1GHz Oscillator Reference Clock Low Phase Noise RCLN1000 -136dBc/Hz @ 10kHz for DDS AD9910 AD9912
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1 GHz Fixed Frequency
Ultra-Low Phase Noise: -136 dBc/Hz @10 kHz
Excellent Spurious suppression: -85 dBc
Output Power: +4 dBm
Supply Voltage: 7.5 VDC
Supply Current: 200 mA
Operating Temperature: 0°C to +70°C
Frequency Stability (0-70°С): ±2 ppm (±2 kHz)
Stability per degree: 0.06 ppm/°C (57 Hz/°C)
Case Material: Aluminum
Dimensions: 95х50х40 mm
Weight: 300 g
Power Connector: 5.5×2.1 mm (+ in center)
RF Connector: SMA
Short description:
The output signal quality of a DSS (Direct Digital Synthesizer) dependent upon the Signal quality of the reference clock that is driving the DDS
This is why it is very important to select a low noise 1GHz clock source for the AD9910 and AD9912 DDS RF Units
It is essential to use the Ultra Low Noise Reference Oscillator get better performance than the PLL’s built-in frequency multiplier
Important quality aspects of the clock source, such as phase noise (in dBc/Hz) and frequency stability (in PPM) are reflected in the DDS Units output
Overview:
Model RCLN1000 v2.0 is an ultra-low phase noise 1 GHz clock oscillator, temperature compensated with true sinewave output.
Low cost, low phase noise, high temperature stability and excellent noise immunity performance due to the thick aluminum housing.
This makes this device an excellent choice over competing offerings.
Description:
The basis of this oscillator is a custom 200MHz VCXO (Voltage Controlled Crystal Oscillator) with low phase noise of -150 dBc @ 10kHz offset.
To stabilize the VCXO frequency over the entire operating temperature range, a TCXO is used with the application of feedback using PLL (Phase Locked Loop) technology.
To convert the stabilized frequency from 200 MHz to 1 GHz, a frequency multiplier by 5 is used.
And to suppress unwanted harmonics and subharmonics, a set of filters used.
They consisting of 2 sections of Helical Band Pass Filter (BPF), ceramic High Pass Filter (HPF) and Low Pass Filter (LPF) is used.
To amplify the output signal to the level of +4 dBm, a low-noise RF Monolithic Amplifier is installed between the BPF filters.
To reduce the mutual influence of internal blocks on each other, besides inter-block aluminum partitions, 4 separate power lines are used.
Each of these lines are stabilized by a low-dropout regulator (LDO) with low phase noise.
A thick-walled monolithic aluminum casing, made by milling, is used to shield the generator board.
Such a casing design is excellently shields the device from external sources of interference.
It is also significantly reduces electromagnetic emissions originating from the generator components.
Phase Noise:
To calculate the theoretical phase noise at the generator output (NFout), the following expression should be used:
NFout = NF_VCXO + 20log(Fout/Fin) + NF_amp + NF_other, where:
NF_VCXO – phase noise of the VCXO = -150 dBc/Hz @ 10 kHz offset
Fout – output frequency of the RCLN1000 = 1000 MHz
Fin – input frequency (from VCXO) = 200 MHz
That is, NFout = -150 + 20log(1000/200) ≈ -150 + 14 ≈ -136 dBc/Hz @ 10 kHz offset