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PLL Circuit Using Intermittent Operating Amplifier

A technology of amplifiers and circuits, applied in multiple input and output pulse circuits, electrical components, automatic power control, etc., can solve the problems that PLL circuits are difficult to benefit from

Pending Publication Date: 2022-04-22
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since PLL circuits are usually composed of analog circuits, it is difficult for PLL circuits to benefit from process reduction

Method used

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  • PLL Circuit Using Intermittent Operating Amplifier
  • PLL Circuit Using Intermittent Operating Amplifier
  • PLL Circuit Using Intermittent Operating Amplifier

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0034] In order to solve the above-mentioned problem, in the PLL circuit using the intermittent operation amplifier according to the first embodiment, the intermittent operation is performed by providing a double integration path in series after the integration path, and inputting pulses for intermittent operation into the double integration path amplifier, enabling the dual integration path to operate at low speed. This makes it possible to oscillate the PLL circuit at a high frequency without affecting the stability of the circuit. Hereinafter, the PLL circuit using the intermittent operation amplifier according to the present embodiment will be described in detail.

[0035] (Configuration of a PLL circuit using an intermittent operational amplifier)

[0036] First, one example of the configuration of a PLL circuit 1 (hereinafter, may be abbreviated as "PLL circuit 1") using an intermittent operational amplifier according to the first embodiment will be described. figure ...

no. 2 example

[0064] Next, a second embodiment will be described. Note that each unit having a function similar to that according to the first embodiment is assigned the same reference numeral, and description thereof will be omitted in principle. In the first embodiment, the charge pumps 21, 31 are provided in the integral path 20 and the proportional path 30, respectively. In this embodiment, a PLL circuit using an intermittent operation amplifier from which these charge pumps 21 , 31 are removed will be described.

[0065] (Configuration of a PLL circuit using an intermittent operational amplifier)

[0066] First, one example of the configuration of a PLL circuit 2 (hereinafter, may be abbreviated as "PLL circuit 2") using an intermittent operational amplifier according to the second embodiment will be described. Figure 4 is a block diagram showing one example of a PLL circuit using an intermittent operational amplifier according to the second embodiment.

[0067] like Figure 4 As ...

no. 3 example

[0078] Next, a third embodiment will be described. Note that hereinafter, components having functions similar to those in the first embodiment or the second embodiment are respectively assigned the same reference numerals, and explanations thereof will be omitted in principle. In the first embodiment, the pulse CLK for the intermittent operation for causing the intermittent operation gm amplifier 61 to perform the intermittent operation is fixed. In this embodiment, a description will be given of a PLL circuit using an intermittent operation amplifier, the PLL circuit further including a pulse generator to change the pulse CLK for intermittent operation of the intermittently operating gm amplifier 61 before and after the clock phase is locked. the pulse width.

[0079] (Configuration of a PLL circuit using an intermittent operational amplifier)

[0080] First, one example of the configuration of the PLL circuit 3 (hereinafter, may be abbreviated as "PLL circuit 3") using an ...

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Abstract

The invention relates to a PLL circuit using an intermittent operation amplifier. The PLL circuit includes a phase comparator, an integration path, a proportional path, a current controlled oscillator, a frequency divider and a frequency divider. The dual integration path includes an intermittent operation gm amplifier, a filter circuit, and a voltage-current conversion circuit. The intermittent operation gm amplifier receives the output voltage of the filter circuit. When the pulse CLK for the intermittent operation is ON, the intermittent operation gm amplifier outputs its voltage to the filter circuit. When the pulse CLK for the intermittent operation is OFF, the intermittent operation gm amplifier does not output the output voltage of the filter circuit to the filter circuit. Even when the pulse CLK for intermittent operation is OFF, the input potential of the voltage-current conversion circuit is held by the filter circuit, and the current flows to the current control oscillator. This makes it possible to oscillate at a high frequency without increasing the area of the filter circuit.

Description

[0001] Cross References to Related Applications [0002] The disclosure of Japanese Patent Application No. 2020-177102 filed on October 22, 2020, including specification, drawings and abstract, is incorporated herein by reference in its entirety. technical field [0003] This invention relates to PLL circuits using intermittently operated amplifiers. Background technique [0004] In recent years, a PLL (Phase Locked Loop) circuit is often used as an oscillation circuit mounted on a semiconductor device. A PLL circuit is a circuit configured to control the oscillation frequency of an output signal so that the phase of the reference signal is synchronized with the phase of the output signal. [0005] Recently, while there is a demand for process reduction, the demand for high-frequency oscillation of the ring PLL circuit is increasing. About ten ring PLL circuits are mounted on one system-on-chip (SoC) product. Since the PLL circuit is usually composed of analog circuits, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/091H03L7/18
CPCH03L7/091H03L7/18H03L7/1075H03L7/102H03L7/093H03L7/099H03L2207/06H03K5/26
Inventor 元泽笃史
Owner RENESAS ELECTRONICS CORP