一种频率可调的谐波抑制电路
By designing a frequency-adjustable harmonic suppression circuit, and utilizing source follower differential pairs and an adjustable harmonic suppression filter circuit, the harmonic problem caused by transistor nonlinearity was solved, effectively suppressing the second and third harmonics, and improving the linearity of the signal and the performance of the mixer.
CN115913133BActive Publication Date: 2026-07-17CLIVIA SEMICON TECH CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CLIVIA SEMICON TECH CO LTD
- Filing Date
- 2022-12-26
- Publication Date
- 2026-07-17
AI Technical Summary
Technical Problem
The nonlinearity of transistors causes the output signal to generate second and third harmonics, which degrades the output linearity and generates adjacent channel interference in the mixer.
Method used
A frequency-adjustable harmonic suppression circuit is adopted, including a source follower differential pair, an adjustable harmonic suppression filter circuit and a tail current source. The filter frequency and notch frequency are adjusted by an adjustable capacitor array and a π-type elliptic filter.
Benefits of technology
It achieves effective suppression of second and third harmonics, improves the linearity of the output signal, and reduces adjacent channel interference in the mixer.
✦ Generated by Eureka AI based on patent content.
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Figure CN115913133B_ABST
Abstract
本发明公开了一种频率可调的谐波抑制电路，应用于电子电路设计领域；包括依次串联的由源极跟随差分对构成的第一部分电路、由可调谐波抑制滤波电路构成的第二部分电路、由尾电流源构成的第三部分电路。本发明通过采用源极跟随器结构将信号从高阻抗变换到输出端口的低阻抗，实现输出端口较低的品质因数，有利于实现宽带电路；同时在输出端口采用π型滤波网络，实现对信号的谐波抑制；滤波网络采用开关电容阵列的形式，可以灵活选取电容值以实现较精确的滤波频率，并且滤波频率可调；电路的负载包括滤波网络和尾电流源，尾电流源由电流镜来控制电流，从而为整个电路提供稳定的偏置电流。本发明实现了一种宽带频率可调的谐波抑制电路。
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