The Keysight (Agilent) 87405A is a compact, high-performance preamplifier operating from 10 MHz to 3 GHz. It offers a minimum gain of 22 dB and a typical noise figure of 6.5 dB up to 2 GHz, making it an excellent front-end accessory for spectrum analyzers and noise figure measurement solutions. With an insertable Type-N connector configuration, it is highly optimized for test port applications.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | 3-pin probe-power bias connector |
Physical
| Parameter | Value |
|---|---|
| Power Supply | +15 VDC @ 80 mA (via probe-power cable) |
| Operating Temperature | 0 to 55 °C |
| Dimensions (W×H×D) | 45 mm × 22 mm × 115 mm |
Frequency & Gain
| Parameter | Value |
|---|---|
| Frequency Range | 0.01 to 3 GHz |
| Minimum Gain | 22 dB |
Noise & Distortion
| Parameter | Value |
|---|---|
| Noise Figure (0.01 to 2 GHz) | < 6.5 dB |
| Noise Figure (2 to 3 GHz) | < 7.5 dB |
Signal Limits
| Parameter | Value |
|---|---|
| Output Power at 1dB Compression | +8 dBm (minimum) |
Connectors
| Parameter | Value |
|---|---|
| RF Input Connector | Type-N (male) |
| RF Output Connector | Type-N (female) |
| Bias Power Connector | 3-pin probe power |
Power Requirements
| Parameter | Value |
|---|---|
| DC Supply Voltage | +15 V |
| DC Current Consumption | 80 mA |
| Bias Regulation | Integral bias regulation |
Impedance & Port Characteristics
| Parameter | Value |
|---|---|
| Nominal Impedance | 50 Ω |
System Compatibility
| Parameter | Value |
|---|---|
| Recommended Compatibility | Keysight/Agilent 8590E series portable spectrum analyzers, 8594E Noise Figure Measurement Solution |
Performance
| Parameter | Value |
|---|---|
| Input SWR (0.01 to 2 GHz) | < 1.5 |
| Input SWR (2 to 3 GHz) | < 1.8 |
| Output SWR (0.01 to 2 GHz) | < 1.5 |
| Output SWR (2 to 3 GHz) | < 1.8 |
| Gain Flatness | ±1.5 dB |
| Typical Gain | 24 dB |
| Third-order Intercept Point (IP3) | +20 dBm (typical) |
| Maximum RF Input Power | +13 dBm |
| Maximum DC Input Voltage | ±20 V |
| Reverse Isolation | > 30 dB |
| Harmonics | -30 dBc (typical @ +4 dBm output) |
Environmental
| Parameter | Value |
|---|---|
| Storage Temperature | -40 to +75 °C |
Technology
Solid State Preamplifier
Applications
Test port preamplification, noise figure measurements, spectrum analyzer front-end enhancement