Passive Phase Interpolator Using RC Networks for Stable Accuracy
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Solution Overview
Problem
Existing phase interpolators constructed with current sources and current mirrors are expensive, inaccurate, unstable, and large in size due to the need for precise manufacturing and tuning over process, voltage, and temperature variations.
Innovation Solution
A phase interpolator is constructed using passive components such as capacitors and resistors, which are easier to manufacture, smaller in size, and more accurate, achieving phase shift through component value selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current sources and current mirrors are used to construct a phase interpolator, then phase interpolation functionality is achieved, but the device becomes expensive, inaccurate, unstable, and large in size
Solution Approach 1:
The patent replaces active electronic components (current sources and current mirrors) with passive components (resistors and capacitors) to construct the phase interpolator. This substitution eliminates the need for complex active circuitry while achieving the same phase interpolation function, thereby reducing device complexity and improving reliability.
Solution Approach 2:
The patent achieves phase interpolation by varying the values of passive components (resistors and capacitors) rather than using complex active circuit configurations. By selecting specific component values, the desired phase shift is obtained, simplifying the overall circuit design and reducing manufacturing costs.
2Manufacturing precision
If current sources and current mirrors are constructed with specified precision, then phase interpolation accuracy is improved, but manufacturing cost and device size increase
Solution Approach 1:
The patent substitutes passive components for active components, eliminating the need for precise matching and tuning of current sources and mirrors. Passive components like resistors and capacitors are easier to manufacture with standard tolerances, significantly reducing manufacturing cost and improving ease of production.
Solution Approach 2:
The patent employs inexpensive passive components that can be manufactured with standard precision rather than requiring expensive, high-precision active components. This approach reduces the overall manufacturing cost while achieving sufficient performance for the application.
3Speed
If current sources and current mirrors are used to achieve phase interpolation, then phase shift functionality is obtained, but the device size becomes large
Solution Approach 1:
The patent replaces the large-area active circuitry (current sources and mirrors) with compact passive components (resistors and capacitors). This substitution significantly reduces the circuit area while maintaining the phase shift functionality, making the phase interpolator suitable for integrated circuit applications where space is limited.
Data Source
AI summary
A phase interpolator for generating a phase interpolated output signal between two phase separated input signals received at two phase separated input signal nodes may include a plurality of circuit elements. The plurality of circuit elements may include at least one of resistors or capacitors, in a series arrangement between the two phase separated input signal nodes, where respective connection points between respective ones of the plurality of circuit elements may provide at least one intermediate phase interpolated signal. The phase interpolator may also include selection circuitry, which may be configured to select the phase interpolated output signal from the at least one intermediate phase interpolated signal.