July 2nd, 2021
Nihon Dempa Kogyo Co., Ltd.
Representative Director and President
Hiromi Katoh
Development of ｆloor noise-185 dBc/ Hz at 100kHz ultra-low phase noise 100MHz OCXO
Nihon Dempa Kogyo Co., Ltd. has developed an ultra-low phase noise 100MHz OCXO
(crystal oscillator with temperature chamber) "NH37M28LP" and is planning to ship samples fromOctober 2021.
By adopting our unique low-noise circuitry for applications such as measurement instruments, radar systems,
medical equipment, and microwave reference signals, this product will become the second release of our Low
Noise OCXO in Ultimate series(*1), which achieves the world's highest level (*2) of low-floor noise (-185 dBc/Hzor lower at 100kHz).
In the IoT social in recent years, various kinds of information are rapidly increasing, and in order toprocess these large amounts of data at high speed, a high frequency reference signal source with low noiseand high purity is required in radio equipment and measurement instruments.
Current measurement instruments generally use a 10MHz OCXO as a reference signal source, but there
have been challenges in which the floor noise deteriorates by multiplying the frequency in the equipment
and increasing the frequency. This has resulted in complicated circuitry, such as the additional
filters
components are needed.
In addition to our low-noise crystal oscillator circuit technology, we have added a circuit that suppresses
noise from the inside and outside of the oscillator circuit by placing a crystal unit with a filter effect in theoscillator loop.
In the output section, we use our unique sine wave output circuit to output the oscillation signal withminimal noise.
This makes it possible to multiply the frequency from 100MHz inside the equipment. In addition to theadvantages (theoretical conversion at 1GHz) of 20dB compared to the conventional multiplication from10MHz, considering the low floor noise characteristics of this product, the performance can be expected to
be improved by approximately 30 to 50dB compared to the conventional product, and the circuit size canbe reduced.
The reference signal source with ultra-low phase noise characteristics realized by this product contributes
to a greatly improvements in equipment performance not only in measurement equipment and radarequipment, but also in new fields such as audio products and special applications.
We will continue to contribute to the realization of a safe, secure and comfortable society through ourquartz device and crystal application equipment businesses.
*1: Our survey as of March 2021
*2: The first Ultimate series. Ultimate low Noise VCXO (announced on our website in May 2021)[Exterior Photo][Sample and mass production]
The sample (ES) is scheduled in October 2021 and for mass production in January 2022.
[Specifications/Characteristics]
Model

NH37M28LP

Size

36×27.0×19 mm

Nominal frequency range100MHzOutput support

Sine wave

Operating temperature range-20deg.C～＋70deg.C(Option : -40deg.C～＋85deg.C)
Max.±100×10-9

Frequency Temperature Characteristics
Power supply voltage [VCC]
Phase noise characteristics+5V
Typ. -114 dBc/Hz at 10Hz offset
Typ. -185 dBc/Hz at 100kHz offset

Phase noise characteristic data
Condition: Nominal frequency 100MHz, power supply voltage [VCC] +5V, temperature +25deg.C

Measured value
Limit level of measurement

For inquiries regarding products, please contact [Contact] below.
【Contact】
NIHON DEMPA KOGYO CO., LTD.
e-mail：newsrelease@ndk.com