HMC8191LC4TR-R5 datasheet(40/44 Pages) AD

40 / 44 page

HMC8191

Data Sheet

Rev. C | Page 40 of 44

THEORY OF OPERATION

The HMC8191 is a passive, wideband, I/Q MMIC mixer

that can be used either as an image reject mixer for receiver

operations, or as a single-sideband upconverter for transmitter

operations. With an RF and LO range of 6 GHz to 26.5 GHz,

and an IF bandwidth of dc to 5 GHz, the HMC8191 is ideal

for applications requiring wide frequency range, excellent RF

performance, and a simple design with fewer components and

a small PCB footprint. A single HMC8191 can replace multiple

narrow-band mixers in a design.

The inherent I/Q architecture of the HMC8191 offers excellent

image rejection and thereby eliminates the need for expensive

filtering for unwanted sidebands. The double balanced archi-

tecture of the mixer also provides excellent LO to RF isolation

and LO to IF isolation, and reduces the effect of LO leakage to

ensure signal integrity.

Because the HMC8191 is a passive mixer, the HMC8191 does

not require any dc power sources. It offers a lower noise figure

compared to an active mixer, ensuring superior dynamic range

for high performance and precision applications.

The HMC8191 is fabricated on a GaAs MESFET process and

uses Analog Devices mixer cells and a 90° hybrid. The

HMC8191 is available in a compact, 4 mm × 4 mm, 24-terminal

LCC package and operates over a −40°C to +85°C temperature

range. An evaluation board for the HMC8191 is also available

from the Analog Devices website.

For both upconversion and downconversion, an external 90°

hybrid is required. See the Applications Information section for

details to interface with an external 90° hybrid.

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