DC–200 MHz Low-Noise Voltage Amplifier with Switchable Gain (20 डीबी / 40 डीबी) and Integrated Digital Attenuator
विषयसूची
अवलोकन
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.
विशेषताएं
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Wideband operation: DC to 200 मेगाहर्ट्ज
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Ultra-low input noise: Target 1.2 nV/√Hz
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Switchable gain levels: 20 डीबी (×10) तथा 40 डीबी (×100)
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को एकीकृत 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: मैं 1.8 एनएस
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50 Ω input and output impedance
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DC-coupled signal path
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एक +12 V power supply operation
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SMA connectors for RF signal input/output
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Compact modular architecture
विशेष विवरण
- कार्यकारी आवृति: DC ~ 200 मेगाहर्ट्ज
- Amplification Gain: 20 dB ~ 40 डीबी (customer configurable)
- In-Band Gain Flatness: ≤ ±0.5 dB
- Input/Output VSWR: मैं 1.5
- शोर का आंकड़ा: मैं 0.8 डीबी
- Attenuation Interface: Floating or grounded
- जमीन: no attenuation
- Floating: 20 dB attenuation
- कनेक्टर प्रकार: SMA-50KFD
- Input/Output Impedance: 50 ओह
- परिचालन तापमान: -10 ~ +70 सी
- बिजली की आपूर्ति: +8 वी ~ +17 वी
- चालू बिजली: मैं 150 एमए
Gain Adjustment and Attenuation Settings of the Low-Noise Amplifier Module
| 5 | 4 | 3 | 2 | 1 | Attenuation value (डीबी) |
| 0 | 0 | 0 | 0 | 0 | 31 |
| 0 | 0 | 0 | 0 | 1 | 30 |
| 0 | 0 | 0 | 1 | 0 | 29 |
| 0 | 0 | 0 | 1 | 1 | 28 |
| 0 | 0 | 1 | 0 | 0 | 27 |
| 0 | 0 | 1 | 0 | 1 | 26 |
| 0 | 0 | 1 | 1 | 0 | 25 |
| 0 | 0 | 1 | 1 | 1 | 24 |
| 0 | 1 | 0 | 0 | 0 | 23 |
| 0 | 1 | 0 | 0 | 1 | 22 |
| 0 | 1 | 0 | 1 | 0 | 21 |
| 0 | 1 | 0 | 1 | 1 | 20 |
| 0 | 1 | 1 | 0 | 0 | 19 |
| 0 | 1 | 1 | 0 | 1 | 18 |
| 0 | 1 | 1 | 1 | 0 | 17 |
| 0 | 1 | 1 | 1 | 1 | 16 |
| 1 | 0 | 0 | 0 | 0 | 15 |
| 1 | 0 | 0 | 0 | 1 | 14 |
| 1 | 0 | 0 | 1 | 0 | 13 |
| 1 | 0 | 0 | 1 | 1 | 12 |
| 1 | 0 | 1 | 0 | 0 | 11 |
| 1 | 0 | 1 | 0 | 1 | 10 |
| 1 | 0 | 1 | 1 | 0 | 9 |
| 1 | 0 | 1 | 1 | 1 | 8 |
| 1 | 1 | 0 | 0 | 0 | 7 |
| 1 | 1 | 0 | 0 | 1 | 6 |
| 1 | 1 | 0 | 1 | 0 | 5 |
| 1 | 1 | 0 | 1 | 1 | 4 |
| 1 | 1 | 1 | 0 | 0 | 3 |
| 1 | 1 | 1 | 0 | 1 | 2 |
| 1 | 1 | 1 | 1 | 0 | 1 |
| 1 | 1 | 1 | 1 | 1 | 0 |
ध्यान दें:
- 1 indicates the switch is ON.
- 0 is the OFF switch.
अनुप्रयोगों
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High-speed ADC front-end signal conditioning
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Wideband sensor signal amplification
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Oscilloscope and measurement system enhancement
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RF and IF broadband amplification
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Laboratory instrumentation
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Scientific research and physics experiments
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Low-level signal detection systems
सामान्य प्रश्न
क्यू: What is the digital interface of the 200 MHz amplifier?
ए: 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 डीबी.
This provides an easy way to toggle between gain states (जैसे, 20 dB and 40 डीबी) without requiring complex control circuitry.
Q1: Is the DC–200 MHz amplifier an operational amplifier or an RF low-noise amplifier?
ए: This product is an RF low-noise amplifier (LNA), not an operational amplifier. It is specifically designed for high-frequency signal amplification साथ में:
- 50 Ω input/output impedance
- SMA RF connectors
- Wide bandwidth from DC to 200 मेगाहर्ट्ज
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 डीबी / 40 डीबी) 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?
हाँ. The design includes a digitally controlled attenuator with 1 dB step resolution (तक 31 डीबी). This allows precise output level control and prevents ADC overdrive.
Q3: Is the amplifier fully DC-coupled?
हाँ. 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?
नहीं. The unit operates from a single +12 वोल्ट डीसी बिजली की आपूर्ति.
प्रश्न5: Are custom configurations available?
हाँ. Gain range, attenuation control method, enclosure type, and connector options can be customized based on your project requirements.
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