The **ADE-R20** is a specialized high-performance frequency mixer manufactured by Mini-Circuits. It is widely used in radio frequency (RF) design for frequency up-conversion or down-conversion. --- ## 1. Technical Specifications The ADE-R20 is a **double-balanced mixer** based on Schottky diode technology. | Parameter | Specification | | :--- | :--- | | **Frequency Range (RF/LO)** | 10 MHz to 2000 MHz | | **Frequency Range (IF)** | DC to 1000 MHz | | **Conversion Loss** | 7.0 dB (Typical) | | **LO Drive Level** | Level 7 (+7 dBm) | | **Isolation (LO-RF)** | 35 dB (Typical) | | **Isolation (LO-IF)** | 32 dB (Typical) | | **Package Type** | Surface Mount (CD542) | --- ## 2. Internal Electronic Structure The device consists of two primary internal components: 1. **Matched Schottky Barrier Diodes:** Arranged in a bridge (ring) configuration to provide high linearity and broad bandwidth. 2. **Transmission Line Transformers:** Used at the input (RF/LO) and output (IF) ports to provide impedance matching (50 Ohms) and to convert single-ended signals to balanced signals. --- ## 3. Pin Configuration The ADE-R20 typically features a 6-pin surface mount layout. | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | **LO** | Local Oscillator input | | **2** | **GND** | Ground | | **3** | **RF** | Radio Frequency input/output | | **4** | **IF** | Intermediate Frequency output/input | | **5** | **GND** | Ground | | **6** | **GND** | Ground | --- ## 4. Key Electronic Characteristics * **Double Balanced Design:** This provides excellent isolation between the LO, RF, and IF ports. Because it is balanced, the LO signal is suppressed at the RF and IF outputs, reducing the need for heavy external filtering. * **Passive Component:** It does not require a DC bias (power supply) to operate. It derives its switching energy directly from the LO signal. * **Broadband Performance:** The use of ferrite-core transformers allows it to maintain consistent impedance and low loss across a very wide frequency spectrum (10MHz to 2GHz). --- ## 5. Typical Applications * **Cellular Infrastructure:** Used in base stations for signal processing. * **VHF/UHF Receivers:** For down-converting high-frequency signals to a lower IF for sampling. * **Instrumentation:** Signal generators and spectrum analyzers.