Shanghai Huali Microelectronics Corporation

Zhili Wang

Haifeng Wang

Yifei Qian

Yuchun Liu

Xuanli Zhu

Xiaofeng Su

This application discloses a system for turning off power consumption of an auxiliary startup circuit. An oscillator generates a switch control signal based on a reference current output by a circuit to be started up to generate a working clock of a switch control signal generation circuit after the circuit to be started up works normally. After fixed clock signal counting, the switch control signal generation circuit outputs a switch control signal to control power consumption of normally open current of the auxiliary startup circuit to be turned off. At the same time, the switch control signal generation circuit stops counting the clock. This application can assist the circuit to be started up having a 'degeneracy' bias point to power on normally, and can also turn off the power consumption of the auxiliary startup circuit after the circuit to be started up is powered on.

System for turning off power consumption of auxiliary startup circuit

The present invention includes a voltage controlled oscillator circuit and a phase-locked loop device. The voltage controlled oscillator circuit comprises: a voltage-to-current conversion module, used for converting a control voltage of a voltage controlled oscillator into a control current as a linear function of the control voltage; and a current controlled oscillation module, used for outputting a low-amplitude oscillation signal based on the control current, so as to reduce power consumption. Further provided in the present invention is a phase-locked loop device comprising the voltage controlled oscillator circuit. According to the voltage controlled oscillator circuit, design parameters of low power consumption and high linearity may be achieved, thereby making a gain Kvco of the voltage controlled oscillator relatively stable, and it may be ensured that the voltage controlled oscillator and the phase-locked loop comprising the same have relatively excellent device performance.

Voltage controlled oscillator structure and phase-locked loop

An oscillator comprising an RC oscillator and a bandgap reference source, wherein the bandgap reference source provides a reference current for the RC oscillator, and a temperature coefficient of the reference current is adjustable. Since the oscillation frequency of the RC oscillator has less dependency on a power supply, a clock source having a relatively precise frequency thus can be obtained; and based on the RC oscillator, the bandgap reference source having a temperature compensation function is added, the reference current generated by the bandgap reference source with an adjustable temperature coefficient is used for temperature coefficient compensation to the inherent temperature coefficient of the oscillation frequency of the RC oscillator, thereby reducing the effect of the temperature on the oscillator, so that the output frequency of the oscillator does not change with the temperature as far as possible, which improves the oscillation frequency precision of the oscillator.

Oscillator

The present invention discloses a voltage-controlled oscillator (VCO) circuit, When the VCO circuit works, the DC control voltage is divided into two portions, both of which determine an oscillation frequency of the VCO circuit. One portion of the DC control voltage controls a current provided by the fifth PMOS transistor, and the other portion of the DC control voltage controls the current of the forth PMOS transistor after passing through the third NMOS transistor, thereby controlling oscillation of the VCO circuit. The former plays a leading role when the DC control voltage is relatively low, and the latter plays a leading role when the DC control voltage is relatively high, thereby effectively increasing the use range of the DC control voltage while the high frequency noise interference on the DC control voltage is suppressed. The present invention further discloses a phase-locked loop circuit.

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Shanghai, China

Zhili Wang