ELVA-1 series SPM provide the whole range frequency sources with internal and external controllable amplitude modulation. The standard model uses Cavity Stabilized IMPATT Diode Generators CIDO series as MMW signal source, and Voltage-Controlled Variable Attenuators VCVA series as an output power modulator. Voltage Controlled sweepers are available optionally on the base of Active Frequency Multipliers with 6-8 GHz pumping VCO or Voltage Controlled IMPATT Oscillator VCIO. Each model has built-in controllable signal generator for the output power modulation and a plug for an external modulation signal. We supply each device with a personal calibration characteristic for output power versus external control voltage. Typical dependence is shown in Fig. 1.
SPM devices can be produced with integrated power supplies. The block-diagram of the typical SPM device one can see on the Fig. 2.
external Modulation Input one can control the output power by means of
different power supplies, voltage generators and digital-analog converters
(DAC). DAC card for standard PC microcomputer with software is available
optionally. External modulation up to 20 kHz rate may be applied to switch
the attenuator between its high and low insertion loss states, or optionally
to vary the attenuation with the external voltage applied. The device
contains all the electronic circuitry and power supplies required to bias
the attenuator. Built-in Generator can be produced according customer
specification. Typical version provides sinusoidal modulation of output
power with 10 dB depth and modulation frequencies 0.02-12.5 kHz with a
correction of nonlinear characteristic of attenuation/voltage dependence.
Depth and frequency of modulation are controlled manually from the front
panel of the device.
AC Input Voltages: 110 V, 60Hz; 220 V, 50 Hz
Input Voltage for Variable Attenuation: 0 to +10 V
Switching Voltage for External Modulation: 0 to +5 V
How to Order:
XX- waveguide band (WR-Number)
A - flange type : R = round or S = square (WR-28 only)
B - operating frequency in GHz
C - output power in mW
D - AC voltage power supply options
0= no power supply 1 = 110 VAC/60Hz ,or 2 = 220 VAC/50Hz, or 3 = 100VAC/50Hz power supplies
Example: To order oscillator meets the following specification: waveguide WR-10, round flange, operation frequency 94 GHz, output power 20mW, input AC voltage 110ACV, should be ordered as SPM-10R-94-20-1