ADF4159
Recommended for New Designs
The ADF4159 is a 13 GHz, fractional-N frequency synthesizer with modulation and both fast and slow waveform generation capability. The part uses a 25-bit...
Datasheet
ADF4159 on Analog.com
HMC1161
Recommended for New Designs
The HMC1161 is a monolithic microwave integrated circuit (MMIC), voltage controlled oscillator (VCO) that integrates a resonator, a negative resistance...
Datasheet
HMC1161 on Analog.com
OP184
Production
The OP184/OP284/OP484 are single, dual and quad single-supply, 4 MHz bandwidth amplifiers featuring rail-to-rail inputs and outputs. They are guaranteed...
Datasheet
OP184 on Analog.com
We are currently using evaluation boards of ADF4159 along with HMC1161. We need to generate a sweep of 150 MHz with an Up Ramp of 8 ms and a Down ramp of 8 ms. We must also decrease the up and down ramp time to 125 us.
We need the recommended schematic loop filter settings for EVAL boards and register settings. We have tried from our end and the following is our observation.
We have observed that OP184 used in the Evaluation board switches voltage values between 12.8V and 0.036 V. We also need to add a delay between two consecutive ramps. We are unable to get the exact values that we have calculated. Also for 0 value and Delay enabled a delay of 1 ms is observed. Attaching the register values currently used as per ADF4159 Simulation software.
Following is the schematic with Loop filter details from ADISimPLL,
Also attaching the simulation file of ADF4159 simulation software below,
False True True False 500 1 0 0 0 3 0 0 256 0 0 0 True 0 0 0 0 0 0 0 0 0 0 1 0 0 7 False False 0 100 0 17500.0 8750.0 100 33554432 16777216 87 1 8750 1 0 0 0 25 0 1 0 0 0 7 0 0 0 0 0 0.000 0 0 0 0 0 0 0 128 8 1536 256 0 0 0 256 ABC123
Kindly provide us the recommended loop filter details with OP184 or whether AD8064 is recommended.
Overall can you please validate whether our approach is correct or if you can provide us with recommended settings for this specific application with ADF4159 and HMC1161?
We tried the schematic (Loop Filter) as provided by you for 8msec. We could not see the dwell time of 1 msec, and the spectrum response was also noisy. Just to elaborate on the setup, you can see the image, a separate board gives the Vr voltage for OpAmp and this value is hardly 0.1V but as per the datasheet, it should be 1.65V. If we increase the value then the ramp voltage increases abruptly to 12.8V, we also populated the 3.9pF shunt capacitor on HMC1161 Vtune input. We dumped the register file you provided as it is but the register file you shared is for 6GHz VCO RFout, can you please share the register file for frequency 8.75 GHz to 9 GHz triangular modulation? I wish to know whether we are making any mistakes in the setup and signaling scheme.
Thank you for the response, we will test as suggested, Regarding the Vp voltage that we are feeding from OPBAIS by removing R23 and R8, we have to manually and externally set it to 0.1V or less which as per the datasheet should be 1.65 fixed. May I know what do we miss?
