Power Matters.TM
GPSDO and Ruggedized Timing
Products
Paul R. Gerry
Senior Product Manager, Clocks BU
Paul.Gerry@microsemi.com
© 2014 Microsemi Corporation. COMPANY PROPRIETARY
1
Agenda
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GPSDO Background Information
RCM Ultra Low Noise 10MHZ/100MHz Reference
OCXO Based GPSDOs
CSAC Based GPSDOs
Low Cost LTE-Lite GPSDOs
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What Does a GPSDO Do?
 GPS signals carry the Colorado NIST UTC master timesignal to the user. We decode this time signal, and
generate a local version of it by controlling a local
oscillator:
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Why Use A GPSDO?
 Primary frequency references like Cesium, Rubidium have
drift
• Temperature, g-sensitivity, C-field error, aging, relativistic effects
 Free Running Oscillators: Synchronized
• Frequency-Locked-Loop (poor phase coherence)
 GPS Locked Oscillators: Synchronized
• Phase-Locked-Loop (phase coherence to UTC)
• Better than 5E-013/24Hrs possible with Quartz
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In a GPSDO, the GPS Signal Provides…..
 1PPS (pulse per second) within ~ ±25ns typ. of UTC
• Independent of position
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WAAS/EGNOS/MSAS error correction
PVT vector
Date/Time, down to the nanosecond level
Health information of Satellites
Major drawback:
• Large sawtooth type jitter on the 1PPS
• Outages are frequent, 1PPS missing occasionally
• Foliage, Shading, Multipath induced errors
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RCM Ultra Low Noise 100MHz, 10MHz,
1 PPS Reference Module
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RCM Reference
 Holdover <+4us over 24-hrs typ.
 Phase Noise of only -100dBc/Hz at 10Hz offset from the
100MHz carrier
 Phase noise floor of -172dBc/Hz
 Dual Frequency
• One Ultra-stable 10MHz CMOS output, Two 100 MHz sinewave
outputs
 Allan Deviation of 2E-12 @ 1 sec
 PPS signals have 2.5ns resolution
 Supports external 10MHz or 1PPS signals reference inputs
tight phase-lock to internal oscillators
 Operating temperature range -40°C to +85°C
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RCM Reference
 Applications
• Radar Local oscillator for applications requiring ultra-low phase noise
• Synchronized Radio applications
• Phase-noise-filter applications for Rubidium or Cesium references
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Ruggedized SSM-2650 -->SCM
 Application: 24/7 search for any type of Communication
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to identify its Direction & Location
Key req: Ultra Extreme Sensitive & Accurate timing of the
remote sensors to the C&C Center
Multiple remote Sensor units (1-N) which must be within 2
nsec diff from the Master Sync server
Ultra Low Phase Noise of: – 170dBc
Embedded VPX Sensor module
Rugged / MIL- STD
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The “Standard / Commercial” offering
XLi
GPS Signal Distribution
Remote Sync.
& 100Mhz Ref.
Clk.
# 1 10MHz
#N 100MHz
Sensor Sync.
Embedded
cards
vs. BC635’s
#2 10MHz
SSM-2650
100Mhz Ref.
board
#3 10MHz
#N 10MHz
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RCM - 100MHz Phase Noise : SSM2650
option
RCM phase noise req.:
1 Hz
4 Hz
10 Hz
100 Hz
1 KHz
10 KHz
100 KHz
1 MHz
10 MHz
100 MHz
<= -70 dBc
<= -98 dBc
<= -103 dBc
<= -118 dBc
<= -146 dBc
<= -158 dBc
<= -160 dBc
<= -163 dBc
<= -170 dBc
<= -170 dBc
-163 dBc is nice…buy not meeting the spec.
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!
