Phase comparison circuit and radio frequency chip

By combining a phase comparison circuit with an amplifier, frequency divider, Schmitt trigger, flip-flop, and filter unit, the problems of narrow phase detection range, numerous components, and high power consumption in existing phase comparison circuits are solved, achieving high-precision, low-power phase detection that is suitable for RF chips.

CN122348739AActive Publication Date: 2026-07-07LANSUS TECH INC
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Patent Information

Application Number
CN202610817764.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-08
Publication Date
2026-07-07
Estimated Expiration
2046-06-08

AI Technical Summary

Technical Problem

Existing phase comparison circuits suffer from problems such as signal nonlinearity distortion, weak anti-interference capability, poor temperature drift characteristics, limited phase detection range, large number of components, low integration, high static power consumption, and strong electromagnetic radiation in high-frequency radio frequency signal processing.

Method used

A phase comparison circuit consisting of a first amplifier, a second amplifier, a frequency divider, a Schmitt trigger, a flip-flop, an AND gate unit, and a filter unit is used. The phase is compared after the frequency is reduced by the frequency divider. The phase detection in the range of 0-360° is achieved by combining the flip-flop and the AND gate unit, and noise is filtered out by the Schmitt trigger.

Benefits of technology

It achieves accuracy and stability in wide-range phase detection, reduces circuit complexity and power consumption, reduces the number of components, lowers production costs, and extends product life.

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Abstract

The invention is suitable for the technical field of radio frequency, and particularly relates to a phase comparison circuit and a radio frequency chip. The phase comparison circuit comprises a first amplifier, a second amplifier, a first frequency divider, a second frequency divider, a first Schmitt trigger, a second Schmitt trigger, a first trigger, a second trigger, an AND gate unit, a first filtering unit and a second filtering unit. The input end of the first amplifier is used for receiving a first radio frequency signal, the output end of the first amplifier is connected with the input end of the first frequency divider, the input end of the second amplifier is used for receiving a second radio frequency signal, and the output end of the second amplifier is connected with the input end of the second frequency divider; the first frequency divider and the second frequency divider are respectively used for carrying out frequency reduction on the amplified first radio frequency signal and the amplified second radio frequency signal; compared with the prior art, the phase comparison circuit provided by the invention is simple in structure, wide in phase discrimination range, stable in output and capable of effectively reducing the power control complexity of the radio frequency front end.
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