HMC8191 6–26.5GHz Wideband I/Q Mixer
Mfr. Part #: HMC8191LC4
Manufacturer: Analog Devices / Hittite Microwave
Product Type: Wideband GaAs MMIC I/Q Mixer
RF Frequency: 6GHz to 26.5GHz
LO Frequency: 6GHz to 26.5GHz
IF Frequency: DC to 5GHz
Typical LO Drive: 18dBm
Package/Case: 24-Terminal 4mm × 4mm Ceramic LCC
Lifecycle Status: Recommended for New Designs
Description: Passive wideband I/Q mixer for image-reject downconversion and single-sideband upconversion from 6GHz to 26.5GHz.
The HMC8191 from Analog Devices is a passive wideband I/Q MMIC mixer covering RF and LO frequencies from 6GHz to 26.5GHz. It can operate as an image-reject mixer in receiver designs or as a single-sideband upconverter in transmitter systems.
Its broad frequency coverage allows one HMC8191 to replace several narrowband mixers in multi-band microwave equipment. The passive GaAs MESFET design requires no DC power supply and provides high linearity, low conversion loss and strong isolation between RF, LO and IF ports.
Key Specifications
| Parameter | Typical Value |
|---|---|
| RF frequency | 6GHz to 26.5GHz |
| LO frequency | 6GHz to 26.5GHz |
| IF bandwidth | DC to 5GHz |
| LO drive level | 18dBm |
| Conversion loss | 9dB |
| Image rejection | 25dBc |
| SSB noise figure | 9dB |
| Downconverter input IP3 | 24dBm |
| Downconverter input P1dB | 15dBm |
| Input IP2 | 55dBm |
| LO-to-RF isolation | 40dB |
| LO-to-IF isolation | 40dB |
| RF-to-IF isolation | 20dB |
| Operating temperature | −40°C to +85°C |
Image-Reject Downconversion
When used as a downconverter, the HMC8191 converts a microwave RF input into quadrature IF outputs. Its I/Q architecture provides 25dBc typical image rejection, helping suppress unwanted image responses without requiring complex RF filtering.
The typical 24dBm input IP3 and 15dBm input P1dB support receiver designs that must handle strong input signals while maintaining good dynamic range.
Single-Sideband Upconversion
The HMC8191 can also operate as a single-sideband upconverter. Quadrature IF signals are mixed with the LO input to generate the selected upper or lower RF sideband.
Typical upconverter performance includes 9dB conversion loss, 25dBc sideband rejection, 22dBm input IP3 and 13dBm input P1dB.
External 90-Degree Hybrid Requirement
An external 90-degree hybrid is required at the IF ports for both upconversion and downconversion. The IF1 and IF2 connections determine whether the upper or lower sideband is selected.
The amplitude and phase performance of the external hybrid directly affects image rejection and sideband suppression. A hybrid covering the required IF bandwidth should be selected carefully.
Design Considerations
The RF, LO, IF1 and IF2 ports are DC-coupled. If operation down to DC is not required, external DC-blocking capacitors should be used.
Each IF port must not source or sink more than 3mA. The exposed pad and package ground pins must be connected to a low-inductance RF and DC ground.
Use controlled 50Ω transmission lines, short RF traces and sufficient grounding vias. At frequencies approaching 26.5GHz, connector launch, PCB material, trace geometry and component placement can significantly affect measured performance.
Applications
Test and measurement instrumentation
Microwave signal generators
Wideband receivers and transmitters
Military and defense systems
Aerospace RF equipment
Electronic warfare systems
Microwave point-to-point base stations
Multi-band frequency converters
Ordering Information
Available ordering versions include:
HMC8191LC4
HMC8191LC4TR
HMC8191LC4TR-R5
EV1HMC8191LC4 evaluation board
Related Products and Selection Support
View more Analog Devices and Hittite RF components, or use our ADI Hittite Mixer Selection Guide to compare I/Q mixers, fundamental mixers, conversion loss, frequency coverage and package options.
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