Powering Operational Amplifiers with a Triple Output DC Power Supply
Testing high-precision op-amps requires a clean, symmetric bipolar power supply (+Vcc and -Vee). Learn how a galvanically isolated triple output DC power supply simplifies mixed-signal design.
The Challenge of Op-Amp Power Supply Design
Operational amplifiers (op-amps) are the backbone of analog signal processing. To achieve maximum dynamic range and avoid clipping, most professional-grade op-amps require a symmetric bipolar power supply (e.g., +15V and -15V).
Using two separate single-channel power supplies is risky. If you adjust the positive rail but forget to adjust the negative rail identically, you introduce an offset voltage that can damage sensitive components or skew your sensor readings.
The Solution: Internal Series Tracking
- Single-Dial Control: In series tracking mode, CH1 becomes the master. Adjusting CH1 automatically adjusts CH2 to the exact same voltage, ensuring perfect symmetry.
- True Ground Reference: By connecting the positive terminal of CH2 to the negative terminal of CH1 (internally or externally), you create a true 0V common ground (COM) tap.
- Ultra-Low Ripple: Linear triple output supplies provide < 1mVrms ripple, essential for high-gain op-amp circuits where power supply noise is amplified.
Mixed-Signal Design: The Role of CH3
Modern PCBs rarely contain only analog components. An op-amp circuit is often paired with an ADC (Analog-to-Digital Converter) and a Microcontroller (MCU) or DSP.
This is where the Dedicated Digital Logic Channel (CH3) shines. While CH1 and CH2 provide the +/- 15V for the analog front-end, CH3 provides a rock-solid, isolated 3.3V or 5.0V for the digital logic. Because the channels are galvanically isolated, digital switching noise from the MCU will not couple into your sensitive analog ground plane.
Equip Your Lab for Mixed-Signal Testing
Stop fighting ground loops and mismatched voltage rails. Upgrade to a professional programmable triple output DC power supply.
Check Online Stock & Pricing