The **PE9145DEV** is a high-performance, radiation-hardened (RadHard) digital step attenuator (DSA) evaluation kit manufactured by **pSemi** (a Murata company). This device is specifically engineered for aerospace, defense, and satellite communication systems where reliability in harsh environments is critical. --- ### 1. Technical Specifications The PE9145 (the core IC on the evaluation board) is a 6-bit digital step attenuator. | Feature | Specification | | :--- | :--- | | **Frequency Range** | 9 kHz to 18 GHz | | **Attenuation Range** | 31.5 dB | | **Step Size** | 0.5 dB | | **Insertion Loss** | ~2.5 dB @ 12 GHz | | **Control Interface** | Parallel and Serial (SPI) | | **Operating Voltage** | 2.3V to 5.5V | | **Package** | 32-lead CQFP (Hermetic) | --- ### 2. Core Electronic Components The evaluation board (DEV kit) consists of several key functional blocks: #### A. The PE9145 IC The heart of the board is the UltraCMOS® monolithic 6-bit attenuator. It uses an integrated high-frequency switch network to bypass or engage resistive elements to achieve the desired signal reduction. #### B. RF Connectors * **SMA/K-Connectors:** The board typically uses high-frequency SMA or 2.92mm connectors for the RF Input and RF Output to ensure impedance matching (50 Ohms) and minimal signal reflection. #### C. Control & Interface Circuitry * **Level Shifters:** Often included to bridge the gap between standard lab microcontrollers (3.3V/5V) and the specific logic thresholds of the RadHard IC. * **Decoupling Capacitors:** Strategically placed near the $V_{DD}$ pins to filter power supply noise and provide local energy storage for high-speed switching. #### D. Radiation Hardening Features The electronic architecture is designed to withstand: * **TID (Total Ionizing Dose):** Usually rated up to 100 krad (Si). * **SEE (Single Event Effects):** Immune to latch-up (SEL) due to the UltraCMOS (Silicon on Insulator) substrate. --- ### 3. Functional Operation The PE9145DEV allows engineers to test two primary modes: 1. **Serial Mode:** Data is clocked into an internal shift register. This is ideal for saving pin counts on a flight computer. 2. **Parallel Mode:** Each bit of attenuation is controlled by a dedicated pin. This allows for near-instantaneous state changes (high-speed switching). --- ### 4. Typical Applications * **Satellite Payloads:** Controlling signal gain in transponders. * **Phased Array Antennas:** Beamforming and signal leveling. * **Radar Systems:** Precision pulse modulation and gain control.