Unlock instant, AI-driven research and patent intelligence for your innovation.

VCO

A technology of voltage-controlled oscillators and ring oscillators, which is applied in the direction of automatic power control and electrical components, and can solve the problem of low output signal frequency

Active Publication Date: 2015-12-23
BRIGATES MICROELECTRONICS KUNSHAN
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The present invention solves the problem that the frequency of the output signal of the existing voltage-controlled oscillator is low when it works under low power supply voltage

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • VCO
  • VCO
  • VCO

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] figure 2 is a circuit diagram of the voltage-controlled oscillator according to Embodiment 1 of the present invention. refer to figure 2 , the voltage-controlled oscillator includes a current mirror circuit 21, a fully differential ring oscillator 22, a level shift circuit 23, an input PMOS transistor MP0, and a differential-to-single-ended circuit COMP.

[0061] Specifically, the current mirror circuit 21 includes a reference transistor Mr, a mirror transistor Mm and a reference current source I0.

[0062] The first electrode of the reference transistor Mr is connected to the first electrode of the mirror transistor Mm and is suitable for inputting the power supply voltage Vdd of the voltage-controlled oscillator, and the second electrode of the reference transistor Mr is connected to the gate and connected to The gate of the mirror transistor Mm and one terminal of the reference current source I0 ; the other terminal of the reference current source I0 is grounded;...

Embodiment 2

[0096] image 3 is a circuit diagram of a voltage-controlled oscillator according to Embodiment 2 of the present invention. refer to image 3 , the voltage-controlled oscillator includes a current mirror circuit 31, a fully differential ring oscillator 32, a level shift circuit 33, an input PMOS transistor MP0, a differential-to-single-ended circuit COMP and a second PMOS transistor MP2. The difference between embodiment 2 and embodiment 1 is that: the negative power supply terminal Vnn of the fully differential ring oscillator 32 is grounded through the second PMOS transistor MP2.

[0097] Specifically, the source of the second PMOS transistor MP2 is connected to the negative power supply terminal Vnn of the fully differential ring oscillator 32 , the gate of the second PMOS transistor MP2 is connected to the drain and grounded.

[0098] For the current mirror circuit 31, the fully differential ring oscillator 32, the level shift circuit 33, the input PMOS transistor MP0, a...

Embodiment 3

[0101] Figure 4 is a circuit diagram of a voltage-controlled oscillator according to Embodiment 3 of the present invention. refer to Figure 4 , the voltage-controlled oscillator includes a current mirror circuit 41, a fully differential ring oscillator 42, a level shift circuit 43, an input PMOS transistor MP0, and a differential-to-single-ended circuit COMP. Compared with Embodiment 1, Embodiment 3 differs in that: the first source follower further includes a resistor R, and the source of the first NMOS transistor MN1 is connected to the second NMOS transistor MN2 through the resistor R. drain and the gate of the input PMOS transistor MP0.

[0102] Specifically, one end of the resistor R is connected to the source of the first NMOS transistor MN1, and the other end of the resistor R is connected to the drain of the second NMOS transistor MN2 and the gate of the input PMOS transistor MP0.

[0103] The current mirror circuit 41, the fully differential ring oscillator 42, t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A voltage-controlled oscillator comprises an input PMOS tube, a current mirror circuit, a fully differential ring oscillator and a differential to single-ended circuit, wherein the output end of the current mirror circuit is connected with the source electrode of the PMOS tube and the positive power supply end of the fully differential ring oscillator, the output end of the fully differential ring oscillator is connected with the input end of the differential to single-ended circuit, and the voltage-controlled oscillator further comprises an electrical level shift-down circuit suitable for reducing control voltage of the voltage-controlled oscillator and inputting the control voltage to the grid electrode of the PMOS tube. The voltage-controlled oscillator can enlarge the regulating range of the control voltage and output high-frequency signals under low supply voltage.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a voltage-controlled oscillator. Background technique [0002] The voltage-controlled oscillator (VCO, voltage-controlled oscillator) is one of the main components of the phase-locked loop (PLL, phaselockedloop). Its function is to adjust the oscillation frequency of the oscillator under the control of the control voltage output by the low-pass filter. A periodic signal that makes the oscillator output frequency change linearly with the change of the control voltage. [0003] figure 1 It is a circuit diagram of an existing voltage-controlled oscillator. refer to figure 1 , the voltage-controlled oscillator includes: an input PMOS transistor mp0, a current mirror circuit 11, a fully differential ring oscillator 12, a differential-to-single-ended circuit comp, and a tail current source MOS transistor mi. [0004] Specifically, the gate of the input PMOS transistor m...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/099
Inventor 黄从朝
Owner BRIGATES MICROELECTRONICS KUNSHAN