Interpolation Circuit Using Capacitor Copying to Reduce Signal Loss

Solution Overview

Problem

Existing interpolation circuits face challenges in generating accurate interpolation data while minimizing signal loss and reducing circuit complexity as data rates increase, particularly due to the increased number of switches which can lead to signal loss and increased impedance.

Innovation Solution

The proposed interpolation circuit employs a plurality of holding circuits to chronologically hold input data and a generating circuit that assigns weights based on an interpolation code to adjacent data points, combining them to generate interpolation data without the need for additional switches, thereby reducing signal loss and circuit complexity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the number of switches is increased to handle higher data rates, then the data transmission capability is improved, but the signal loss and impedance increase

Engineering Contradiction:

Improvedata transmission capabilityVSAvoidsignal loss

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The invention extracts and eliminates the unnecessary switches from the interpolation circuit. By using a structure that generates interpolation signals through capacitor charging/discharging and voltage comparison without requiring additional switches, the patent removes the source of signal loss and impedance increase while maintaining high data transmission capability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention uses capacitor copies to store and reproduce input signal values at different time points. Instead of using multiple switches to route signals, the patent creates voltage copies in capacitors that can be combined through simple voltage division and comparison, achieving the same function without the harmful switches.

Inventive Principle:

Principle #26Copying

2Productivity

If the number of switches is increased to handle higher data rates, then the data transmission capability is improved, but the circuit complexity increases

Engineering Contradiction:

Improvedata transmission capabilityVSAvoidcircuit complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The invention extracts and eliminates the unnecessary switches from the interpolation circuit. By using a structure that generates interpolation signals through capacitor charging/discharging and voltage comparison without requiring additional switches, the patent removes the source of signal loss and impedance increase while maintaining high data transmission capability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention uses capacitor copies to store and reproduce input signal values at different time points. Instead of using multiple switches to route signals, the patent creates voltage copies in capacitors that can be combined through simple voltage division and comparison, achieving the same function without the harmful switches.

Inventive Principle:

Principle #26Copying

3Adaptability or versatility

If switches are added to generate interpolation data, then the interpolation function is achieved, but the circuit area increases

Engineering Contradiction:

Improveinterpolation functionVSAvoidcircuit area

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The invention extracts and eliminates the unnecessary switches from the interpolation circuit. By using a structure that generates interpolation signals through capacitor charging/discharging and voltage comparison without requiring additional switches, the patent removes the source of signal loss and impedance increase while maintaining high data transmission capability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention changes the operational parameters of existing circuit elements (capacitors and comparators) to achieve interpolation functionality. By dynamically controlling capacitor charging/discharging timing and using voltage division ratios, the patent achieves time-interpolation without adding spatial complexity in the form of additional switches.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9165166B2Interpolation circuit and receiving circuit

Publication Date: 2015.10.20 FUJITSU LTD

AI summary

An interpolation circuit includes: a plurality of holding circuits configured to each hold a corresponding input data input chronologically; and a generating circuit configured to generate interpolation data by giving weights, based on an interpolation code, to input data that are chronologically adjacent to each other and are held by the plurality of holding circuits and combining the weighted data together.