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Differential ring oscillation circuit, device, and oscillation control method

A ring oscillation circuit, ring oscillation technology, applied in the direction of automatic power control, electrical components, generation of electrical pulses, etc., to avoid deadlock state

Inactive Publication Date: 2014-03-12
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At the same time, such an oscillation circuit may enter a state called deadlock due to a failure in the oscillation state, and thus no clock is generated in some cases.

Method used

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  • Differential ring oscillation circuit, device, and oscillation control method
  • Differential ring oscillation circuit, device, and oscillation control method
  • Differential ring oscillation circuit, device, and oscillation control method

Examples

Experimental program
Comparison scheme
Effect test

example 2

[0036] 3. Modification example 2 of activation circuit ( Figure 6 )

[0037] 4. Modification example 3 of activation circuit ( Figure 7 and Figure 8 )

[0038] 5. Other deformation examples

Embodiment approach

[0040] figure 1 is a diagram showing an example of the configuration of a device including the differential ring oscillation circuit 10 according to an embodiment of the present disclosure.

[0041] The differential ring oscillation circuit 10 is four delay circuits 11, 12, 13, and 14 connected in a ring so that an oscillation signal having a predetermined frequency can be obtained. The delay circuits 11 to 14 each delay and output 2-phase output signals having mutually different levels. Here, the amounts of delay of the signals in the delay circuits 11 to 14 are set to be the same. The oscillation frequency of the differential ring oscillation circuit 10 is determined based on the amount of delay of each of the delay circuits 11 to 14 and the number of stages to which the delay circuits 11 to 14 are connected.

[0042] A case where each of the delay circuits 11 to 14 outputs 2-phase signals having levels different from each other is a case of a correct operation state. Whe...

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PUM

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Abstract

The invention relates to differential ring oscillation circuit, device, and oscillation control method. The differential ring oscillation circuit includes a differential ring oscillation unit in which delay circuits, to which signals of 2 phases are input, and which delay and output the input signals of 2 phases, are connected at even stages in a ring form, first and second common-mode level detection units that detect that the input signals of 2 phases of one delay circuit at an even stage of the differential ring oscillation unit and the input signals of 2 phases of one delay circuit at an odd stage of the differential ring oscillation unit are at same predetermined levels, respectively, and first and second switches that set, to specific potentials, one of the output signals of 2 phases of the delay circuit delaying the input signals of 2 phases, when the first and second common-mode level detection units detect the same predetermined levels, respectively.

Description

technical field [0001] The present disclosure relates to a differential ring oscillation circuit, a device including the differential ring oscillation circuit, and an oscillation control method for controlling the differential ring oscillation circuit. Background technique [0002] A differential ring oscillation circuit including an even-numbered stage delay circuit has been used in various devices as a clock generation circuit. For example, a differential ring oscillation circuit including an even-numbered stage delay circuit has been used as a clock generation circuit that supplies a clock to a plurality of flip-flops included in a wired communication device and connected in parallel. In parallel-connected flip-flops included in wired communication equipment, a multi-phase clock shifted by 1 / 2 cycle or 1 / 4 cycle from the reference phase is essential. In a quadrature modulator or a quadrature demodulator included in a wireless communication device, a multiphase clock shif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/099
CPCH03K3/0322H03L7/00H03L3/00H03K3/014
Inventor 丸子健一片仓雅幸
Owner SONY CORP