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

Bias circuit and phase-locked loop circuit using the same

A bias current, phase-locked loop technology, applied in the direction of electrical components, adjusting electrical variables, automatic power control, etc., to achieve the effect of low VCO gain and low jitter

Inactive Publication Date: 2014-07-30
MEDIATEK INC
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a large VCO gain in the PLL circuit brings many drawbacks

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
  • Bias circuit and phase-locked loop circuit using the same
  • Bias circuit and phase-locked loop circuit using the same
  • Bias circuit and phase-locked loop circuit using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] Certain terms are used in the specification and following claims to refer to particular elements. It should be understood by those skilled in the art that hardware manufacturers may use different terms to refer to the same element. This description and the subsequent claims do not use the difference in name as the way to distinguish components, but use the difference in function of the components as the criterion for distinguishing. "Include" mentioned throughout the specification and subsequent claims is an open-ended term, so it should be interpreted as "including but not limited to". Moreover, "substantially" mentioned throughout the specification and subsequent claims is also an open term. In addition, the term "coupled" herein includes any direct and indirect means of electrical connection. Therefore, if it is described in the text that a first device is coupled to a second device, it means that the first device may be directly electrically connected to the secon...

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 bias circuit for generating output bias current, a phase-locked loop circuit and the bias circuit. The bias circuit for generating the output bias current includes: a first transistor having a first node, a second node and a control node, the first node is coupled to a first reference voltage; a passive element is coupled to the first reference between the voltage and the control node of the first transistor; the second transistor has a first node, a control node and a second node, the first node of the second transistor is coupled to the control node of the first transistor, and the control node of the second transistor coupled to the second node of the first transistor, the second node of the second transistor is used to provide an output bias current according to the current flowing through the passive element; and a bias current generator, coupled to the second node of the first transistor , the bias current generator is used to provide the bias current to the first transistor. One of the effects of the present invention is to provide a PLL circuit with low jitter and low VCO gain.

Description

technical field [0001] The present invention relates to generating a bias current, and in particular to a bias circuit, a phase-locked loop circuit and a bias circuit for generating an output bias current. Background technique [0002] Generally, with the advancement of integrated circuit processing technology, the reduction of minimum channel width and supply voltage leads to improvements in operating speed, power and area consumption of digital circuits. However, high-level integration makes the design of analog support circuits more complex, such as a phase-locked loop (PLL) used to generate clocks in high-performance systems. [0003] One of the challenges of PLL design in advanced manufacturing processes is that the gain of the voltage controlled oscillator (Voltage Controlled Oscillator, VCO) must be very large. Taking a PLL circuit with a GHz output frequency as an example, a VCO gain of several GHz / V is usually required to compensate for process and temperature vari...

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): H03L7/08
CPCH03L7/0995G05F3/242
Inventor 刘学欣
Owner MEDIATEK INC