# US 2017/0288685 A1 · Oscillator circuit

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- Number: US 2017/0288685 A1
- Document ID: US20170288685A1
- Status: Published application
- Kind: A1
- Application number: 15/473,613
- Filed: 2017-03-30
- Published: 2017-10-05
- Earliest claimed: 2016-04-01
- Assignees: Nihon Dempa Kogyo Co., Ltd.
- Applicants: Nihon Dempa Kogyo Co., Ltd.
- Inventors: Ken MIYAHARA
- Web page: https://patentgrep.com/patent/US20170288685A1

## CPC

- H03L 7/18: using a frequency divider or counter in the loop (H03L7/20, H03L7/22 take precedence)
- H03L 7/08: Details of the phase-locked loop
- H03L 7/085: concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal (H03L7/10 takes precedence; circuits for comparing the phase or frequency of two mutually-independent oscillations H03D13/00)
- H03L 7/093: using special filtering or amplification characteristics in the loop (H03L7/087 - H03L7/091 take precedence)
- H03L 7/095: using a lock detector (H03L7/087 takes precedence)
- H03L 7/099: concerning mainly the controlled oscillator of the loop
- H03L 7/16: Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L 2207/50: All digital phase-locked loop
- H03L: AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES (generation of oscillations H03B)

## Abstract

An oscillator circuit includes an oscillating unit, a counter unit, and a set value generator. The oscillating unit is configured to output an oscillation signal having a frequency corresponding to an input frequency setting value. The counter unit is configured to count a number of pulses of the oscillation signal during a time period corresponding to a period of a reference signal input from outside. The set value generator is configured to generate the frequency setting value every predetermined time period based on the count of the pulses counted by the counter unit.

## Claims

### Claim 1

An oscillator circuit comprising:
an oscillating unit configured to output an oscillation signal having a frequency corresponding to a frequency setting value being input;
a counter unit configured to count a number of pulses of the oscillation signal during a time period corresponding to a period of a reference signal input from outside; and
a set value generator configured to generate the frequency setting value every predetermined time period based on the count of the pulses counted by the counter unit.

### Claim 2 (depends on 1)

The oscillator circuit according to claim 1, further comprising:
an integration unit configured to calculate an integrated value of a difference between a reference pulse number corresponding to the frequency of the oscillation signal and a pulse number of the oscillation signal every period of the reference signal, and output the integrated value every time period of predetermined times of the period of the reference signal, wherein
the set value generator controls the frequency setting value based on the integrated value.

### Claim 3 (depends on 2)

The oscillator circuit according to claim 2, wherein
the set value generator is activated every integration period of an integral multiple of the period of the reference signal to vary the frequency setting value based on the integrated value.

### Claim 4 (depends on 3)

The oscillator circuit according to claim 3, wherein
the integration unit initializes the integrated value every time that the integration period terminates.

### Claim 5 (depends on 3)

The oscillator circuit according to claim 3, wherein
the integration unit adds a first integrated value at the termination of the integration period to a second integrated value at a next integration period so as to calculate the integrated value.

### Claim 6 (depends on 3)

The oscillator circuit according to claim 3, wherein
the integration unit outputs the integrated value every integration period determined based on a time period permitted for synchronizing the oscillation signal with the reference signal.

### Claim 7 (depends on 2)

The oscillator circuit according to claim 2, wherein
the set value generator generates the frequency setting value based on a smoothed integrated value generated by smoothing a plurality of the integrated values.