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

VCO

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

Active Publication Date: 2016-11-16
BRIGATES MICROELECTRONICS KUNSHAN
View PDF6 Cites 0 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

[0056] 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 voltage regulation unit 23, an input PMOS transistor MP0, and a differential-to-single-ended circuit COMP.

[0057] Specifically, the current mirror circuit 21 includes a reference transistor Mr, a mirror transistor Mm and a reference current source I0.

[0058] 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 groun...

Embodiment 2

[0085] 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 voltage adjustment unit 33, an input PMOS transistor MP0, and a differential-to-single-ended circuit COMP. Embodiment 2 Compared with Embodiment 1, the voltage-controlled oscillator further includes a level shift circuit 34, and the level shift circuit 34 is adapted to reduce the control voltage vc and then input it into the input PMOS transistor MP0 the grid.

[0086] For the current mirror circuit 31 , the fully differential ring oscillator 32 , the voltage adjustment unit 33 , the input PMOS transistor MP0 and the differential-to-single-ended circuit COMP, reference may be made to the description in Embodiment 1, and details are not repeated here.

[0087] The level shift circuit 34 includes a first source follower 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 voltage adjustment unit 43, a level down shift circuit 44, an input PMOS transistor MP0, and a differential-to-single-ended circuit COMP. Compared with Embodiment 2, Embodiment 3 differs in that: the first source follower further includes a resistor R, and the source of the second NMOS transistor MN2 is connected to the third NMOS transistor MN3 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 second NMOS transistor MN2, and the other end of the resistor R is connected to the drain of the third NMOS transistor MN3 and the gate of the input PMOS transistor MP0.

[0103] The current mirror circuit 41, the fully...

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, comprising: an input PMOS transistor, a current mirror circuit, a fully differential ring oscillator and a differential-to-single-ended circuit, wherein the gate of the input PMOS transistor is suitable for inputting the control of the voltage-controlled oscillator voltage, the output terminal of the current mirror circuit is connected to the source of the input PMOS transistor and the positive power supply terminal of the fully differential ring oscillator, and the output terminal of the fully differential ring oscillator is connected to the differential to single-ended circuit The voltage-controlled oscillator further includes a voltage regulation unit adapted to control the voltage of the negative power supply terminal of the fully differential ring oscillator to decrease as the control voltage increases. The voltage-controlled oscillator provided by the technical solution of the invention can expand the adjustment range of the control voltage and output high-frequency signals under low power 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] Voltage-controlled oscillator (VCO, voltage-controlled oscillator) is one of the main components of phase-locked loop (PLL, phaselocked loop), its function is to adjust the oscillation of the oscillator under the control of the control voltage output by the low-pass filter Frequency, which makes the oscillator output a periodic signal whose frequency changes 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 ...

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