Підсилювач напруги з низьким рівнем шуму DC–200 МГц із перемиканням посилення (20 дБ / 40 дБ) і вбудований цифровий аттенюатор
Зміст
Overview
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:
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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.
риси
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Wideband operation: DC to 200 МГц
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Ultra-low input noise: Target 1.2 nV/√Hz
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Switchable gain levels: 20 дБ (×10) і 40 дБ (×100)
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Інтегрований 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 нс
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50 Ω input and output impedance
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DC-coupled signal path
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неодружений +12 V power supply operation
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SMA connectors for RF signal input/output
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Compact modular architecture
Specifications
- Operating Frequency: DC ~ 200 МГц
- Amplification Gain: 20 dB ~ 40 дБ (customer configurable)
- In-Band Gain Flatness: ≤ ±0.5 dB
- Input/Output VSWR: ≤ 1.5
- Фігура шуму: ≤ 0.8 дБ
- Attenuation Interface: Floating or grounded
- Grounded: no attenuation
- Floating: 20 dB attenuation
- Тип роз'єму: СМА-50КФД
- Input/Output Impedance: 50 ох
- Operating Temperature: -10 ~ +70 °C
- Power Supply: +8 V ~ +17 V
- Operating Current: ≤ 150 мА
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 |
Примітка:
- 1 indicates the switch is ON.
- 0 is the OFF switch.
вага & вимір
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
часто задаються
Q: What is the digital interface of the 200 MHz amplifier?
A: 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 дБ.
This provides an easy way to toggle between gain states (напр., 20 dB and 40 дБ) without requiring complex control circuitry.
Q1: Is the DC–200 MHz amplifier an operational amplifier or an RF low-noise amplifier?
A: This product is an RF low-noise amplifier (LNA), not an operational amplifier. It is specifically designed for high-frequency signal amplification з:
- 50 Ω input/output impedance
- SMA RF connectors
- Wide bandwidth from DC to 200 МГц
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 дБ / 40 дБ) 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?
Так. The design includes a digitally controlled attenuator with 1 dB step resolution (до 31 дБ). This allows precise output level control and prevents ADC overdrive.
Q3: Is the amplifier fully DC-coupled?
Так. 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?
Немає. The unit operates from a single +12 В джерело живлення постійного струму.
Q5: Are custom configurations available?
Так. 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. The build quality feels solid, 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.