Millimeter-Wave Integrated Circuit Design

Millimetre-wave integrated circuit design encompasses the creation of active and passive microelectronic components that operate across the 30–300 GHz spectrum. Such circuits are pivotal for next-generation wireless communication, high-resolution radar, satellite links and passive imaging systems. Designers must confront elevated conductor and dielectric losses, stringent electromagnetic coupling and the shrinking tolerances of on-chip passives. Diverse material platforms—including indium phosphide (InP), gallium arsenide (GaAs) and advanced CMOS—offer trade-offs between noise performance, integration density and cost. Key building blocks such as low-noise amplifiers, mixers, oscillators and phase shifters require co-optimisation of transistor device models, transmission-line layouts and matching networks. Recent trends emphasise broadband and multi-band topologies, novel feedback and compensation schemes, and on-chip local oscillator distribution to minimise external interconnects. Through refined electromagnetic simulation, compact passive structures and advanced fabrication techniques, engineers continue to push the limits of frequency coverage, sensitivity and power efficiency, enabling a host of emerging applications from 6G base stations to automotive sensing.

Research from Nature Portfolio

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Research from all publishers

Recent developments in III-V technology have demonstrated an indium phosphide HBT mixer module achieving a record 150 GHz RF bandwidth. By employing a common-mode-gain-boosted differential pair and phase-offset local-oscillator drive, the wideband design sustains a nearly flat conversion gain across DC to 150 GHz, representing the broadest direct-conversion bandwidth reported to date.

A gallium arsenide pHEMT receiver front-end for V-band passive imaging integrates a low-noise amplifier, image-reject mixer and multiply-by-four local-oscillator chain on a single chip. With only one 3 V supply, the front-end delivers around –3 dB conversion gain, a 7 dB noise figure and over 25 dB image rejection between 52 and 56 GHz, while maintaining low LO drive and offering full 360° phase control for enhanced imaging fidelity.

In the CMOS domain, a 130 nm cascode mixer employing distributed amplifying cells with inductive positive feedback exhibits broad coverage from 4 to 30 GHz and from 54 to 66 GHz. The design achieves conversion gain between –2.9 and +3.1 dB, LO-RF isolation above 15 dB, and a total power consumption of under 12 mW, all within a compact 0.056 mm² footprint suited to multi-band transceiver integration.

Millimeter-Wave Integrated Circuit Design publication trend

The graph below shows the total number of articles in millimeter-wave integrated circuit design across all publications each year (not limited to Nature Index journals).

Technical terms

Millimetre-wave: The electromagnetic spectrum from 30 to 300 GHz, corresponding to wavelengths of 1–10 mm, used for high-capacity communication and imaging.

Mixer: A nonlinear circuit that combines or translates signal frequencies via multiplication of a radio-frequency input with a local-oscillator input to produce sum and difference outputs.

Conversion gain: The ratio of output intermediate-frequency or radio-frequency power to input radio-frequency power in a mixer, often expressed in decibels.

Noise figure: A metric indicating the degradation of signal-to-noise ratio caused by a circuit, defined as the ratio of input to output signal-to-noise ratios.

Balun: A passive network that converts between balanced and unbalanced transmission lines, commonly used for mixer and antenna interfaces.

Heterojunction bipolar transistor (HBT): A high-speed bipolar transistor formed by joining semiconductor materials with differing bandgaps to enhance carrier injection.

pHEMT: A pseudomorphic high-electron-mobility transistor that employs strained semiconductor layers to achieve high electron mobility and low noise at microwave frequencies.

CMOS: Complementary metal-oxide-semiconductor technology, a mainstream silicon-based process offering high integration density and low cost for mixed-signal circuits.

References

1. DC-to-150 GHz Bandwidth InP HBT Mixer Module With Upper-Sideband Gain-Enhancing Function. IEEE Transactions on Microwave Theory and Techniques (2024).
2. A V-Band Integrated Receiver Front-End Based on 0.15 μm GaAs pHEMT Process for Passive Millimeter-Wave Imaging. IEEE Access (2022).
3. A Wideband and Low-Power Distributed Cascode Mixer Using Inductive Feedback. Sensors (2022).