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Microsemi & Focus’s - New Solution
 New RCM design: Dual isolated 100MHz Ultra-Low Phase-Noise floor
of -172dBc/Hz with +20.5dBm power . Allows external 10MHz or 1PPS
signals to tightly phase-lock
 ADEV of 2E-012 with low-g 100MHz osc. - phase-locked to the 10MHz
DOCXO disciplined & provides 1PPS signals with 2.5ns resolution
 Allowing 1PPS phase-locked to the 100MHz output even in the
absence or failure of the external 1PPS or 10MHz references - for
stand alone operation
This is on the Physics limit !!
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RCM - Rugged VPX 1.1” Conduction
Cooled Embedded Module
 This application required the unit to be ruggedized to 167 & 810
MIL STD Embedded VPX module in Conduction cooled ATR Chassis
 Customized packaging design for of the new RCM 100Mhz board
Rugged RCM VPX CC Module product !
Packaged as Rugged VPX module
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RCM Ultra Low Noise Reference Module
 2.0 X 4.0 X 1.0 In, ruggedized
 1 PPS input to capture resolution of
±2.5 ns
 Dual Frequency outputs
•
•
1 10 MHz 5V CMOS output
2 100 MHz sinewave outputs
 Phase Noise (172dBc/Hz floor)
10MHz
1Hz
<-90dBc/Hz
10Hz
<-125dBc/Hz
100Hz <-145dBc/Hz
1KHz
<-150dBc/Hz
10kHz <-150dBc/Hz
100kHz <-150dBc/Hz
100MHz
<-70dBc/Hz
<-98dBc/Hz
<-128dBc/Hz
<-153dBc/Hz
<-160dBc/Hz
<-165dBc/Hz
 Ultra-low-g sensitivity (less than
0.3ppb per g per axis)
 Operating Temperature range -40°C
to +85°C
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OCXO Based GPSDOs
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GPS-1000 10Mhz OCXO-based GPSDO
 Small 1.0” x 2.5” x 0.5” package
 Holdover of ±11 µs over a 3-hr.
 Compatible with GPS, WAAS,
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EGNOS, MSAS; Galileo-ready
1 PPS Accuracy of ±50 ns to UTC
RMS (1-sigma), GPS-locked.
Output – 1 10 MHz output sinewave
Power consumption <1.4W typical
Phase Noise
1Hz -80dBc/Hz
10Hz -110dBc/Hz
100Hz -135dBc/Hz
1kHz -145dBc/Hz
10kHz <-145dBc/Hz
 Operating Temperature range of 0° C
to +60° C
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GPS-2500/2550 DOCXO-based GPSDO
 Small 1.5” x 3” x 0.8” package.
 Holdover ±7 µs over 24-hr.
 Compatible with GPS, WAAS,
EGNOS, MSAS; Galileo-ready.
 1 PPS Accuracy of ±50 ns to UTC
RMS (1-sigma), GPS-locked.
 Output - 5 10 MHz – 2 LVDS and 3
sinewave.
 Phase noise
1Hz -80dBc/Hz
10Hz -110dBc/Hz
100Hz -135dBc/Hz
1kHz -145dBc/Hz
10kHz <-145dBc/Hz
 Operating Temperature range of
0°C to +75°C; extended range of
25°C to +75°C available.
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GPS-2600/2650 DOCXO-based GPSDO
 1.5” x 4” x 0.8” package.
 Holdover of ±7 µs over a 24-hr.
 Compatible with GPS, WAAS,
EGNOS, MSAS; Galileo-ready.
 1 PPS Accuracy of ±30 ns to UTC
RMS (1-sigma), GPS-locked.
 Output 7 100Mhz - 2 sine, 4 LVDS, 1
CMOS; 2 10Mhz - 1 sine, 1 LVDS
 Phase noise
1Hz -60dBc/Hz
10Hz -95dBc/Hz
100Hz -118dBc/Hz
1kHz -140dBc/Hz
10kHz -155dBc/Hz
100kHz -160dBz/Hz
 Operating Temperature range of 0° C
to +75° C; 25° C to +75° C available.
