Bandgap Reference Circuit Gain Control for Power Noise Reduction
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Solution Overview
Problem
Conventional bandgap reference generating circuits in semiconductor memory devices increase current consumption and power noise due to increased bandwidth, which contradicts the low-power requirements of these devices, especially in self-refresh and low-power modes.
Innovation Solution
A bandgap reference generating circuit with an operational amplifier and a gain controller that adjusts its gain and compensates feedback voltage differently in normal and low-power modes to control current consumption, reducing power noise and optimizing bandwidth for improved power supply rejection ratio (PSRR).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bandwidth of the operational amplifier is increased to improve performance and power supply rejection ratio (PSRR), then the PSRR is improved, but the current consumption of the operational amplifier increases
Solution Approach 1:
The patent applies dynamics by making the bandwidth of the operational amplifier adjustable rather than fixed. The gain controller dynamically changes the bandwidth according to operating conditions - using higher bandwidth during normal operation for improved PSRR, and reducing bandwidth during low-power modes to minimize current consumption. This resolves the contradiction by allowing the system to optimize between PSRR and power consumption based on real-time operational requirements.
Solution Approach 2:
The patent changes the bandwidth parameter of the operational amplifier based on operating modes. By controlling the gain and bandwidth parameters dynamically - increasing them during normal mode for better performance and PSRR, and decreasing them during low-power mode to reduce current consumption - the system resolves the technical contradiction between maintaining high PSRR and minimizing power usage.
2Reliability
If the bandwidth is increased to improve performance of the amp, then the power supply rejection ratio (PSRR) is improved, but the current consumption of the amp increases
Solution Approach 1:
The patent makes the amplifier's bandwidth dynamic rather than static. During normal operation, the amplifier operates with higher bandwidth to achieve better performance and PSRR. During low-power modes such as self-refresh, the bandwidth is reduced to minimize current consumption. This dynamic adjustment resolves the contradiction between maintaining high performance and reducing power usage in different operational contexts.
Solution Approach 2:
The patent changes the operational parameters (bandwidth and gain) of the amplifier based on operational mode. By implementing a gain controller that adjusts these parameters - higher values during normal mode for optimal performance, lower values during low-power mode for reduced current consumption - the system effectively resolves the technical contradiction between performance and power consumption.
3Use of energy by moving object
If the current consumption is reduced in low-power modes, then the power requirement is satisfied, but the bandwidth and performance of the operational amplifier are degraded
Solution Approach 1:
The patent implements dynamic bandwidth adjustment where the operational amplifier operates with reduced bandwidth during low-power modes to minimize current consumption, and switches to higher bandwidth during normal operation to restore full performance. This dynamic switching resolves the contradiction by allowing the system to temporarily accept reduced bandwidth in exchange for meeting low-power requirements, then recover full bandwidth when power constraints are lifted.
Solution Approach 2:
The patent changes the bandwidth parameter of the operational amplifier based on power mode. During low-power modes, the bandwidth parameter is reduced to achieve lower current consumption. During normal operation, the bandwidth parameter is increased to restore full performance. This parameter switching resolves the technical contradiction between reducing current consumption and maintaining bandwidth.
Data Source
AI summary
A bandgap reference generating circuit includes an operational amplifier configured to generate a bandgap reference voltage; and a gain controller configured to control a gain of the operational amplifier with different values in a normal mode and a low power mode.