexity increases
Solution Approach 1:
The system implements multiple candidate current modes that correspond to different target power consumptions. The DSP circuit changes operational parameters (supply voltage and bias voltage of the PA) based on the selected current mode, which is determined by instantaneous TX conditions including resource block information, modulation and coding scheme, and OFDM type. This parameter-based approach enables power efficiency optimization while managing complexity through systematic control.
Data Source
AI summary
A transmitter and a method for dynamically setting a current mode of the transmitter are provided. The transmitter includes a digital signal processing (DSP) circuit and a radio frequency (RF) circuit. The DSP circuit is configured to determine a target current mode by selecting one of multiple candidate current modes of the transmitter according to instantaneous transmitting (TX) information, wherein the instantaneous TX information includes at least one of a resource block (RB) information, a modulation and coding scheme (MCS), and an orthogonal frequency-division multiplexing (OFDM) type of an instantaneous TX signal. The RF circuit is configured to output the instantaneous TX signal, wherein at least one supply voltage and at least one bias voltage of a power amplifier (PA) of the RF circuit is controlled according to the target current mode. More particularly, the multiple candidate current modes correspond to different target power consumptions of the transmitter, respectively.