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
目录
概述
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 (低噪声放大器) and a digitally controlled attenuator, providing flexible gain control while maintaining excellent signal integrity.
The design consists of two core modules:
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43 dB Low-Noise Amplifier (DC–200 MHz bandwidth)
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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
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Wideband operation: DC to 200 兆赫
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Ultra-low input noise: 目标 1.2 nV/√Hz
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Switchable gain levels: 20 分贝 (×10) 和 40 分贝 (×100)
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融合的 31 dB digitally controlled attenuator (1 dB step)
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Internal attenuation option for gain flexibility
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Fast rise/fall time: ≤ 1.8 纳秒
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50 Ω input and output impedance
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DC-coupled signal path
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单身的 +12 V power supply operation
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SMA connectors for RF signal input/output
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Compact modular architecture
产品规格
- 工作频率: DC ~ 200 兆赫
- Amplification Gain: 20 dB ~ 40 分贝 (customer configurable)
- In-Band Gain Flatness: ≤±0.5分贝
- Input/Output VSWR: ≤ 1.5
- 噪声系数: ≤ 0.8 分贝
- Attenuation Interface: Floating or grounded
- 接地: no attenuation
- 漂浮的: 20 分贝衰减
- 连接器类型: SMA-50KFD
- 输入/输出阻抗: 50 Ω
- 工作温度: -10 ～ +70 ℃
- 电源: +8 伏〜 +17 V
- 工作电流: ≤ 150 毫安
Gain Adjustment and Attenuation Settings of the Low-Noise Amplifier Module
| 1 | 2 | 3 | 4 | 5 | Attenuation value（dB） |
| 1 | 1 | 1 | 1 | 1 | 0 |
| 0 | 1 | 1 | 1 | 1 | 1 |
| 1 | 0 | 1 | 1 | 1 | 2 |
| 0 | 0 | 1 | 1 | 1 | 3 |
| 1 | 1 | 0 | 1 | 1 | 4 |
| 0 | 1 | 0 | 1 | 1 | 5 |
| 1 | 0 | 0 | 1 | 1 | 6 |
| 0 | 0 | 0 | 1 | 1 | 7 |
| 1 | 1 | 1 | 0 | 1 | 8 |
| 0 | 1 | 1 | 0 | 1 | 9 |
| 1 | 0 | 1 | 0 | 1 | 10 |
| 0 | 0 | 1 | 0 | 1 | 11 |
| 1 | 0 | 1 | 0 | 1 | 12 |
| 0 | 0 | 1 | 0 | 1 | 13 |
| 1 | 0 | 0 | 0 | 1 | 14 |
| 0 | 0 | 0 | 0 | 1 | 15 |
| 1 | 1 | 1 | 1 | 0 | 16 |
| 0 | 1 | 1 | 1 | 0 | 17 |
| 1 | 0 | 1 | 1 | 0 | 18 |
| 0 | 0 | 1 | 1 | 0 | 19 |
| 1 | 1 | 0 | 1 | 0 | 20 |
| 0 | 1 | 0 | 1 | 0 | 21 |
| 1 | 0 | 0 | 1 | 0 | 22 |
| 0 | 0 | 0 | 1 | 0 | 23 |
| 1 | 1 | 1 | 0 | 0 | 24 |
| 0 | 1 | 1 | 0 | 0 | 25 |
| 1 | 0 | 1 | 0 | 0 | 26 |
| 0 | 0 | 1 | 0 | 0 | 27 |
| 1 | 1 | 0 | 0 | 0 | 28 |
| 0 | 1 | 0 | 0 | 0 | 29 |
| 1 | 0 | 0 | 0 | 0 | 30 |
| 0 | 0 | 0 | 0 | 0 | 31 |
注意:
- 1 indicates the switch is ON.
- 0 is the OFF switch.
重量 & 尺寸
Applications
- 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 (低噪声放大器), not an operational amplifier. It is specifically designed for high-frequency signal amplification 和:
- 50 Ω 输入/输出阻抗
- 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 (最多 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.
第四季度: Does it require dual power supplies?
没有. The unit operates from a single +12 V直流电源.
Q5: Are custom configurations available?
是. Gain range, attenuation control method, enclosure type, and connector options can be customized based on your project requirements.
iVcan.com –
I’ve been using this DC–200 MHz Low-Noise Voltage Amplifier in my lab setup, and it has exceeded my expectations in both performance and flexibility. The signal clarity is excellent, with very low noise even at higher gain settings. I especially appreciate the switchable gain and the integrated digital attenuator, which make it easy to fine-tune signal levels without additional hardware. 构建质量感觉很扎实, and the SMA interfaces ensure reliable connections. It integrates seamlessly with my ADC system and measurement equipment. Overall, it’s a highly reliable and versatile amplifier for precision applications.