Compact, high-stability TCXO for indoor small base stations

October 12, 2012
Nihon Dempa Kogyo Co., Ltd.
President: Hiroshi Takeuchi
Compact, high-stability TCXO
for indoor small base stations (femtocells) developed
Nihon Dempa Kogyo Co., Ltd. has developed a compact high-stability temperature compensated
crystal oscillator (TCXO) for use in small mobile base stations (femtocells) installed indoors or in
underground shopping malls (dimensions 5.0×3.2×2.0 mm, Hold over frequency stability(*) max.
±100 ppb / -10°C to +70°C).
To support high-speed, high-capacity data communications using mobile communication
terminals as specified in new telecommunication standards including Long Term Evolution (LTE),
higher frequencies for higher-volume data transmission must be available. However, higher
frequencies are more likely to travel in a straight line and are thereby less likely to turn around
obstacles. For this reason indoor spaces such as residential houses and underground shopping malls
eventually include places where radio waves cannot be reached (i.e., blind spots). What
complements this macrocell network with blind spots associated with it are independent smaller base
stations called femtocells. Even blind spots in the macrocell network can reliably receive radio
waves with a femtocell nearby. Femtocells are expected to become more and more popular to reduce
the load of macrocell network stations suffering from increasingly busy communications traffic.
The newly developed TCXO features compactness, low power consumption (typ. 12 mW) and
quick start-up after power-on based on an assumption that the product is used in ordinary houses.
NDK has made full use of its own expertise in high-stability oscillating circuits to successfully
develop this TCXO satisfying the required frequency stability as a reference oscillator for a base
station in spite of its compactness. The new product will contribute to the elimination of blind spots
of the macrocell network through introduction of more and more femtocell base stations as well as
lower communications traffic in macrocell base stations.
Delivery of product samples is planned to be launched in October 2012 and mass production in
January 2013.
(*) Hold over frequency stability : including frequency temperature characteristics, stability, supply
voltage change and aging of 24 hours.
<Contact> Sales Representative, Nihon Dempa Kogyo Co., Ltd.
e-mail: [email protected]
* For sample requests, please contact NDK sales personnel or send an e-mail to
the address above.
The detailed specifications are shown below:
Nominal frequency
14.4 MHz, 19.2 MHz, 20 MHz, 26 MHz
Hold over frequency stability (*)
Max. ±100×10-9
Operating temperature range
-10 to +70°C
Long-term frequency stability
Max. ±3×10-6/10 years
Supply voltage
+3.3V ±5%
Current consumption
Max. 15mA
Variable frequency range
Min. ±5×10-6/+1.65V ±1.65V
Output waveform
(*)Hold over frequency stability: including temperature stability, supply voltage change and aging
of 24 hours.
External Dimensions