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— | eval:hmc8362_user_guide [10 Aug 2020 19:20] – Final Edits Kieran Barrett | ||
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+ | ====== EV1HMC8362LP6G/ | ||
+ | ====Evaluating the HMC8362/ | ||
+ | ====Features==== | ||
+ | * Self contained board, Including [[adi> | ||
+ | * [[adi> | ||
+ | * Filtering options, | ||
+ | * [[adi> | ||
+ | * Header connectivity to allow use of Arduino Uno or Linduino microcontroller | ||
+ | * Externally powered by a single 6.0 V supply | ||
+ | ====Evaluation Kit Contents==== | ||
+ | EV1HMC8362LP6G or | ||
+ | EV1HMC8364LP6G evaluation board | ||
+ | |||
+ | ====Equipment Needed==== | ||
+ | * Power supply (6 V) | ||
+ | * Power supply (low noise, variable 0 V to 13.5 V) | ||
+ | * 50 Ω terminations | ||
+ | * Signal source analyzer | ||
+ | |||
+ | ====Online Resources==== | ||
+ | * [[adi> | ||
+ | * [[adi> | ||
+ | * Linduino DC2026C Demo Manual | ||
+ | |||
+ | ====General Description==== | ||
+ | The EV1HMC8362LP6G and EV1HMC8364LP6G allow the evaluation of the performance of the [[adi> | ||
+ | Consult the [[adi> | ||
+ | |||
+ | ====EV1HMC8362LP6G/ | ||
+ | {{ : | ||
+ | Figure 1. Evaluation Board | ||
+ | |||
+ | ====GETTING STARTED==== | ||
+ | ===EVALUATION BOARD SETUP PROCEDURE=== | ||
+ | To configure the EV1HMC8362LP6G or EV1HMC8364LP6G for the first time, perform the following steps. | ||
+ | - Verify that the analog power supply that is used to power the evaluation board configured to allow an output of 6.0 V and 200 mA of compliance current. | ||
+ | - Disable the power supply output. | ||
+ | - Using a double shielded BNC cable and a BNC to SMA adapter, connect the analog power supply to J1. | ||
+ | - Use the supplied shorting jumpers to configure the logic, as shown in Figure 2. In the configuration shown in Figure 2, the [[adi> | ||
+ | - Connect the low noise, variable power supply to the SMA connector on the tuning port (J2) using a double shielded BNC cable and a BNC to SMA adapter. Torque this connection to 8 in/lb using an SMA torque wrench. | ||
+ | - Connect a 50 Ω RF cable capable of mating to the 2.92 mm K connector at J3 and torque this connection to 8 in/lb. Connect the other end of the cable to a signal source analyzer. | ||
+ | - Enable the 6 V power supply. Approximately 103 mA is drawn if the part is configured correctly. | ||
+ | - Enable the variable power supply and adjust the tuning voltage to within the range of the VCO band being used. | ||
+ | - Verify that the correct output frequency is observed on the signal source analyzer. An example using the [[adi> | ||
+ | {{ : | ||
+ | Figure 2. Connector P1 Jumper Configuration: | ||
+ | ====EVALUATION BOARD HARDWARE==== | ||
+ | The EV1HMC8362LP6G and EV1HMC8364LP6G are identical except for Resistor R6, which sets the current limit function of the [[adi> | ||
+ | The evaluation board schematics, assembly, silkscreen, and bill of materials are available in the Evaluation Board Schematics and Artwork section and Ordering Information section. The gerber fabrication files are available on the [[adi> | ||
+ | |||
+ | ===POWER SUPPLIES=== | ||
+ | The EV1HMC8362LP6G and EV1HMC8364LP6G boards are powered by a 6 V dc (150 mA) power supply connected to the SMA connector J1 labeled 6.0 V. This supply path includes a single ultralow noise, (LDO) regulator, the [[adi> | ||
+ | Users that intend to use an external power supply such as the Linduino® or Arduino® Uno microcontroller to directly program the logic from the P3 header must remove the five 10 kΩ resistors (R18, R26, R35, R36, and R37) or damage may occur. | ||
+ | A second low noise power supply cable providing up to 13.5 V is required to tune the VCOs. Use of a noisy power supply on the tuning port results in narrow-band FM modulation and sidebands. | ||
+ | |||
+ | ===VOLTAGE CONTROLLED OSCILLATOR (VCO)=== | ||
+ | The [[adi> | ||
+ | By generating fundamental frequencies, | ||
+ | The oscillator cores must be selected, one at a time, depending on the frequency range required at any point in time by the application. The VCO cores are selected by simply enabling the supply voltage at its respective bias pin (VC1 through VC4). The EV1HMC8362LP6G and EV1HMC8364LP6G boards accomplish this VCO core selection through the use of the [[adi> | ||
