Voltage-controlled oscillator and electronic device

By employing parallel PMOS and NMOS cross-coupled pairs and an LC resonant circuit in the voltage-controlled oscillator, combined with a bias circuit to adjust the substrate voltage, the noise performance and circuit robustness are optimized, solving the problem of insufficient noise performance in the prior art, and making it suitable for low-voltage environments.

CN114567261BActive Publication Date: 2026-06-12ZHONGKE SAIFEI (GUANGZHOU) SEMICON CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHONGKE SAIFEI (GUANGZHOU) SEMICON CO LTD
Filing Date
2022-02-28
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Existing voltage-controlled oscillators (VCOs) have shortcomings in noise performance and applicability, making it difficult to meet the requirements of fifth-generation wireless communication systems, especially in scenarios with low voltage and limited frequency resources.

⚗Method used

Parallel PMOS cross-coupled pairs and NMOS cross-coupled pairs are used to provide negative resistance. Combined with an LC resonant circuit, the substrate voltage of the cross-coupled pairs is adjusted by a bias circuit to optimize noise performance. The current mirror structure is abandoned to reduce the number of active devices and stacked layers.

🎯Benefits of technology

It achieves excellent performance in low-noise and low-voltage scenarios, is suitable for wearable and portable devices, and improves the robustness and frequency stability of the circuit.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a voltage-controlled oscillator and electronic equipment, comprising bias circuit, core circuit and buffer stage circuit connected in sequence, wherein the core circuit comprises PMOS cross-coupled pair, NMOS cross-coupled pair and LC resonant loop connected in parallel. Compared with the prior voltage-controlled oscillator, the core circuit of the voltage-controlled oscillator utilizes PMOS cross-coupled pair and NMOS cross-coupled pair to provide negative resistance, reduces the number and stack number of active devices in the core circuit, and is beneficial to optimization of noise performance of the voltage-controlled oscillator and low-voltage implementation. Meanwhile, the voltage-controlled oscillator adjusts the substrate voltage of the PMOS cross-coupled pair and the NMOS cross-coupled pair in the core circuit through the bias circuit, so that the voltage-controlled oscillator can work at low voltage and low power consumption, the current of the core circuit and the amplitude of the MOS tube transconductance changing with environmental factors such as temperature can be reduced, and the circuit robustness is improved.
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