Bias Sequencing Circuit for Single-Cell PA Switching
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Solution Overview
Problem
Battery-powered FET-based transmission amplifiers require frequent switching off to preserve battery life and need converters to generate dual polarity bias supplies, leading to high on-resistance and reduced power amplifier efficiency, especially when operated with single cell batteries.
Innovation Solution
A low loss, single cell battery-powered bias sequencing and switching circuit that operates at low voltages with low on-resistance, enabling flexible 1 or 0 enable logic and efficient power management, allowing the power amplifier to maintain performance as battery voltage decays from 3.6-4.2V to 2.5V.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If converters are used to generate dual polarity bias supplies from a single battery, then the power amplifier can be powered, but the on-resistance becomes high and power amplifier efficiency is reduced
Solution Approach 1:
The patent extracts the bias generation function from external converters and implements it directly within the power amplifier circuit using a charge pump circuit. This eliminates the need for separate converter components and their associated high on-resistance, thereby improving power amplifier efficiency and reducing power loss.
Solution Approach 2:
The patent introduces a charge pump circuit as an intermediary component that generates the necessary negative bias voltage from the single battery supply. This charge pump acts as a mediator that converts the single polarity battery voltage into dual polarity bias supplies without the high on-resistance characteristics of conventional converters, thus resolving the efficiency problem.
2Adaptability or versatility
If switching circuits operate at higher voltages, then they can provide dual polarity bias supplies, but multiple series batteries are required
Solution Approach 1:
The patent changes the operating voltage parameter of the switching circuit to match the single battery voltage level. By designing the switching circuit to operate at the lower single battery voltage rather than requiring higher voltages, the system can function with a single battery, eliminating the need for multiple series batteries while maintaining the ability to provide dual polarity bias supplies.
3Duration of action of moving object
If FET-based transmission amplifiers are switched off to preserve battery life, then battery life is extended, but the amplifier cannot amplify signals when off
Solution Approach 1:
The patent implements preliminary action by pre-charging capacitors and preparing bias voltages before the amplifier needs to switch into operation. The bias sequencing circuit ensures that when the amplifier is enabled, the necessary voltage conditions are already in place, allowing for rapid transition from off to on state without significant delay, thus maintaining productivity while preserving battery life through efficient switching.
4Weight of moving object
If a single cell battery is used to power the RF device, then the device is compact and service-friendly, but the voltage decays from 3.6-4.2V to 2.5V affecting performance
Solution Approach 1:
The patent implements dynamics by designing the power management circuit to adapt to the changing battery voltage. The bias sequencing and switching circuit dynamically adjusts its operation as the battery voltage decays from 3.6-4.2V down to 2.5V, ensuring that the power amplifier receives appropriate bias voltages throughout the entire battery discharge cycle. This maintains performance consistency despite the varying input voltage, while still benefiting from the compact single-cell battery configuration.
Data Source
AI summary
The present disclosure provide a device, system, and method for generating, in an electrical device, a 1 bit or a 0 bit that is received in a switching circuit powered by a battery. The device, system, and method generates, in the switching circuit, a negative bias voltage and a positive bias voltage. The device, system, and method transmits the negative bias voltage and the positive bias voltage to a power amplifier. The device, system, and method turns the power amplifier from an off-state to an on-state in response to receiving the negative bias voltage. The device, system, and method amplifies, with the power amplifier, a power signal moving through power amplifier when the amplifier is in the on-state.