Bias Circuit Duty Cycle Power Optimization
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Solution Overview
Problem
Integrated circuits face challenges in efficiently generating bias signals with minimal power consumption and effective control, particularly as operating requirements vary, leading to difficulties in managing bias currents and voltages.
Innovation Solution
A bias circuit apparatus that includes a ready circuit to indicate sufficient supply voltage, a voltage regulator to control regulated voltage based on bias currents, and an output circuit to generate bias outputs using bandgap and constant-transconductance currents, operating in a duty cycle mode to optimize power consumption and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If internal bias generator circuits are used to generate bias signals, then bias signals can be provided at appropriate levels, but power consumption increases and control becomes difficult
Solution Approach 1:
The bias generator circuit operates in periodic duty cycle mode, alternating between active and sleep states. During the active state, the circuit generates accurate bias signals; during the sleep state, it consumes minimal power. This periodic operation allows the system to achieve both accurate bias signal generation and reduced power consumption by keeping the circuit inactive for portions of the operating cycle.
2Measurement precision
If internal bias generator circuits are used to generate bias signals, then bias signals can be provided at appropriate levels, but control becomes difficult as operating requirements vary
Solution Approach 1:
The bias generator circuit incorporates dynamic control capabilities that allow it to adapt its operation based on varying operating requirements. The circuit can adjust its duty cycle, switch between different operating modes, and respond to control signals that modify its behavior according to the specific needs of the integrated circuit, thereby improving ease of operation while maintaining bias signal accuracy.
3Use of energy by moving object
If duty cycle mode is used to reduce power consumption, then power efficiency improves, but continuous bias signal availability may be affected
Solution Approach 1:
The bias generator circuit maintains continuous bias signal availability despite operating in duty cycle mode by using charge storage devices that retain the generated bias signals during the sleep state. This allows the circuit to provide uninterrupted bias signals to the integrated circuit while still achieving power consumption reduction during the inactive portions of the duty cycle.
Data Source
AI summary
In one aspect, an apparatus includes a ready circuit to output a ready indicator when a supply voltage provided to the ready circuit and a voltage regulator is sufficient to operate the voltage regulator. In turn, the voltage regulator is to receive the supply voltage and output a regulated voltage, receive a first current from the ready circuit and control the regulated voltage based on the first current when the ready indicator is inactive. The apparatus further includes a bias circuit to receive the regulated voltage and generate one or more bias currents, which may be provided to an output circuit to output one or more bias outputs to one or more client circuits therefrom.