Active Bandpass Clamp Voltage Correction Circuit
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Solution Overview
Problem
Conventional switching voltage regulators require an internal inductor for energy storage, leading to increased chip area, complexity, and efficiency losses due to high-frequency switching, and suffer from latency in response time due to threshold-triggered activation.
Innovation Solution
A switching voltage regulator utilizing an active bandpass clamp circuit that is frequency-triggered, eliminating the need for an internal inductor and reducing latency by initiating clamping action as soon as load-step noise is detected, with a parallel architecture design that maintains high efficiency and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an internal inductor is used for energy storage in a switching voltage regulator, then the regulator can maintain stable output voltage, but the chip area increases and device complexity increases
Solution Approach 1:
The patent removes the internal inductor from the voltage regulator circuit, extracting this component entirely from the integrated circuit. The regulator achieves stable output voltage through an active clamp circuit that uses capacitive energy storage and controlled discharge instead of inductive energy storage, thereby eliminating the need for on-chip inductors and reducing chip area.
Solution Approach 2:
The patent replaces the traditional inductive energy storage mechanism with a capacitive energy storage and release mechanism. The active clamp circuit uses capacitors to store energy during the switching cycle and releases it during load transients, substituting the magnetic field-based inductor with an electric field-based capacitor system that can be more easily integrated on-chip.
2Speed
If high-frequency switching is used in a switching voltage regulator, then the regulator responds faster to load changes, but efficiency decreases due to increased switching losses
Solution Approach 1:
The patent employs periodic switching action at an optimized frequency where the active clamp circuit is activated only during necessary transient conditions rather than continuous high-frequency switching. The circuit uses a threshold detector to trigger clamp activation only when voltage droop exceeds a predetermined level, creating a periodic rather than continuous switching pattern that reduces overall switching losses while maintaining fast response capability.
3Ease of operation
If a threshold-triggered activation mechanism is used, then the circuit activation condition is simple to detect, but latency increases due to the minimum droop requirement before activation
Solution Approach 1:
The patent implements preliminary monitoring of the output voltage against a predetermined threshold level continuously, so that when a load transient occurs causing voltage droop, the activation condition is already detected and the clamp circuit can be activated immediately without waiting for additional droop. This preliminary detection mechanism reduces the activation latency while maintaining simple threshold-based detection logic.
Data Source
AI summary
An exemplary voltage correction circuit includes a high-pass filter coupled with an integrated load, and an active clamp coupled with the high-pass filter in a closed-loop feedback arrangement. The high-pass filter includes an impedance network having a frequency response defining a lower frequency boundary of a passband of the voltage correction circuit, and the active clamp has a frequency response defining an upper frequency boundary of the passband of the voltage correction circuit. The active clamp is adapted to receive an input voltage proportional to a load transient within the passband and to generate an output current of the voltage correction circuit that cancels the effects of the load transient. A loop gain of the voltage correction circuit is greater than or equal to one within the passband and is less than one for frequencies lower than the lower frequency boundary and higher than the upper frequency boundary.