Huajingda(HJD) Electronics focus on developing and producing of
high precision crystal resonator (Crystal), crystal oscillator
(SPXO), voltage-controlled crystal oscillator (VCXO), the
prescription for warming crystal oscillator (TCXO), digital
temperature compensation crystal oscillator ( DCXO), constant
temperature crystal oscillator (OCXO), crystal filter (Crystal
Filter). Crystal resonator’s frequency
range: 1.8432 MHZ → 48.0000 MHZ; crystal oscillator’s frequency
range: 1.000 MHZ → 1000 MHZ. And OCXO crystal‘s temperature
stability can get to ± 0.01PPM, TCXO crystal’s temperature stability
is up to ± 0.5PPM. In the general crystal resonator and oscillator,
we would accept high-frequency, partial frequency and small quantity
of high-precision, wide temperature range production.
Quartz crystals are widely used in base communication stations,
radio, television, computers, instrumentation, military
equipment, monitoring equipment, data transmission, medical
measurement equipment, bank ATM equipment, GPS satellite positioning,
the network transmission machine ... Here we give a brief introduction
of the oscillator’s main advantages .Hope this can help customers
① SPXO is the most simple crystal oscillator, it is main made of
crystal components, diode. According to the design requirements,
it’s the frequency component which is integrated in PCB circuit
board assembly and packaged with metal. We also provide
secondary packaging, which use crystal resonator and oscillator
circuit assembly again. This can make the performance of the
products more superior.
② VCXO (voltage-controlled crystal oscillator) is used by a plus
voltage to make frequency modulation or offset, mainly made of
the crystal components, diodes and the oscillation circuit.
The principle is that: by controlling the voltage to change
the modulation of the capacitance diode and traction Crystal
frequency components, and then achieve the desired frequency.
③ TCXO is a crystal oscillator with a compensation system which
can reduce the frequency of changes caused by temperature. It can
be divided into analog and digital compensation, the former mainly
use thermistance’s temperature feedback to simulate the
temperature Compensation with the temperature curve. The Latter use
the digital circuits and devices, through the control of data
storage prescription to control the data, achieve by the
temperature sensor and digital conversion. The latter has
④ OCXO is an oscillator that works by internal temperature to
maintain a stable frequency crystal.
⑤ CF crystal filter use high Q value stability of piezoelectric
quartz crystal’s signal to select frequency.
Our advantages lie in small orders, high-quality orders, partial
and single-frequency orders, high frequency and other orders. But
we don’t do the low frequency and the worst orders (we choose
the sophisticated Crystal and the USA (PTI) IC to install, and
raw materials are tested, storage before install, processes do
not reduce to insure low aging rate and long life.
Credit management, high-quality are our pursuit. Welcome to
inquire, and we will do what we can to help you.