Inverter-Based Comparator Trip-Point Control for High Bandwidth
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Solution Overview
Problem
Conventional comparator circuits face challenges in achieving high bandwidth while minimizing power consumption and circuit complexity, with variability in trip points due to process, voltage, and temperature (PVT) variations affecting precision.
Innovation Solution
A comparator circuit architecture that regulates voltage levels on power supply and ground nodes to adjust the trip point of inverter circuits, using a regulator circuit with a hybrid output stage and replica inverters to maintain precision and reduce power consumption, and an output circuit to adjust voltage levels for full rail operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional comparator circuits are designed to achieve high bandwidth, then the bandwidth is improved, but power consumption increases and circuit complexity increases
Solution Approach 1:
The patent changes the operating parameters of the comparator circuit by using a regulated power supply node with a specific voltage level that is adjusted based on a threshold value. This parameter adjustment allows the comparator to achieve high bandwidth while controlling power consumption through optimized voltage levels rather than simply increasing all circuit parameters.
Solution Approach 2:
The patent implements dynamic adjustment of the power supply voltage level to the comparator core based on the threshold value being compared. This dynamic operation allows the circuit to adapt its power consumption and performance characteristics in real-time, achieving high bandwidth only when needed while reducing power consumption during normal operation.
2Speed
If conventional comparator circuits are designed to achieve high bandwidth, then the bandwidth is improved, but circuit complexity increases
Solution Approach 1:
The regulated power supply node serves multiple functions: it provides the operating voltage to the comparator core, sets the trip point threshold, and enables high bandwidth operation. By making this single component multi-functional, the patent avoids the need for separate circuits for each function, thereby reducing overall circuit complexity while achieving high bandwidth.
Solution Approach 2:
The patent introduces a regulator circuit as an intermediary between the power supply and the comparator core. This intermediary component simplifies the overall design by centralizing the voltage regulation and threshold setting functions in one place, rather than distributing complex control logic throughout the comparator circuit.
3Measurement precision
If trip point is adjusted to improve precision, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the regulated power supply node voltage is adjusted based on the threshold value to maintain an accurate trip point. The regulator circuit continuously monitors and adjusts the voltage level to ensure the comparator operates at the correct threshold, providing automatic correction without requiring complex external calibration circuits.
Data Source
AI summary
A comparator circuit included in a computer system employs an inverter circuit as a high-speed comparison circuit. To allow the inverter circuit to compare an input signal to a particular threshold value, a trip point of the inverter circuit is adjusted to match the threshold value by modifying a voltage level of a power supply node coupled to the inverter. To modify the voltage level of the power supply node, a replica of the inverter circuit is biased to generate a bias signal that corresponds to the trip point of the inverter circuit. A comparator circuit compares the bias signal to the threshold value, and adjusts the voltage level of the power supply node using results of the comparison. An output circuit adjusts an output of the inverter circuit to generate a full-rail output signal.