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CSAC Based OCXOs
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Benefits of a GPSDO module vs. a CSAC
Component
 CSAC total errors: ±2ppb (temp/age/gauss/cal etc)
• GPS: << 0.2ppb within <20min
 Module is plug-and-play, CSAC requires design-in
• (system sale vs. component sale)
 Phase Noise improvement: up to 13dB, >80% of spurs
removed
 Wider range of power supplies -- GPSDO can use vehicle power
supply (8V to 36V) or USB; CSAC requires +3.3V.
 Handling of common GPS anomalies and optimization for
mission profile (Airborne, Vehicle, Manpack)
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Additional Features -- Software Interface
 Well known control interfaces (NMEA, SCPI, GPSCon,
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NTP etc)
Support for NMEA-0813 ver. 2.3 (Google Earth, etc)
USB Plug and Play, LCD driver built-in
Easy-to-use English commands, examples:
Help?
Syst:status?
GPS?, CSAC?
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GPSDO with CSAC Compared GPSDO with
OCXO Holdover?
 CSAC Holdover after 20 minutes with GPS: typically better
than 2us per day.
 OCXO Holdover after 20 minutes with GPS: <13us over 4
hours (state of the art)
 OCXO Holdover after 5 days with GPS: typically 1us to
2us per day. (SC-cut)
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GPSDO Benefits for Targeted Markets
 •Manpack Systems:
• Low power extends battery life.
• Very fast warm-up (legacy products: 15+ min)
• Very low-g while on move.
 Airborne Systems:
• Low phase noise under vibration
• Wider temperature range than OCXO
• Low SWaP and low profile
 Stationary Systems:
• Position and Hold mode
• Holdover for up to 1 week
• Long UPS life, independent of temperature
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GPS 2700/2750
 2” X 2.5” X 0.7” package
 Holdover of ±1 µs over 24-hrs typ.
 Compatible with GPS, WAAS,
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EGNOS, MSAS
1 PPS Accuracy of ±15 ns to UTC
RMS (1-sigma), GPS-locked.
Outputs - 4 10MHz Sinewave; 1
5MHz CMOS 5V
Power <1.5W, <1W CMOS option
Phase Noise
10Hz -75dBc/Hz
100Hz -115dBc/Hz
1KHz -128dBc/Hz
10kHz -134dBc/Hz
100kHz -140dBc/Hz
 Operating Temperature range of
-10ºC to +70ºC
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HD-CSAC
 2” X 2.5” X 0.7” package
 Holdover of ±1 µs over 24-hrs typ.
 Compatible with GPS, WAAS,
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EGNOS, MSAS
1 PPS Accuracy of ±15 ns to UTC
RMS (1-sigma), GPS-locked.
Outputs - 1 10MHz LVDS and 1
10MHz CMOS 5V
Power <1.25W
Phase Noise
10Hz -75dBc/Hz
100Hz -115dBc/Hz
1KHz -128dBc/Hz
10kHz -134dBc/Hz
100kHz -140dBc/Hz
 Operating Temperature range of
-10ºC to +70ºC.
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LP-CSAC
 2” X 2.5” X 0.7” package
 Holdover of ±1 µs over 24-hrs typ.
 Compatible with GPS, WAAS,
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EGNOS, MSAS
1 PPS Accuracy of ±15 ns to UTC
RMS (1-sigma), GPS-locked.
Outputs - 1 10MHz LVDS and 1
10MHz CMOS 3.3V
Power - <0.55 W
Phase noise
10Hz -75dBc/Hz
100Hz -115dBc/Hz
1KHz -128dBc/Hz
10kHz -134dBc/Hz
100kHz -140dBc/Hz
 Operating Temperature range of 10°
C to +70° C
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LTE-Lite TCXO Based GPSDOs
Low-cost Small-Cell Frequency and Timing Reference
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LTE-Lite 19.2 MHz
 0.7” x 1.18” x 0.09” package.
