Analog Devices Inc. HMC8191-SX

Overview

HMC8191-SX from Analog Devices is a passive, wideband I/Q monolithic microwave integrated circuit (MMIC) mixer operating from 6 GHz to 26.5 GHz RF/LO and dc to 5 GHz IF. It functions as an image-rejecting downconverter or single-sideband upconverter, delivering 9.5 dB typical conversion loss, 29.5 dBc image rejection, and 12 dB typical single-sideband noise figure. It is used in high-frequency test instrumentation and military radar front-ends where wide instantaneous bandwidth and inherent sideband suppression are critical.

For engineers reviewing the HMC8191-SX datasheet, HMC8191-SX pinout, HMC8191-SX application, or HMC8191-SX equivalent, this device requires attention to its 7-pad chip-scale package, dc-coupled I/Q IF ports (IF1/IF2), LO/RF return loss performance (22.5 dB/12 dB typ), and absence of dc bias-making it suitable for low-noise, high-dynamic-range microwave signal chains without active power management overhead.

Technical Context

The HMC8191-SX implements a passive double-balanced I/Q architecture using GaAs MESFET process technology and an integrated 90° hybrid. Its operation relies on precise amplitude and phase balance (0.3 dB / 0.8° typ) between quadrature paths to achieve image rejection without external filtering.

It supports both high-side LO (lower sideband downconversion) and low-side LO (upper sideband downconversion) configurations, with verified performance across temperature (−40°C to +85°C) and LO drive levels (14–20 dBm). No dc power is required-performance is fully defined by RF/LO/IF port matching and external termination networks.

Key Specifications

Pinout & Package

The HMC8191-SX is supplied in a 7-pad bare-die CHIPS format (non-hermetic, no package body), requiring wire-bond or flip-chip mounting onto RF-optimized substrates. All pads are dc-coupled and 50 Ω matched when LO is active.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar I/Q mixer applications.

Compared with HMC1048LP4CE and QM11030, the HMC8191-SX uniquely delivers K-band coverage (up to 26.5 GHz) with passive operation and superior image rejection-making it the only choice for compact, high-frequency, zero-bias test and defense receivers demanding minimal external components.

Availability

HMC8191-SX is available at Aetrix Electronics and suitable for test instrumentation, military radar, and microwave point-to-point radio applications requiring stable component supply across extended temperature ranges and high-frequency performance consistency.

Supply support for HMC8191-SX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and RF ICs, serving precision instrumentation, communications, and defense markets since 1965.

The HMC8191-SX belongs to Analog Devices' Hittite Microwave MMIC product line, engineered specifically for broadband microwave signal conditioning in defense EW, radar, and high-speed test equipment where passive performance, wide bandwidth, and reliability are non-negotiable.

FAQ

What is the operating temperature range for the HMC8191-SX?

The HMC8191-SX is specified to operate from −40°C to +85°C ambient temperature. Performance parameters-including conversion loss, image rejection, and input IP3-are characterized across this full range per the datasheet's temperature sweeps (Figures 7–16, 17–26, etc.). Junction temperature must remain below 175°C under all conditions.

Does the HMC8191-SX require dc bias or external power?

No, the HMC8191-SX is a fully passive mixer fabricated in GaAs MESFET technology and requires no dc power supply. Its operation depends solely on proper RF, LO, and IF port terminations and matching networks. This eliminates bias sequencing, thermal drift from active devices, and associated noise contributions.

How is image rejection achieved in the HMC8191-SX?

Image rejection in the HMC8191-SX results from its monolithic I/Q architecture incorporating an integrated 90° hybrid and balanced mixer cells. Achieving 29.5 dBc typical rejection depends on maintaining tight amplitude balance (0.3 dB) and phase balance (0.8°) between IF1 and IF2 paths-both of which are process-controlled and verified across frequency and temperature.

Can the HMC8191-SX be used for upconversion?

Yes, the HMC8191-SX functions bidirectionally as both a downconverter and upconverter. In upconversion mode (e.g., IF = 100 MHz → RF = 6–26.5 GHz), it delivers 9.5 dB typical conversion loss and 26.5 dBc sideband rejection (Table 1, "RF PERFORMANCE AS UPCONVERTER"), supporting clean single-sideband transmit generation.

What are the absolute maximum ratings for RF, LO, and IF input power on the HMC8191-SX?

The HMC8191-SX has an absolute maximum input power rating of 24 dBm for RF, LO, and IF ports individually (Table 2). Exceeding this risks permanent damage. For reliable operation, Analog Devices recommends staying within the specified linear range-e.g., ≤15 dBm input P1dB for downconversion and ≤12 dBm for upconversion per Table 1.