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Common-mode controlled inductance-capacitance voltage-controlled oscillator

A technology of voltage-controlled oscillators and inductors, applied in the direction of electrical components, automatic power control, etc., can solve the problems of deteriorating the phase noise characteristics of the phase-locked loop, deteriorating the common-mode suppression characteristics of the circuit, etc., and achieve the effect of good phase noise characteristics

Active Publication Date: 2011-06-15
苏州云芯微电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will seriously deteriorate the phase noise characteristics of the PLL
Not only that, the non-50% duty cycle clock will also deteriorate the common mode rejection characteristics of the circuit in some high-performance applications (such as high-speed high-precision ADC / DAC)

Method used

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  • Common-mode controlled inductance-capacitance voltage-controlled oscillator
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  • Common-mode controlled inductance-capacitance voltage-controlled oscillator

Examples

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0021] Such as figure 1 shown, where the negative resistance PMOS tube M 1 , M 2 , Negative resistance NMOS tube M 3 , M 4 , tail current PMOS transistor M P , inductor L and adjustable capacitor C form the core part of the oscillator; the inverter U 1 , U 2 , PMOS tube M 5 -M 8 , NMOS tube M 9 -M 12 , compensation capacitor C C And the tail current NMOS transistor MN forms a common mode point control circuit; the inverter U 3 -U 6 to drive the inverter. During circuit operation, V OSCP and V OSCN go through U first 1 and U 2 Shaping and sending to M 5 -M 12 composed of monitoring circuits. Suppose V OSCP and V OSCN The common mode point is high, U 1 and U 2 After shapi...

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Abstract

The invention discloses an inductance-capacitance voltage-controlled oscillator, which comprises negative resistance P-channel metal oxide semiconductor (PMOS) transistors M1 and M2, negative resistance N-channel metal oxide semiconductor (NMOS) transistors M3 and M4, an inductor L and an adjustable capacitor C, and is characterized in that: the inductance-capacitance voltage-controlled oscillator comprises a common-mode control circuit for controlling common mode points of oscillating signals VOSCP and VOSCN, wherein the common-mode control circuit comprises phase inverters U1 and U2, a compensating capacitor CC, a tail-current NMOS transistor MN, a tail-current PMOS transistor MP and a monitoring circuit. Compared with the traditional inductance-capacitance voltage-controlled oscillator, the common-mode controlled inductance-capacitance voltage-controlled oscillator successfully solves the problem that the output clock duty deviates 50 percent due to offset of negative resistance tube voltage-current transfer characteristics; therefore, good phase noise characteristics of a phase locked loop can be guaranteed.

Description

technical field [0001] The invention belongs to the field of semiconductor integrated circuit design, and in particular relates to an inductance-capacitance voltage-controlled oscillator. Background technique [0002] As one of the core modules of electronic systems, phase-locked loops are widely used in the fields of communication equipment, test instruments, computers and consumer electronics. In recent decades, due to the rapid development of microelectronics technology, modern electronic systems are also advancing towards high performance and high integration. Taking the wireless communication system as an example, with the approach of the 4G era, higher-speed broadband digital communication services are about to start. This puts higher demands on the radio frequency (RF) transceiver module, data conversion module (ADC / DAC) and digital processor (DSP) in the system. And all these modules need to work under the clock drive provided by the phase-locked loop, so the perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/099
Inventor 李云初严伟赵士燕
Owner 苏州云芯微电子科技有限公司
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