 <±50us over 3 Hour Period (25°C)
 Compatible with, QZSS, SBAS
WAAS, EGNOS, MSAS
 Outputs - 2 19.2 MHz CMOS; 1 PLL
synthesized configurable
76.8/38.4/25.6/15.36/12.8/9.6/4.8 MHz
 Phase Noise (noise floor <155dBc/Hz)
1Hz -65dBc/Hz
10Hz -92dBc/Hz
100Hz -116dBc/Hz
1kHz -136dBc/Hz
10kHz -148dBc/Hz
100KHz <-155dBc/Hz
 Operating Temperature -10°C to
+70°C, -40°C to +85°C optional
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LTE-Lite 20 MHz
 0.7” x 1.18” x 0.09” package.
 <±50us over 3 Hour Period (25°C)
 Compatible with, QZSS, SBAS
WAAS, EGNOS, MSAS
 Outputs - 2 20 MHz CMOS; 1 PLL
synthesized configurable
80/40/26.666/16/13.333/10/5 MHz
 Phase Noise (noise floor <155dBc/Hz)
1Hz -65dBc/Hz
10Hz -92dBc/Hz
100Hz -116dBc/Hz
1kHz -136dBc/Hz
10kHz -148dBc/Hz
100KHz <-155dBc/Hz
 Operating Temperature -10°C to
+70°C, -40°C to +85°C optional
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The GPSDO Demo Kit
 The GPSDO demo kit allows you to easily demonstrate the
usefulness of a board-level GPSDO to your customer
base.
• TCXO-based to hold down costs, so not “state of the art” holdover
performance!
• USB interface for demo convenience.
 Demo Kit Contents:
• Board with USB interface & cable
• Antenna with cable
• Documentation: CDROM, Read-me sheet
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GPSDO Comparison
Product
GPS-1000
GPS-2000
GPS-2500
GPS-2550
GPS-2600
GPS-2650
GPS-2700
GPS-2750
CSAC-LP
OCXO
OCXO
OCXO
OCXO
CSAC
CSAC
1.0 x 2.5 x 0.5 in
1.5 x 3 x 0.65 in
1.5 x 3 x 0.8 in
1.5 x 4 x 0.8 in
2.5 x 3 x 0.7 in
2.0 X 2.5 X 0.7 in
Temp range
0°C to 60°C
0°C to 75°C
-25°C to 75°C
0°C to 75°C
-10°C to 70°C
-10ºC to 70ºC
Power 25°C
<1.4W
<3.2W
<4W
<4W
<1.4W
<0.55W
1.0E-11
with GPS
Lock
<6.0E-11
with GPS
Lock
<1.0E-11
with GPS
Lock
<1.0E-11
with GPS
Lock
<1.0E-10
with GPS
Lock
<1E-10
with GPS
Lock
-110dBc/Hz
-120dBc/Hz
-120dBc/Hz
-95dBc/Hz
-75dBc/Hz
-75dBc/Hz
Holdover
<+ 11 uS
3 hours
<+ 60 uS
24 hours
<+ 7 uS
24 hours
<+7 uS
24 hours
<+ 2 uS
24 hour
<+ 2 uS
24 hour
Outputs
1 PPS
10 MHz
1 PPS
2 & 10 MHz
1 GHZ
1 PPS
10 MHZ
1 PPS
10 MHz
100 MHz
1 PPS
10 MHz
1 PPS
10 MHz
GPS
L1
C/A 1574 MHz
L1
C/A 1574 MHz
L1
C/A 1574 MHz
L1
C/A 1574 MHz
L1
C/A 1574 MHz
L1
C/A 1574MHz
Technology
Size
ADEV 1s
Phase Noise
10Hz
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Thank You
Ramki Ramakrishnan
Director of Marketing, Clocks BU
ramki.ramakrishnan@microsemi.com
+1 707-636-1914
Paul R. Gerry
Senior Product Manager, Clocks BU
Paul.Gerry@microsemi.com
+1 978-522-5798
Steve Fossi
VP and General Manager, Clocks BU
Steve.Fossi@microsemi.com
+1 707-636-1810
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