Compound Pin Driver Controller for Signal Fidelity

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Solution Overview

Problem

Existing test systems for electronic devices face challenges in providing high fidelity test signals with improved pulse edge placement accuracy and bandwidth, while being cost-effective and power-efficient, due to parasitic loading and large component sizes associated with traditional class A and class AB driver circuits.

Innovation Solution

A compound stage with high impedance environment is introduced, which accommodates a wide range of voltage and current signals, and includes a control system with a current switch circuit and bias control circuit to generate switched test signals, reducing parasitic loading and enabling smaller, more cost-effective driver components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional class A or class AB driver circuits are used, then power handling capability is sufficient, but parasitic loading increases and bandwidth decreases

Engineering Contradiction:

Improvesignal fidelityVSAvoidparasitic loading

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The driver circuit is divided into multiple independent stages: a switching stage that generates current signals and a compound stage that converts current to voltage. This segmentation allows each stage to be optimized independently, reducing parasitic loading while maintaining signal fidelity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A compound stage is introduced as an intermediary between the switching stage and the DUT. This compound stage acts as a buffer that converts current signals to voltage signals, isolating the switching stage from parasitic loading effects and improving bandwidth.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Power

If larger driver components are used to handle power, then power handling capability improves, but device size and cost increase

Engineering Contradiction:

Improvepower handling capabilityVSAvoiddevice size

Core Design Contradiction:

PowerVSArea of stationary object

Solution Approach 1:

The patent replaces traditional voltage-driven mechanical switching with a current-driven switching mechanism. Current signals are used to control the switching stage, which then drives the compound stage. This substitution allows for smaller, more integrated devices while maintaining power handling capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the operating parameters of the driver circuit by using current-mode signaling instead of traditional voltage-mode signaling. This parameter change enables the use of smaller components with lower parasitic effects while maintaining the required power handling capability through the compound stage's current-to-voltage conversion.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If traditional switching circuits are used, then simplicity is maintained, but pulse edge placement accuracy and bandwidth are limited

Engineering Contradiction:

Improvecircuit simplicityVSAvoidpulse edge placement accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent introduces dynamic control mechanisms in the switching stage, where switching timing and duration are precisely controlled to achieve accurate pulse edge placement. The compound stage dynamically converts current signals to voltage signals, maintaining bandwidth while improving edge accuracy through controlled signal transformation.

Inventive Principle:

Principle #15Dynamics

4Speed

If class A driver circuit is used for high bandwidth, then bandwidth improves, but power consumption increases

Engineering Contradiction:

ImprovebandwidthVSAvoidpower consumption

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

The switching stage operates in a periodic switching manner rather than continuous operation, allowing the circuit to achieve high bandwidth during active switching periods while consuming less power during transition and idle periods. This periodic action replaces the continuous operation of class A amplifiers.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The compound stage maintains continuous current-to-voltage conversion throughout the signal cycle, ensuring that the useful action of signal transformation continues without interruption. This continuous conversion maintains bandwidth while the switching stage's periodic operation reduces overall power consumption compared to continuous class A operation.

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentUS11264906B2Compound pin driver controller

Publication Date: 2022.03.01 ANALOG DEVICES INC

AI summary

A pin driver control system for enhancing pulse fidelity can include a first current switch circuit with a current input node and a voltage input node, wherein the first current switch circuit provides a switched output current signal in response to a voltage control signal at the voltage input node. The system can further include a first current source configured to receive a bias control signal and, in response, provide a drive current signal to the current input node of the first current switch. The drive current signal can have a magnitude that exceeds a magnitude of the switched output current signal. The system can further include a bias control circuit configured to receive information about a desired bias current magnitude for use by the first current switch circuit and, in response, provide the bias control signal to the first current source.