Narda-MITEQ Cryogenic LNA Selection Guide | 4K CLNA
What Is a Cryogenic Low Noise Amplifier?
A cryogenic low noise amplifier, or cryogenic LNA, is an RF amplifier designed to amplify extremely weak signals while operating at very low physical temperatures. Cooling the amplifier reduces the thermal noise generated by its active components, helping the receiving system achieve greater sensitivity than is normally possible with a room-temperature amplifier.
The Narda-MITEQ CLNA Series is specifically designed and qualified for operation down to 4 K. Current standard models cover frequencies from approximately 4 to 12 GHz, with minimum gain options from 25 to 40 dB and typical noise temperatures as low as 4 K for selected frequency bands.
Unlike a conventional room-temperature LNA, a cryogenic LNA must be selected according to both its RF performance and its effect on the cryogenic system. Noise temperature, DC power consumption, thermal load, biasing method, package materials and cable losses can be as important as gain and bandwidth.
Narda-MITEQ CLNA amplifiers are primarily intended for:
Quantum computing and quantum measurement
Radio astronomy
Deep-space communications
Satellite communications
Low-temperature physics
SIGINT and high-sensitivity receiving systems
Key Cryogenic LNA Selection Parameters
| Parameter | Why It Matters | How to Select |
|---|---|---|
| Frequency Range | The amplifier must cover the complete signal band without excessive gain or noise variation. | Select the narrowest standard CLNA band that fully covers the required operating frequencies. |
| Noise Temperature | Determines how much noise the amplifier adds to the cryogenic receiver chain. | Use the specified noise temperature at the intended operating temperature, normally 4 K. |
| Gain | Determines whether later-stage noise will significantly affect total receiver sensitivity. | Choose enough gain to overcome cable and room-temperature receiver losses without causing compression. |
| Gain Flatness | Affects channel-to-channel calibration and broadband signal accuracy. | Use a flatter-gain model for measurement, wideband and multichannel applications. |
| DC Power Consumption | Becomes a heat load that must be removed by the cryogenic cooling system. | Select the lowest-power version that still meets gain, noise and linearity requirements. |
| P1dB | Indicates the output level where amplifier gain begins to compress. | Check expected signal power, interference and calibration-tone levels against the minimum P1dB. |
| Input and Output VSWR | Affects signal transfer, standing waves and gain ripple in the cryogenic signal path. | Evaluate the LNA together with cables, isolators, filters and the connected device or antenna. |
| Bias Voltage and Current | Determines the electrical interface and the heat conducted through DC wiring. | Include bias-line losses, wire resistance and filtering at cryogenic temperature. |
| Operating Temperature | RF and DC performance can change with physical temperature. | Do not assume that a model specified at 4 K has the same performance at another cryogenic stage. |
| Connector and Bias Interface | Affects installation space, cable routing and serviceability. | Select the interface according to the cryostat layout and the latest model datasheet. |
| Package Material | Magnetic materials may interfere with sensitive quantum or scientific systems. | Specify a non-magnetic construction when required by the application. |
Narda-MITEQ CLNA Models and Specifications
The following values are based on Narda-MITEQ’s current CLNA product listing. Noise-temperature values are typical and should be confirmed against the latest model-specific datasheet.
| Model | Frequency | Gain Min. | P1dB Min. | Typical Noise Temperature |
|---|---|---|---|---|
| CLNA-30-0400-0800-5P-ND | 4–8 GHz | 30 dB | −5 dBm | 8 K |
| CLNA-40-0400-0800-5P-ND-DB | 4–8 GHz | 40 dB | −5 dBm | 4 K |
| CLNA-30-0400-1200-5P-ND | 4–12 GHz | 30 dB | −5 dBm | 6 K* |
| CLNA-25-0500-1000-5P | 5–10 GHz | 25 dB | −5 dBm | 6 K |
| CLNA-25-0500-1000-5P-ND | 5–10 GHz | 25 dB | −5 dBm | 6 K |
| CLNA-30-0500-1000-5P | 5–10 GHz | 30 dB | −5 dBm | 6 K |
| CLNA-30-0500-1000-5P-ND | 5–10 GHz | 30 dB | −5 dBm | 6 K |
| CLNA-40-0500-1000-5P | 5–10 GHz | 40 dB | −5 dBm | 6 K |
| CLNA-40-0500-1000-5P-ND | 5–10 GHz | 40 dB | −5 dBm | 6 K |
| CLNA-30-0600-0900-5P-ND-DB | 6–9 GHz | 30 dB | −5 dBm | 4 K |
| CLNA-40-0600-0900-5P-ND-DB | 6–9 GHz | 40 dB | −5 dBm | 4 K |
| CLNA-30-0800-1200-5P-ND | 8–12 GHz | 30 dB | −5 dBm | 8 K |
*For the CLNA-30-0400-1200-5P-ND, the model datasheet states a maximum noise temperature of 12 K below 5 GHz. Review the frequency-dependent noise curve when the application extends into the 4–5 GHz band.
