具有可切换增益的 DC–200 MHz 低噪声电压放大器 (20 分贝 / 40 分贝) 和集成数字衰减器

具有可切换增益的 DC–200 MHz 低噪声电压放大器 (20 分贝 / 40 分贝) 和集成数字衰减器

概观

The DC–200 MHz Low-Noise Voltage Amplifier is a custom-built, high-performance signal conditioning solution designed for ultra-low noise and wideband applications. The system integrates a high-gain low-noise amplifier (LNA) and a digitally controlled attenuator, providing flexible gain control while maintaining excellent signal integrity.

The design consists of two core modules:

• 43 dB Low-Noise Amplifier (DC–200 MHz bandwidth)

• 31 dB Digitally Controlled Attenuator (1 dB step resolution)

The amplifier provides a default 40 dB gain configuration, with internal 20 dB attenuation capability and additional programmable output attenuation. This ensures compatibility with sensitive ADC inputs and prevents saturation by allowing precise signal level adjustment.

Designed for laboratory, instrumentation, and high-speed data acquisition systems, the amplifier operates from a single +12 V supply and features 50 Ω input/output impedance with DC coupling throughout the signal path.

特征

• Wideband operation: DC to 200 兆赫

• Ultra-low input noise: Target 1.2 nV/√Hz

• Switchable gain levels: 20 分贝 (×10) 和 40 分贝 (×100)

• 集成 31 dB digitally controlled attenuator (1 dB step)

• Internal attenuation option for gain flexibility

• Fast rise/fall time: ≤ 1.8 NS

• 50 Ω input and output impedance

• DC-coupled signal path

• 单 +12 V power supply operation

• SMA connectors for RF signal input/output

• Compact modular architecture

产品规格

应用

• High-speed ADC front-end signal conditioning

• Wideband sensor signal amplification

• Oscilloscope and measurement system enhancement

• RF and IF broadband amplification

• Laboratory instrumentation

• Scientific research and physics experiments

• Low-level signal detection systems

常问问题

Q: What is the digital interface of the 200 MHz amplifier?
一个: The amplifier includes a simple digital control input used to switch attenuation levels.

• When the control pin is left floating, the amplifier operates at full gain.
• When the control pin is connected to ground, the signal is attenuated by 20 分贝.

This provides an easy way to toggle between gain states (例如, 20 dB and 40 分贝) without requiring complex control circuitry.

Q1: Is the DC–200 MHz amplifier an operational amplifier or an RF low-noise amplifier?
一个: This product is an RF low-noise amplifier (LNA), not an operational amplifier. It is specifically designed for high-frequency signal amplification 同:

• 50 Ω input/output impedance
• SMA 射频连接器
• Wide bandwidth from DC to 200 兆赫

Unlike operational amplifiers, which are typically used in low-frequency analog circuits, this amplifier is optimized for RF and high-speed signal applications such as measurement systems and signal conditioning.

Q1: How is the gain switched?
The amplifier supports switchable gain (20 分贝 / 40 分贝) via internal configuration. Gain control can be implemented using hardware switching or digital attenuation depending on system requirements.

Q2: Can the output be attenuated to prevent ADC saturation?
是. The design includes a digitally controlled attenuator with 1 dB step resolution (取决于 31 分贝). This allows precise output level control and prevents ADC overdrive.

Q3: Is the amplifier fully DC-coupled?
是. The signal path is DC-coupled from input to output, making it suitable for applications requiring low-frequency or DC signal amplification.

Q4: Does it require dual power supplies?
没有. The unit operates from a single +12 V DC电源.

Q5: Are custom configurations available?
是. Gain range, attenuation control method, enclosure type, and connector options can be customized based on your project requirements.