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Delay unit, voltage-controlled oscillator and frequency band extension method of voltage-controlled oscillator

A voltage-controlled oscillator and delay unit technology, applied in power oscillators, electrical components, etc., can solve problems such as insufficient frequency band coverage, reduced voltage-controlled oscillator output clock swing, etc., and achieve linearization of current regulation , the effect of reducing disturbance and speeding up

Pending Publication Date: 2019-10-22
XI AN UNIIC SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the technical problem that the frequency band coverage of the existing voltage-controlled oscillator is not wide enough, and the swing of the output clock of the voltage-controlled oscillator will be reduced, the present invention provides a delay unit, a voltage-controlled oscillator comprising the delay unit device and the frequency band extension method of the voltage controlled oscillator

Method used

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  • Delay unit, voltage-controlled oscillator and frequency band extension method of voltage-controlled oscillator
  • Delay unit, voltage-controlled oscillator and frequency band extension method of voltage-controlled oscillator
  • Delay unit, voltage-controlled oscillator and frequency band extension method of voltage-controlled oscillator

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Experimental program
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Effect test

Embodiment 1

[0047] refer to figure 1 and Figure 5 , the voltage controlled oscillator includes a bias module and a three-stage cascaded delay unit. Each delay unit includes input pair transistors NMOS transistors M1 and M2; cross-coupling transistors NMOS transistors M3 and M4; tail current transistors NMOS transistors M5 and M6; variable resistor arrays R1, R2 and variable capacitor arrays C1 and C2; The variable capacitance arrays C1 and C2 have the same structure.

[0048] refer to Figure 5 and Figure 6 , The variable capacitor arrays C1 and C2 are both 3bit controlled. Wherein, the variable capacitor array C1 includes a first switch tube sn1, a first switch tube sn2, a first switch tube sn3, a capacitor cn1, a capacitor cn2 and a capacitor cn3. The first switch tube sn1, the first switch tube sn2 and the first switch tube sn3 are all NMOS tubes.

[0049] The gate of the first switching tube sn1 is connected to the control signal selcap, the source of the first switc...

Embodiment 2

[0059] The structure of embodiment 2 is similar to that of embodiment 1, the only difference is that the MOS transistors M1-M6 in embodiment 2 are all PMOS transistors.

Embodiment 3

[0061] Embodiment 3 is similar in structure to Embodiment 2, and the only difference is that in Embodiment 3, both the first switching transistor and the second switching transistor are PMOS transistors.

[0062] refer to Figure 9 and Figure 10 , The variable capacitor arrays C1 and C2 are both 3bit controlled. Wherein, the variable capacitor array C1 includes a first switch tube sn1, a first switch tube sn2, a first switch tube sn3, a capacitor cn1, a capacitor cn2 and a capacitor cn3. The gate of the first switching tube sn1 is connected to the control signal selcap, and the source of the first switching tube sn1 is connected to the voltage source V DD , the drain of the first switching tube sn1 is connected to one end of the capacitor cn1. The other end of the capacitor cn1 is connected to the node between the variable resistor array R1 and the PMOS transistor M1, the gate of the first switching transistor sn2 is connected to the control signal selcap, and the s...

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Abstract

The invention relates to an integrated circuit, in particular to a delay unit, a voltage-controlled oscillator and a frequency band expansion method of the voltage-controlled oscillator. The technicalproblems that the frequency band coverage range of an existing voltage-controlled oscillator is not wide enough, and the swing amplitude of an output clock of the voltage-controlled oscillator is reduced are solved. According to the technical scheme, the delay unit comprises input geminate transistors MOS M1 and M2, variable resistor arrays R1 and R2, and variable capacitor arrays C1 and C2. Oneend of the variable capacitor array C1 is connected with a node between the variable resistor array R1 and the MOS transistor M1, and one end of the variable capacitor array C2 is connected with a node between the variable resistor array R2 and the MOS transistor M2. The other ends of the variable capacitor C1 and the variable capacitor C2 are connected with a power supply signal. Meanwhile, the invention further provides a voltage-controlled oscillator which comprises at least two delay units. Any one of the delay units is adopted as the delay unit. In addition, the invention also provides afrequency band expansion method of the voltage-controlled oscillator.

Description

technical field [0001] The invention relates to an integrated circuit, in particular to a delay unit, a voltage-controlled oscillator and a frequency band extension method of the voltage-controlled oscillator. Background technique [0002] The voltage-controlled oscillator is an important unit in the field of communication and electronics. Its oscillation frequency can change with the change of the external control voltage, and it is widely used in circuits such as phase-locked loops, clock recovery, and frequency synthesis. [0003] Such as figure 1 As shown, the existing voltage-controlled oscillator includes a bias module and multiple delay units connected in series; wherein, the number of delay units is determined according to the clock frequency to be output and the delay time of the delay units. Generally, the number of delay units is 2-5. [0004] Such as figure 2 As shown, the structure of the bias module in the existing voltage-controlled oscillator is shown. Th...

Claims

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Application Information

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IPC IPC(8): H03B5/12
CPCH03B5/1228H03B5/1237
Inventor 成俊陈婷余珈
Owner XI AN UNIIC SEMICON CO LTD
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