Low-Voltage Phase Shifter for Beam Side Lobe Control
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Solution Overview
Problem
Conventional phase shifters face difficulties in operating at low voltages and lack the ability to provide an antenna weight factor for phase array antennas, limiting their functionality.
Innovation Solution
A phase shifter design that utilizes a digital signal to control current through an amplification circuit with a current path selection circuit, cascode circuit, and RLC output load, enabling operation at low voltages and providing phase control and antenna weight factor adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional phase shifter uses a vector sum with four stages of transistors, then phase control is achieved, but it cannot operate at low voltage
Solution Approach 1:
The phase shifter is divided into multiple independent stages: signal generator, operator (with input circuit, path selection circuit, and cascode circuit), and signal converter. Each stage performs a specific function, allowing the circuit to operate efficiently at low voltages while maintaining reliable phase control capability.
2Adaptability or versatility
If a conventional phase shifter is designed for basic phase control, then simplicity is maintained, but it lacks the function of providing antenna weight factor
Solution Approach 1:
The phase shifter is designed to perform multiple functions: phase control through the operator circuit and antenna weight factor adjustment through the signal converter that controls current magnitudes. This multi-functional design allows a single device to handle both phase shifting and amplitude control for phase array antennas, improving adaptability while managing complexity through integrated circuit architecture.
Data Source
AI summary
Disclosed is a phase shifter, which includes a signal generator that generates a first signal and a second signal having a phase orthogonal to a phase of the first signal, and outputs the first signal and the second signal, an operator that generates a first current and a second current, and amplifies the first current and the second current, and a signal converter converting a first digital signal and a second digital signal. The operator includes an input circuit converting the first signal and the second signal, a path selection circuit determining paths of the generated first current and the generated second current, and a cascode circuit buffering the first current and the second current. The operator sums the first current and the second current, controls a vector of the first current and a vector of the second current, and generates a voltage signal through an output load.