A device with high power supply rejection ratio lc-vco

Abstract

The invention relates to a high-power-supply-rejection-ratio LC-VCO (LC-Voltage Controlled Oscillator) device, which comprises a complementary cross-coupled LC-VCO and a linear voltage regulator. The output end Vout of the linear voltage regulator is connected with the common-mode end VCM of the LC resonant circuit of the complementary cross-coupled LC-VCO. Therefore, the high-power-supply-rejection-ratio LC-VCO device has the advantages that 1) the design is reasonable, the structure is simple and the device is fully practical; and 2) the power supply noise suppression capability of the output voltage of the linear voltage regulator can be adjusted through the circuit and the power supply sensitivity of the LC-VCO can be reduced.

Description

technical field [0001] The invention relates to an oscillator device, in particular to an LC-VCO device with high power supply rejection ratio. Background technique [0002] The radio frequency oscillator is one of the core modules of the wireless communication system. It is usually used in the phase-locked loop system to provide a stable local carrier signal for the transceiver. LC-VCO has become the mainstream structure of RF oscillator design due to its advantages of low phase noise, low power consumption and wide frequency tuning range. Integrate the RF oscillator into the wireless RF communication SoC, the monolithic integration of wireless RF communication reduces the total tape-out and packaging costs, and meets the needs of low power consumption and compact design, but the digital, analog and RF modules share the same substrate The digital switching power supply noise generated by the large-scale digital part can easily be transmitted through the power grid and comm...

AI Technical Summary

Problems solved by technology

Integrate the RF oscillator into the wireless RF communication SoC, the monolithic integration of wireless RF communication reduces the total tape-out and packaging costs, and meets the needs of low power consumption and compact design, but the digital, analog and RF modules share the same substrate The way of power supply and power supply leads to large-scale digital section. Digital switching power supply noise can easily be transmitted through the power grid and common substrate to the sensitive RF oscillator and deteriorate its performance.

Images