Integrated Circuit Phase Difference Control Using Tunable Capacitors
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Solution Overview
Problem
Prior-art integrated high-frequency front-end circuits face inefficiencies due to phase deviations from ideal 90 or 180-degree phase offsets, which are difficult to correct with existing calibration methods that require significant chip area and have low precision.
Innovation Solution
An integrated circuit arrangement with a chain of basic circuits, each having controllable phase-influencing means and a phase difference detector, uses a control unit to generate control signals for tunable capacitive units to set a precise phase difference between signals, reducing area requirements and improving resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration circuits based on switchable resistance networks are used to compensate phase deviations, then phase correction is achieved, but chip area requirement increases and precision remains relatively low
Solution Approach 1:
The patent changes the fundamental parameter used for phase correction from resistance values to capacitance values. By using tunable capacitive units instead of switchable resistance networks, the system achieves higher phase correction precision while reducing chip area, as capacitive tuning provides finer control over phase differences in the high-frequency signal path
Solution Approach 2:
The patent replaces the resistive calibration mechanism with a capacitive tuning mechanism. This substitution allows for more precise phase control through digital tuning of capacitive units, achieving better measurement precision with reduced hardware area requirements compared to traditional resistance-based approaches
2Adaptability or versatility
If traditional calibration methods are used, then phase deviation compensation is possible, but the control range is relatively narrow and resolution is low
Solution Approach 1:
The patent segments the phase control function into multiple tunable capacitive units that can be independently adjusted. This segmentation allows for fine-grained control of phase differences, achieving high resolution while providing a broad control range through the combined effect of multiple segmented tuning elements
Solution Approach 2:
The patent implements dynamic phase control through digitally tunable capacitive units that can be adjusted in real-time. This dynamic tuning capability provides both a wide control range and high resolution, as each capacitive unit can be independently tuned to achieve precise phase compensation across varying operating conditions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables precise phase setting with a reduced chip area requirement, broad control range, and high resolution, effectively correcting phase deviations and maintaining phase accuracy across different frequencies and frequency bands.
Implementation Method 1
Each controllable phase-influencing means has at least one first tunable capacitive unit, which is connected to the first transmission line and the control unit and is designed to delay the first signal depending on a digital control voltage of the first control signal
Data Source
AI summary
An integrated circuit arrangement (1; 2; 3; 4) for setting a predefined phase difference (phi_target) between a first high-frequency signal (x1; x1p, x1n) and a second high-frequency signal (x2; x2p, x2n), comprising:e) a chain connection of a plurality (N) of basic circuits (10; 20; 30; 40), whereby each basic circuit has a first transmission line (11; 11p, 11n) for transmitting the first signal (x1; x1p, x1n), a second transmission line (12; 12p, 12n) for transmitting the second signal (x2; x2p, x2n), and a controllable phase-influencing means (13; 23; 33; 43), connected to the first transmission line, for controllably influencing the phase of the first signal,f) a phase difference detector (14; 34), which is connected to the output-side basic circuit and is formed to detect a current phase difference (phi_actual) between the first and second signal,g) a control unit (15; 35), which is connected to the phase difference detector and each controllable phase-influencing means (13; 23; 33; 43) and is formed to generate first digital control voltages, dependent on the current phase difference (phi_actual), as control signals (vt1, vt2, . . . ) for each phase-influencing means (13; 23; 33; 43), whereby the digital control voltage can assume only two different voltage values, andh) whereby each controllable phase-influencing means (13; 23; 33; 43;) has at least one first tunable capacitive unit (16; 16p, 16n; 46p, 46n), which is connected to the first transmission line and the control unit and is designed to delay the first signal depending on one of the first control signals.