+ | The EV1HMC8362LP6G and EV1HMC8364LP6G boards include additional filtering to prevent supply voltage overshoot and undershoot, which can damage the device if overshoot exceeds 5.5 V. This filtering provides 5 V of biasing that settles within about 1 µs. | ||
+ | |||
+ | ===BUFFER AMPLIFIER=== | ||
+ | The buffer amplifier used in the [[adi> | ||
+ | Refer to the [[adi> | ||
+ | Users can opt to leave the VCO enabled and power down Pin 8 (VCB) to mute the output signal, which leaves the lower stage of the cascode enabled. However, because the upper circuitry is disabled, RF is not routed to the output. | ||
+ | Figure 5 shows the [[adi> | ||
+ | For additional details on the buffer amplifier circuitry, consult the [[adi> | ||
+ | |||
+ | ===RF OUTPUT=== | ||
+ | The EV1HMC8362LP6G and EV1HMC8364LP6G boards have a single RF output port (RF1). RF1 is supplied by a buffer amplifier that is common to all four VCO cores. | ||
+ | RF1 (J3) is a single-ended RF output that operates up to 26.6 GHz. The actual frequency range and power level at any given time depends on which model is being evaluated and the VCO core that is enabled. Consult the [[adi> | ||
+ | |||
+ | ===LOOP FILTER=== | ||
+ | Although the EV1HMC8362LP6G and EV1HMC8364LP6G boards do not incorporate the entire loop filter, they do provide the means to filter noise that may appear on the tuning port when evaluating only the VCOs. | ||
+ | By default, a 100 pF capacitor (C12) is placed near Pin 27 (VTUNE) of the [[adi> | ||
+ | The EV1HMC8362LP6G and EV1HMC8364LP6G boards also include placements for the last pole of a loop filter on the tuning port path for use when configuring the [[adi> | ||
+ | Due to the increased length of the loop filter path that typically occurs when using evaluation boards to build a synthesizer, | ||
+ | The tuning voltage requirements of the [[adi> | ||
+ | SMA Connector J2 provides means to connect the PLL CP output to the tuning port (VTUNE) when the EV1HMC8362LP6G and EV1HMC8364LP6G are used with an optional PLL evaluation board. J2 can also be used to manually tune the VCO within its band when evaluating the open-loop VCO performance. | ||
+ | |||
+ | ===DEFAULT CONFIGURATION=== | ||
+ | All components necessary for local oscillator generation are inserted on the EV1HMC8362LP6G and EV1HMC8364LP6G boards. | ||
+ | |||
+ | ====EVALUATION BOARD SOFTWARE==== | ||
+ | ===SOFTWARE=== | ||
+ | Currently there is no software available for the EV1HMC8362LP6G and EV1HMC8364LP6G because they can be evaluated without the use of software. However, the EV1HMC8362LP6G and EV1HMC8364LP6G are configured in a manner that allows use of a Linduino, Arduino Uno, or similar microcontroller board, which may be beneficial for users needing to develop and test switching algorithms for their application. | ||
+ | To connect the Arduino Uno microcontroller to the EV1HMC8362LP6G or EV1HMC8364LP6G, | ||
+ | |||
+ | ====EVALUATION AND TEST==== | ||
+ | To configure the EV1HMC8362LP6G and EV1HMC8364LP6G for the first time, follow Step 1 through Step 6 outlined in the Evaluation Board Setup Procedure section. | ||
+ | The frequency vs. tune voltage listed in the following steps are specific to the EV1HMC8362LP6G, | ||
+ | - Enable the variable power supply and adjust the tuning voltage to 8.45 V. | ||
+ | - If the EV1HMC8362LP6G is configured correctly, a signal at approximately 13.5 GHz with approximately 0 dBm to 2 dBm of output power appears on a spectrum analyzer or signal source analyzer. Refer to Figure 4. | ||
+ | - Remove the bias for the buffer amplifier (VCB), which results in the output power decreasing by approximately 28 dBm. Refer to Figure 5. | ||
+ | - Finally, use the signal source analyzer to measure the phase noise. Refer to Figure 6. | ||
+ | {{ : | ||
+ | Figure 3. EV1HMC8362LP6G, | ||
+ | |||
+ | {{ : | ||
+ | Figure 4. EV1HMC8362LP6G, | ||
+ | |||
+ | {{ : | ||
+ | Figure 5. EV1HMC8362LP6G Phase Noise at RF1, VCO Band 1, VTUNE = 8.45 V, 13.5 GHz | ||
+ | |||
+ | ====Schematics, | ||
+ | ====EV1HMC8362LP6G==== | ||
+ | * {{ : | ||
+ | * {{ : | ||
+ | |||
+ | ====EV1HMC8364LP6G==== | ||
+ | * {{ : | ||
+ | * {{ : |