Transcript
COMPOSITE SIGNAL SUMMER SUM005 Features
General Description
The SUM005 is a multifunction VME card. Its primary function is to linearly sum four analog inputs and output the summed signal for Summation input, typically, to a Phase Modulator. An externally supplied ♦ System Reference Frequency “station-reference” Processor frequency is also processed • Automatic & Manual and distributed by this Reference Selection module. • Automatic. Seamless
♦ Four signal Linear
♦ ♦
Fail-Over 1 PPM Internal Reference Single Slot 6U VME Card
Signal Summer:
Each of four analog inputs is applied to a variable gain amplifier. The gains of these amplifiers are controlled from the VME bus. The gain for each signal is varied as required for the desired Modulation Index at the Phase Modulator. After being amplified to the desired levels, the signals are summed and output to the up-stream modulator. Frequency Reference: The SUM005 also houses circuits that provide a stable reference signal to be used by other modules in a system. An External Frequency Reference at either 5 or 10 MHz is connected to a Phase Locked Loop with a 1 ppm VCXO. The output of the VCXO is buffered and provided to other cards in the system that need a frequency reference. The level of the External Frequency Reference input is monitored for levels greater than 0.6 Vp-p and less than 0.3 Vp-p. A sync monitor is used to determine when the VCXO is phase locked to the External Frequency Reference. The AUTO or MANUAL mode IN 1 Gain may be selected for the Frequency IN 2 Gain Reference. In the AUTO mode, Unity Gain SUM OUT Summer when the Reference-Frequency IN 3 Gain input level is >0.6 Vp-p, the system uses the VCXO phaseIN 4 Gain locked to the Ext Freq. Ref. If the input level falls below 0.3 Vp-p, VME v the VCXO is allowed to free run. Interface In the Manual mode, with External Frequency Reference REF OUT 1 selected, if the input level is falls Internal/ External REF IN REF OUT 2 below 0.3 Vp-p, the system shuts Reference PLL down. V
V
V
V
VME BUS
Ref Clk Lock
Ref Clk
Ref Clk
REF OUT 3
V
300 Welsh Road · Building 3 · Horsham, PA 19044-2273 Phone: 215-657-5242 Fax: 215-657-5273
URL: http://www.gdpspace.com E-mail:
[email protected]
COMPOSITE SIGNAL SUMMER SUM005 SPECIFICATIONS SIGNAL INPUTS: Analog: [SMA Connector] 2 Vpp nominal Digital [SMA Connector] TTL Levels
External Reference Clock: [SMA Connector] 2.8 +/-1.5 Vpp sine wave SIGNAL OUTPUTS: Composite Output: [SMA Connector] The level of each input signal is independently adjustable from 0 to 2 Vpp. The composite output is a linear summation of the two signals. Reference Clock: [Three (3) SMA Connectors] Three buffered outputs at 10 MHz, TTL Levels Phase-Lock-Loop 1 ppm, stand-alone; or slaved to External Reference Clock
MISCELLANEOUS VME Bus: [A16:D8 Slave] Size: [VME 6U x 160 mm, single-slot width]
041028
Ordering Information SUM005-00 OPSUM5-10
Support:
Basic Function Dual Analog Inputs Recognizing that no standard product can meet all the needs of all users, GDP stands ready to provide units tailored to unique applications.
300 Welsh Road · Building 3 · Horsham, PA 19044-2273 Phone: 215-657-5242 Fax: 215-657-5273
URL: http://www.gdpspace.com E-mail:
[email protected]
