A Voltage Controlled Oscillator with Low Power Consumption, Low Noise and High Linear Gain

Abstract

The invention discloses a voltage-controlled oscillator with low power consumption, low noise and high linear gain, comprising: a first inductance, a second inductance, a distributed varactor structure circuit, a negative resistance differential pair circuit, a tail current tube circuit and an amplitude The detection circuit; the first inductance, the second inductance and the distributed varactor structure circuit form an LC resonant network, which is used to generate the oscillation signal of the VCO with low power consumption, low noise and high linear gain; the negative resistance differential pair circuit and the LC resonant The network connection is used for energy compensation of the LC resonant network; the tail current tube circuit is connected to the output terminal of the voltage-controlled oscillator, which adopts the self-bias principle to generate a DC bias voltage as a power supply voltage to provide a DC current for the LC resonant network ; The amplitude detection circuit is connected to the output terminal of the voltage-controlled oscillator, and is used to provide body bias voltage for the negative resistance differential pair circuit and the tail current tube circuit. In the present invention, low power consumption, low noise and high linear gain of the voltage-controlled oscillator can be realized.

Description

technical field [0001] The invention relates to the technical field of radio frequency integrated circuits, in particular to a voltage-controlled oscillator with low power consumption, low noise and high linear gain. Background technique [0002] At present, a high-speed and stable clock signal is a prerequisite for many applications, such as high-performance analog-to-digital converters, high-speed serial data communications, wireless transceivers, etc. Therefore, for low power consumption, low jitter, high-speed phase-locked The demand for the PLL is increasing day by day, and in the design process of the phase-locked loop, a high-performance VCO (Voltage Controlled Oscillator, voltage-controlled oscillator) is the key. [0003] PLL is the first choice for generating low-jitter and high-frequency clocks. A typical integer-division PLL structure includes five parts: frequency detector, phase detector, charge pump, loop filter, voltage-controlled oscillator, and frequency di...

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Problems solved by technology

[0013] Figure 1 to Figure 4 It shows the development direction of VCO. These four methods have their own advantages, but they also have their own shortcomings, which cannot meet the needs.

At present, a tail current source fixed bias VCO that adopts the principle of body bias is commonly used in the market, such as Figure 5 shown in the Figure 1 to Figure 4 Further improvements have been made on the basis of the body bias principle to reduce the threshold voltage of the MOS tube, so that the LC-tank VCO (LC resonant voltage-controlled oscillator) can work at a very low supply voltage and achieve low power consumption, but its noise needs to be improved

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