## Overview of the uPC1663B The **uPC1663B** is a high-frequency differential amplifier IC developed by NEC (now Renesas Electronics). It is specifically designed as a wideband video amplifier, typically used in high-resolution monitors, medical imaging, and communication equipment. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical characteristics of the uPC1663B: | Parameter | Specification | | :--- | :--- | | **Circuit Type** | Differential Input / Differential Output | | **Bandwidth (-3dB)** | 120 MHz (Typical) | | **Voltage Gain ($A_v$)** | 38 dB (Typical) | | **Supply Voltage ($V_{cc}$)** | $\pm$6 V or +12 V | | **Slew Rate** | 200 V/µs | | **Input Impedance** | 20 k$\Omega$ | | **Package Types** | 8-pin DIP or 8-pin SOP | --- ### 2. Functional Electronic Components The uPC1663B is not just a simple transistor; it is an Integrated Circuit (IC) consisting of several internal stages: 1. **Input Stage:** A differential pair that provides high input impedance and rejection of common-mode noise. 2. **Gain Stage:** Utilizes internal feedback to maintain a flat frequency response up to 120 MHz. 3. **Output Stage:** A low-impedance emitter follower stage capable of driving capacitive loads (like the cathode of a CRT or high-speed ADCs). 4. **Gain Adjustment:** It features specific pins for external gain control, allowing the user to fine-tune the amplification using an external resistor. --- ### 3. Pin Configuration | Pin Number | Symbol | Function | | :---: | :--- | :--- | | 1 | NC | No Connection | | 2 | IN- | Inverting Input | | 3 | IN+ | Non-inverting Input | | 4 | V- | Negative Power Supply (or Ground) | | 5 | OUT+ | Non-inverting Output | | 6 | OUT- | Inverting Output | | 7 | Gain | External Gain Adjustment | | 8 | V+ | Positive Power Supply | --- ### 4. Typical Application Circuit In a standard configuration, the uPC1663B is used to amplify low-level video signals before they reach the final driver stage. ```markdown Vcc (+6V) | [Capacitor] --- Pin 8 (V+) | Input Signal --- Pin 3 (IN+) Input Signal --- Pin 2 (IN-) | Pin 7 (Gain) --- [Resistor R_g] --- Ground (Controls Gain) | Output Signal -- Pin 5 (OUT+) Output Signal -- Pin 6 (OUT-) | [Capacitor] --- Pin 4 (V-) | Vee (-6V) ``` ### 5. Common Use Cases * **Video Preamplifiers:** Used in CRT monitors and high-end projectors. * **Pulse Amplifiers:** Suitable for high-speed pulse detection due to the 200 V/µs slew rate. * **Communications:** Used in IF (Intermediate Frequency) stages of radio receivers. ---