Quick Model Comparison
| Requirement | Suggested CLNA Group | Selection Reason |
|---|---|---|
| Lowest listed typical noise temperature at 4–8 GHz | CLNA-40-0400-0800-5P-ND-DB | 40 dB gain and 4 K typical noise temperature |
| Broadest standard frequency coverage | CLNA-30-0400-1200-5P-ND | Covers 4–12 GHz with one amplifier |
| Lower gain for improved system headroom | CLNA-25-0500-1000-5P variants | 25 dB minimum gain across 5–10 GHz |
| Balanced gain for 5–10 GHz | CLNA-30-0500-1000-5P variants | 30 dB gain and 6 K typical noise temperature |
| High downstream-loss compensation | CLNA-40-0500-1000-5P variants | 40 dB minimum gain across 5–10 GHz |
| Optimized coverage for 6–9 GHz | CLNA-30/40-0600-0900-5P-ND-DB | 4 K typical noise temperature with 30 or 40 dB gain |
| X-band-focused receiving chain | CLNA-30-0800-1200-5P-ND | Covers 8–12 GHz with 30 dB gain |
CLNA vs. Related Narda-MITEQ LNA Families
| Series | Operating Environment | Main Selection Priority | Typical Applications |
|---|---|---|---|
| CLNA Cryogenic LNA | Cryogenic operation down to 4 K | Noise temperature and low DC heat load | Quantum computing, radio astronomy and low-temperature physics |
| ULNA Ultra-Low-Noise LNA | Primarily conventional system environments | Very low noise figure over broad RF bands | Radar, communications and test equipment |
| Standard Wideband LNA | General-purpose RF environments | Bandwidth, gain, noise figure and cost | Receivers, instrumentation and communication systems |
| SLNA Space LNA | Space-flight applications | Radiation, screening, reliability and mission qualification | Satellites, spacecraft and deep-space payloads |
Frequently Asked Questions
Can a Narda-MITEQ CLNA operate at 10 mK?
The standard CLNA models discussed here are specified for operation down to 4 K. A 4 K rating does not automatically qualify an amplifier for operation at 10 mK. In quantum systems, the LNA is generally installed at the 4 K stage. Contact DataStorageIC with the exact mounting temperature if operation below 4 K is required.
Should I choose a 30 dB or 40 dB cryogenic LNA?
Choose 40 dB when the amplifier must overcome significant downstream cable loss or room-temperature receiver noise. A 30 dB model may be preferable when lower DC power, greater system headroom or reduced compression risk is more important.
Is noise temperature more important than noise figure?
For cryogenic receivers, noise temperature is normally the more direct selection parameter. It should be evaluated at the amplifier’s actual physical temperature and across the complete operating frequency band.
What information is required to select the correct CLNA model?
At minimum, provide the frequency range, gain, maximum noise temperature, physical operating temperature, cooling capacity, P1dB, interface requirements and installation-space limitations.
Request Narda-MITEQ CLNA Selection Support
Selecting a cryogenic LNA requires more than matching frequency and gain. Noise temperature, DC heat load, physical mounting temperature, bias wiring, connector configuration and dynamic range must be evaluated as one system.
If you are comparing Narda-MITEQ CLNA models, please leave a message with your required frequency range, operating temperature, gain, noise-temperature target, available cooling power, interface type, quantity and target delivery date.
Contact DataStorageIC for Narda-MITEQ cryogenic LNA model selection, datasheets, pricing, availability and lead-time support.
