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Circuit filter and lock phase circuit

A loop filter and circuit technology, applied in the direction of automatic power control, electrical components, multi-terminal pair network, etc., can solve the problems of capacitor occupation and large area, and achieve the effect of large equivalent capacitance value

Active Publication Date: 2010-07-14
VIA TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the larger the capacitance value of the loop filter, the larger the area occupied by the capacitor used

Method used

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  • Circuit filter and lock phase circuit
  • Circuit filter and lock phase circuit
  • Circuit filter and lock phase circuit

Examples

Experimental program
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Effect test

Embodiment Construction

[0018] In order to make the above and other objects, features and advantages of the present invention more comprehensible, a preferred embodiment is exemplified below and described in detail in conjunction with the accompanying drawings.

[0019] figure 1 It is an embodiment of a loop filter. Such as figure 1 As shown, the loop filter 11A includes a capacitor C1 having a first terminal coupled to the node ND1 and a second terminal coupled to a ground terminal. For example, the terminal ND1 is the current pump of the phase-locked loop (such as Figure 7 shown), but not limited thereto.

[0020] Assuming that the voltage across capacitor C1 is V1, the current Ic flowing through capacitor C1 can be expressed as:

[0021] Ic = C 1 × dV 1 dt - - - ( 1 )

[0022] In other words, in When it is fixed...

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PUM

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Abstract

The invention relates to a loop filter and a phase-locking loop, wherein, the loop filter comprises a first resistor, a first capacitor, a second resistor, an operational amplifier and a second capacitor; the first resistor is provided with a first end which is coupled to a first node and a second end which is coupled to a second node; the first capacitor is coupled between the second node and earth voltage; the second resistor is provided with a first end which is coupled to the first node and a second end which is coupled to a third node; the operational amplifier is provided with an noninverting input end which is coupled to the second node, an inverted input end which is coupled to the third node, and an output end; the second capacitor is coupled between the output end of the operational amplifier and the third node. The loop filter and the phase-locking loop can provide the same equivalent capacitance values by using smaller area or provide large equivalent capacitance values byutilization of the same area.

Description

Technical field [0001] The invention is related to the circuit filter, which is particularly related to a circuit filter that can increase the electricity value. Background technique [0002] In the current synchronous system (such as computer systems and communication equipment), the circuit generated by the session is a very important part.For example, the Phase lookloop (PLL) circuit is widely used in frequency synthesis, timing correction, timing distribution, and phase demodulation. [0003] Generally speaking, traditional lock phase circuits include PHASE / FREQUENCY Detector (PFD), one -current pump (Charge Pump), a loop filter, one voltage control oscillator (VoltageControlOScillator, VCO) and Divider.The phase frequency detector is compared with a feedback timeline and a transitional edges to generate a comparison signal, which makes the current pump charge and discharge.Furthermore, the circuit filter will generate the control voltage according to the charging and dischar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/08H03L7/089H03L7/093H03L7/18H03H11/12
Inventor 刘中鼎曲静然
Owner VIA TECH INC